Candra Kurniawan

• Doctor of Philosophy
• Researcher at badan riset dan inovasi nasional

We report the electrochemical performance of supercapacitor electrodes made from lanthanum (La2O3)-imbued biomass-based reduced graphene oxide (rGO) composites. Integration of lanthanum at various contents (0, 0.25, 0.5, 0.75, and 1 g) with rGO was observed to appreciably improve the specific capacitance, electrical conductivity, and impedance char...

Spintronic device development relies on an understanding of magnetization dynamics in permalloy thin films, as it reveals the material’s properties and magnetization reversal mechanism through the propagation of the domain wall controlled by the external magnetic field pulse. This study explores the impact of Gaussian magnetic pulse width and heigh...

span lang="EN-US">Developing a Reduced Graphene Oxide (rGO) synthesis method based on rice husk as a composite electrode material with silica has garnered particular attention for designing high-quality electrode materials. This research successfully synthesized rGO-Si material from rice husk-derived activated carbon through a one-step thermal redu...

The focus of this study is on the Fe2O3-doped Bi0.5Na0.5TiO3-SrTiO3 piezoelectric material. This is important to find ecologically acceptable piezoelectric materials. This research aims to obtain a lead-free piezoelectric material because lead is a material that is not environmentally friendly. An alternative solution is a piezoelectric material ba...

This paper reports a new strategy (rapid and selective microwave irradiation) to achieve an improved yield of graphene-like material derived from coconut shell biomass. The influence of various microwave irradiation (MWI) powers (80, 240, and 400 W) treatment on the crystalline structures, morphology, and electrochemical performance of the produced...

Biosensors-on-chip (BoC), compact and affordable public diagnostic devices, are vital for preventing health crises caused by viral and bacterial mutations, climate change, and poor diets. Clinical, remote, and field use are possible with these devices. BoC is used in food safety, environmental monitoring, and medical diagnosis. The coupling of tunn...

Field-induced domain wall motion on thin magnetic films with perpendicular anisotropy has long been attributed with the universal creep theory, in which the domain wall (DW) is able to experience a slow-moving motion with driving fields below the depinning threshold. Despite the numerous research that has been conducted in regards to this phenomeno...

Thermal management is a very important factor in renewable energy devices that generate heat, such as fuel cells, solar cells, and lithium batteries. The cooling device of a system needs to be explored by implementing new technology, such as phase change materials (PCMs). PCMs can dissipate the heat passively due to their natural behavior of meltin...

Production of high-quality graphene at a commercial scale with low cost remains challenging. Thus, we used a high-energy ball milling approach to make reduced graphene oxide (rGO) from activated rice husks charcoal as an enriched carbon source. The as-produced rGO samples were characterized to determine the effect of various milling times (0, 50, 1...

This paper reports the improved microwave (MW) absorption characteristics of some newly prepared bio-silica-barium-ferrite composites (SBFCs) of the form (x)Bio-SiO2:(80-x)Fe2O3:(20) BaO (where x = 0, 2, and 4 wt.%). These composites were prepared using the modified solid-state reaction method with simultaneous sintering at 800 and 1100 °C. SBFCs w...

Novel multi-functional materials with very high microwave (MW) absorbance in the X-band became demanding for varied high-sensitive electronic applications. To meet this goal, a new type of activated carbon sample containing fullerene-C70 was derived from coconut shells using the combined physical activation and milling process for the first time. T...

We report our micromagnetic simulations based on Landau-Lifshitz-Gilbert (LLG) equation for CoFeB nanowire which was exposed by sub-nanosecond magnetic pulse with varied pulse width between 100 to 1000 ps. It is found that the Walker Breakdown field (HWB) shifted as the field pulse duration decreased and reached at the highest value in case of 100...

In this work, the magnetization switching time has been studied as the diameter variation of sphere-shaped ferromagnets by means of micromagnetic simulation. Some ferromagnetic elements such as cobalt, iron, nickel, and permalloy were numerically simulated with diameter size variation from 50 nm to 100 nm. The micromagnetic simulation was performed...

In this study, we have investigated the relaxed domain structure of square-shaped ferromagnets by micromagnetic simulation. The simulation was performed to some basic ferromagnetic materials such as Cobalt (Co), Iron (Fe), Nickel (Ni), and Permalloy (Py). The side length of square-shaped ferromagnets was varied from 100 to 500 nm and the thickness...

In this paper, the magnetization reversal of sphere-shaped ferromagnetic nanoparticles has been investigated by means of micromagnetic simulation. Some ferromagnetic particles such as Cobalt, Iron, Nickel, and Permalloy were modeled with size variation from 50 nm to 100 nm. The discretization of the ferromagnetic model was used a cell size of 2.5×2...

The synthesize of Nd³⁺-strontium hexaferrite magnetic material by the solid-state reaction method has been successfully carried out. This study aims to determine the effect of Nd³⁺ on the structure, magnetic properties, and microwave absorption capability of the material. Preparation of (1-x)SrO:xNd2O3:6Fe2O3 where x = 0, 10, 20, and 30 mol% using...

In this study, we have observed the domain wall (DW) propagation in CoFe and CoFeB nanowires driven by sub-nanosecond magnetic pulse using micromagnetic simulation approach. The length of the nanowire is 2000 nm, the widths are varied of 50, 100, and 150 nm, and the thicknesses are 2.5 and 5.0 nm. The simulation was performed using a rectangular ce...

In this work, hysteresis loop of CoFe and CoFeB disk ferromagnets are observed by using micromagnetic simulation OOMMF based on LLG equation. The diameter varied from 50–500 nm with the thickness 5 nm and 10 nm. For simulation process, the damping factor of 0.05 and the cell size 2.5 × 2.5 × 2.5 nm ³ were fixed. We applied parallel and perpendicula...

In this study, we have investigated magnetic hysteresis loops of squared model FePt and FePd ferromagnets by a public micromagnetic simulation based on Landau-Lifshitz Gilbert (LLG) equation. The hysteresis loops of FePt and FePd ferromagnets are generated by in-plane and out-plane applied field with respect to the size and thickness variation. It...

In this paper, the synthesis of BaFe12-2xCoxNixO19 (x = 0–0.2) materials at a calcination temperature of 950 °C using a co-precipitation method have been reported. The precursor concentrations of the mixture were varied to identify the optimum sample. The results suggested that the structure of barium hexa-ferrite crystal did not change due to the...

Some composites of barium ferrites activated with the neodymium ions (Nd³⁺) of composition (20)BaO:(80-x)γ-Fe2O3:(x)Nd2O3 (x = 0, 1 and 2 mol%) were synthesized using the modified mechanical alloying for the first time. The influence of varying Nd³⁺ concentrations on the morphologies, microstructures, and magnetic characteristics of these composite...

A series of bio-silica incorporated barium-ferrite-composites with the composition of (x)Bio-SiO2:(80-x)Fe2O3:(20)BaO, where x = 0, 1, 2, and 3 wt% were prepared using the modified solid-state reaction method. The influence of different bio-silica (extricated from sintered rice husk) contents on the surface morphologies, structures, and magnetic ch...

In this research, the effect of magnetic nano-fluids (Fe3O4) on the heat transfer enhancement in a pipe with laminar flows (Re numbers of 171, 228 and 285) were examined. Different heats (15.75 and 20.6 W) were applied to an acrylic pipe to analyse the effect of magnetic nano-fluids for transferring the heat and reducing the wall temperature on a n...

Development of technology, driving a lot of demand for materials that are cheaper, durable, and environmentally friendly for various purposes, especially in the automotive field. The most important safety feature of any vehicle is its braking system. The ability of brakes is to provide safe and repeatable stopping, which is related to safety of aut...

This study aims to determine the effect of Polyvinyl alcohol (PVA) and Soluble soybean polysaccharides (SSPS) and to characterize it (water resistance and biodegradation test). This research was done by blending (mixing) PVA, SSPS, acetic acid, and maleic anhydride. From the results of infrared spectrum analysis on plastic films showed peaks in the...

Anticipating the global trends of biodegradable plastic and its application to packaging industries, this study was conducted to prepare a seaweed (Eucheuma cottonii) based biodegradable plastic blended with polysaccharides derived from various tropical fruit seeds which are abundantly available in Indonesia such as avocado, jack fruits and durian....

In this study, we have observed the magnetic hysteresis loop of the highly anisotropic ferromagnetic materials FePt and FePd with disk model by micromagnetic simulation method based on the Landau-Lifshitz-Gilbert (LLG) equation. We used disk shaped model with varied size from 50 to 500 nm, thicknesses of 5 and 10 nm, and damping constant α = 0.05....

Utilization of topological nanostructure such as magnetic domain wall (DW) as a future generation of non-volatile memory as racetrack memory has been attracted more researchers due to potential to achieve higher speed of data read/writing and capacity. However, completed understanding of DW dynamics was still need to be improved by advanced analysi...

In this study, we investigated the domain wall propagation behavior in FePt and FePd nanowires by micromagnetic simulation based on LLG equation. A rectangular shape nanowire model was generated with a fixed length of 2000 nm and varied thicknesses of 2.5 nm and 5 nm. The wire widths were varied of 50 nm, 100 nm, and 150 nm. The 500 ps length of ma...

In this study, dynamic magnetization of square model CoFe and CoFeB ferromagnetic materials were observed using micromagnetic simulation based on LLG equation. The geometrical side size was varied from 50 to 500 nm with the thickness of 5 nm and 10 nm. For simulation process, the used damping factor was 0.05 and the cell size of 2.5×2.5×2.5 nm ³ wa...

In this paper, the effect of particle size distribution on the preparation of bonded NdFeB isotropic permanent magnets was investigated. Different particle size distribution of NdFeB powders was prepared by sieving method using standard test sieves of #100, #200, and #325 meshes. Varied distribution of particle size was mixed with 3 wt% of epoxy bi...

Pada penelitian ini, telah dilakukan analisa efek doping Mn2+/Cu2+ sebanyak 0.1%mol terhadap struktur barium heksaferit sebagai material absorbsi gelombang mikro. Sintesis material dilakukan dengan metode mechanical alloying menggunakan planetary ball mill. Powder yang telah di-milling dikalsinasi pada temperature 1000 °C selama 2 jam. Powder hasil...

Telah berhasil dibuat disain dan konstruksi turbin angin savoniuspada generator (single phase)magnet permanen NdFeB. Variasi jumlah sudu turbin masing-masing dibuat sebanyak 4, 8 dan 16 buah, dengan sumber fluida(angin) yangberasaldari turbo fan (220V/50Hz – 98W). Pada penelitian ini akan dilihat korelasi antara kecepaatan angin terhadap kecepatan...

Microwave (MW) frequency based wireless communications and electronic devices became prospective due to several ramifications. To meet this need, a series of neodymium ions (Nd³⁺) substituted barium ferrite composites with composition (20)BaO:(80–x)Fe2O3:(x)Nd2O3 (0 ≤ x ≤ 3 mol%) was prepared at 1100 °C using solid-state reaction method. We evaluat...

In this study, we have systematically calculated the dynamic susceptibility spectra of LSMO (La0.7Sr0.3MnO3) ferromagnetic nanopillars by means of a micromagnetic simulation. Simulation has been carried out for LSMO nanopillars consisted of disk and square shapes with respect to the height variation. The diameter of disk pillar and the length of sq...

The syntheses of BaFe11.6Mg0.2Al0.2O19 with calcination temperature variations of 900, 1050, and 1200 °C were conducted through a co-precipitation method to be used as Radar Absorbing Material. The raw materials used in the syntheses were: BaCl2, MgCl2, AlCl3 and natural iron sand from Kata Beach-Sumatera Barat, Indonesia. The material was characte...

In this research, the effects of the heat pipes arrangement as a passive cooling system in an electric motor for the flywheel energy storage application were analysed. Two heat pipes variations were used and attached to the outer surface of the electric motor, 4 and 6 heat pipes arrangements, respectively. The test was also compared with the condit...

In this study, the mineral material addition of FeMn and FeB to the hematite (α-Fe2O3) by varying each mass concentration of 0, 4, and 8 wt.% have been prepared by powder metallurgy method. The mixing process of the powder was done by high energy milling (HEM) for 1 h. Then, the powders were calcined at temperature of 1000 °C for 2 h. The Effect of...

Bentonite, glass bead, and Al2O3 based fine ceramics with variation of sinter temperatures (900, 1000, 1100, and 1200°C) have been prepared by powder metallurgy method. The preparation process of raw materials starts from the mixing of 35 wt% powder bentonite, 35 wt% glass bead, and 30 wt% alumina using High Energy Milling (HEM). After that, the po...

The Fabrications of MnFe2O4 have been completed using co-precipitation method with NH4OH pH variations of 11.7; 12.0; and 12.7. The iron sand and the MnCl2.4H2O powder were mixed using HCl as solvent and NH4OH as setting solution. Then the samples were dried and characterized including: morphology analysis (FE-SEM), powder density, crystal size and...

We have investigated the correlation between structural and magnetic properties of M-type BaFe12O19 thin films (∼1.4 μm) with Co-Ti (magnetic/non-magnetic) and Co-Ni(magnetic/magnetic) substitution, as BaFe12-2xCoxTixO19 and BaFe12-2xCoxNixO19 (0 ≤ x ≤ 1). With structural properties sensitively related to the magnetic properties, where ferro-ferri...

We have systematically investigated the ground state domain structure transition on magnetite (Fe3O4) material using micromagnetic simulation. A spherical model of magnetite nanoparticle was simulated with varied diameter size from 40 nm to 100 nm. It is observed that the domain structure transition from single domain to multi-domain occurred betwe...

We have investigated microwave absorbing properties of Nd2Fe14B/αFe nanocomposite prepared by melt spinning method. Structures, magnetic characteristics and microwave absorbing properties were characterized using XRD, PERMAGRAPH and Vector Network Analyzer (VNA), respectively. The complex permeability and permittivity, as well as reflection loss (R...

Iron sand is one of the natural resources in West Sumatra that has not been optimally utilized. One of the potential locations to get this iron sand deposits is the coast of Kata. This study aims to analyze the content and size of the iron grains found on the coast of Kata Padang Beach, West Sumatera Province. Coastal sand samples are extracted usi...

We have investigated the magnetic and microwave absorbing properties of barium hexaferrite BaFe12-2xCoxZnxO19 (x = 0.0; 0.2; 0.4; 0.6) nanocrystalline prepared using solid state reaction method. The powder of these ferrites were resulted by high energy ball mill for 1 h and mixed with epoxy resin to be converted into a microwave absorbing composite...

The magnetic material of Manganese Ferrite (MnFe2O4) based on natural Iron sand have been successfully prepared by using co-precipitation method. The natural Iron sand, MnCl2.4H2O, HCl and NH4OH were used as raw materials to synthesize the MnFe2O4. The synthesis was carried out at various temperatures of 70, 100 and 130°C, respectively. The physica...

Magnetic materials of magnesium ferrite (MgFe2O4) based on natural iron sand has been successfully prepared as an adsorbent of Pb ions. This material was synthesized by co-precipitation method with natural iron and Mg(CH3COO)2.4H2O as precursor powders which were mixed with 2.0 M NH4OH at a synthesis temperature of 50, 70 and 90 °C. The material ch...

Fabrication of fine ceramics based on alumina, bentonite and glass bead has been carried out by powder metallurgy. The preparation of powder has been performed using High Energy Milling (HEM) with wet milling process and using toluene as medium for 2 hours. The powder milling result was dried in oven at 100 °C for 24 hours. After that, the powder w...

In this paper, the effect of Fe-Mn alloy addition on microstructures and magnetic properties of NdFeB magnetic powders was investigated. Varied Fe-Mn compositions of 1, 5, and 10 wt% were mixed with commercial NdFeB type MQA powders for 15 minutes using shaker mill. The characterizations were performed by powder density, PSA, XRD, SEM, and VSM. The...

An adsorption method is one of the effective ways to filter the heavy metals wastes in aqueous system. In this paper, the Fe3O4/bentonite nanocomposites were successfully prepared from natural iron sand by co-precipitation method. The chemical process was carried out by dissolving and hot stirring the milled iron sand and bentonite in acid solution...

Pada penelitian ini, telah dilakukan investigasi efek aditif FeMo dan proses kalsinasi pada pembuatan magnet permanen bariumheksaferit (BaFe12O19). Proses pembuatan magnet bariumheksaferit dilakukan denganmetode mechanical alloying. Serbuk hasil mixing antara BaFe12O19dan FeMo dikalsinasi dengan variasi suhu kalsinasi 1000 oC dan 1200 oC. Karakteri...

To minimize the signal degradation, many electronic devices require efficient microwave absorbers with very low reflection-losses within the X-band. We prepared a series of trivalent neodymium-ion (Nd³⁺) substituted barium-natural ferrite using a modified solid-state reaction method. The effect of the Nd³⁺-ion content on the structure, surface morp...

Zn0.98Mn0.02O material was synthesized from ZnO and MnO2 powders using solid state reaction method. The microstructure, electrical and magnetic properties of Zn0.98Mn0.02O were studied as a function of sintering temperature. The X-ray diffraction analysis indicates that the main phase of synthesized sample is composed of hexagonal wurtzite ZnO phas...

The polymer coated Magnesium Ferrite nanoparticles (MgFe2O4) based on natural iron sand, Mg(CH3COO)2.4H2O, and PEG-6000 have been successfully prepared by co-precipitation method. The mass variation of PEG-6000 content was from 0 to 12 gram. It was prepared at synthesize temperature of 70°C. The PEG coating reduced the effect of agglomeration, so t...

The complete understanding of domain wall (DW) dynamics is important in the design of future spintronic devices. The characteristics of faster time-scale and lower current amplitude to move DW along nanowire are crucial in fabrication upgrade. In this study, we have investigated depinning behavior of magnetic domain wall triggered by nanosecond cur...

Abstrak Dalam penelitian ini telah dilakukan investigasi efek tekanan udara pada proses curing terhadap sifat fisis dan magnetik material magnet permanen bonded NdFeB. Proses sintesis bonded magnet dilakukan dengan metode compression molding dengan campuran perekat epoxy 3 wt%. Proses pencetakan dilakukan secara uniaxial dengan tekanan 200 MPa. Efe...

In the recent years, Heusler alloy has been extensively studied. Among various the Heusler alloys, Ni-Mn-Sn has gained considerable interest due to their multifunctional properties like magnetoresistance, shape memory effect and magnetocaloric effect associated with a first order phase transition martensite to austenite. In this paper, we report th...

ZnO and MnO2 powder were synthesized using solid state reaction method to produce Zn1-xMnxO materials. Effect of dopant concentrations at the material of Zn1-xMnxO (x = 0.015, 0.02, 0.025) to the change of crystal structure, electrical and magnetic properties was studied. The X-ray diffraction (XRD) result of the samples that were doped with Mn sho...

In this paper, we report on the observation of magnetic properties of polycrystalline La0.7Ba0.3MnO3 and its magnetocaloric properties. This material has been intensively studied in the recent years because this material has a high potential application. The magnetic measurement was performed by using Vibrating Sample Magnetometer (VSM) in the rang...

In this work, synthesis and characterization of a polycrystalline Ni43Mn41Co5Sn11 (NMCS) alloy are reported. Alloy preparation was conducted by melting the constituent components of the designated alloy under an inert Argon (Ar) atmosphere in a vacuum mini arc-melting furnace. Microstructure observation to the as-cast and annealed ingots showing de...

Magnetic elastomer nanocomposite based PEG-coated Fe3O4 with silicone rubber binder have been prepared from natural iron-sand by using coprecipitation method. The samples were characterized by using X-ray Diffractometer, X-ray Fluorescence, Fourier Transform Infra-Red, tensile strength test, and Vibrating Sample Magnetometer to analyze the physical...

Zn1- xCu xO (x = 0, 2, 3, and 4 at.%) was synthesized by using solid-state reaction technique. The ZnO and CuO powders were mixed and then milled by using high-speed shaker mill. The influence of Cu dopants on the structure, magnetic, and electrical properties was investigated by using XRD, VSM, and I-V and C-V measurements. The XRD analysis showed...

Zn0.95Ni0.05O has been synthesized by mixing 5% mol of NiO into ZnO using solid state reaction and high-speed shaker mill method. The samples were sintered at 900 °C with holding time for 2, 4 and 8 hours. Crystal structure, electrical and magnetic properties of Zn0.95Ni0.05O were characterized by using XRD, I-V, C-V and VSM. XRD results showed tha...

Barium hexaferrite (BaFe12O19) permanent magnets with the addition of Al2O3-MnO (0.12, 0.24; and 0.42 wt%) have been prepared by mechanical alloying method. The addition of Al2O3-MnO was done in order to improve the density and mechanical properties of the fabricated BaFe12O19 permanent magnet. Particle size of the as-mixed powder decreases Al2O3-M...

Barium Hexaferrite-based permanent magnets (BaFe12O19) was known for its high magnetic anisotropy and suitability in broad applications. Some dopants and atomic substitutions have been utilized to improve its properties for special purposes. In this paper, the Fe-Mn system was used as a dopant for preparing Fe-Mn-doped barium hexaferrite permanent...

Research in finding suitable magnetocaloric material around room temperature made ferromagnetic (FM) (Ni–Mn)-based Heusler alloys receive considerable attention as a potential candidate for the magnetic refrigerator. This compound are associated with the shape-memory effect, magnetic superelasticity, and more others magneto-functional properties. T...

The preparation of BaFe12-2xMgxAlxO19 (x = 0, 0.5, 1, and 2) of magnetic materials for microwave absorber has been done using the mechanical alloying method. BaFe12-2xMgxAlxO19 material was synthesized using BaFe12O19, MgO and Al2O3 powders. Mixing and milling processes was held using wet High Energy Milling (HEM). Sintering process was done at 120...

Magnetic nanoparticles of Fe3O4 (magnetite) have been synthesized from natural sand iron by co-precipitation method. The nanoparticles were synthesized using HCl as solvent and NH3 as co-precipitate. The nanoparticles synthesized at 70°C in two different treatments. Sample without Polyethylene Glycol (PEG) 6000 noted by A and sample with PEG 6000 n...

In this work, we have investigated the domain wall (DW) depinning behavior in the notched nanowire by a micromagnetic simulation. A transverse domain wall (TW) was initially positioned at the center of notch and 1 ns length current pulse was applied to depin the DW with respect to the notch size s and the wire width variation. We have observed the...

In this paper, the physical and magnetic properties of isotropic bonded magnet Pr-Fe-B manufactured at atmospheric and low vacuum condition were discussed. The commercials Pr-Fe-B melt spun ribbon which mixed with epoxy resin binder was used as starting materials. The compaction method was using hydraulic press of 3 grams sample (ϕ9 mm) with force...

The effects of B2O3 addition (0, 0.2, 0.5, 1 and 2 wt %) on the change of microstructure and magnetic properties of barium hexaferrite (BHF) has been made and analyzed. The purpose of this work is to higher the magnetic properties of BHF by B2O3 additive. It was found that the distribution average diameter particle, true density, sintered density,...

The effects of B 2 O 3 addition (0, 0.2, 0.5, 1 and 2 wt. %) on the change of microstructure and magnetic properties of barium hexaferrite (BHF) has been made and analyzed. The purpose of this work is to higher the magnetic properties of BHF by B 2 O 3 additive. It was found that the distribution average diameter particle, true density, sintered de...

EFFECT OF Mn-Ti IONS DOPINGAND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE. Mn-Ti doped (0, 0.1, 0.4, 0.5, and 0.6 mole%-barium hexaferrite powders have been prepared from BaCO 3 , Fe 2 O 3 , TiO 2 and MnO powder by mechanical alloying technique for 20 hours. The mixture powder were grinded and then dried at 100 °C for 24 hours, follo...

Despite of its excellence magnetic quality, one of the critical properties of PrFeB based permanent magnet is a low corrosion resistance so it can be oxidized easily which can reduce its magnetic properties. In this study, Nickel coating has been performed for bonded PrFeB magnet by the electroplating method using Nickel-Watts bath-type as the elec...

Pemilihan matriks sebagai binder dalam pembuatan magnet bonded memiliki korelasi terhadap sifat fisis dan magnet yang berkaitan dengan sifat intrinsik bahan magnet seperti temperatur kerja serta temperatur Curie. Dalam tulisan ini dibahas pengaruh variasi matriks poliester dan silicone rubber terhadap sifat mekanik dan magnet pada pembuatan magn...

Re-Fe-B (Re = Nd, Pr)-based permanent magnet has the highest energy product up to 50 MGOe, so it has a potential to be applied in various application. One of the potential application is in the electrical generator. In this research, we manufactured a rigid bonded-Pr-Fe-B permanent magnets by using a binder thermoset-bakelite (phenol formaldehyde)...

In this paper, the magnetic flux density simulations on NdFeB permanent magnets in a rotor of a generator system have been analyzed. The rotor consist of eight permanent magnets of NdFeB (rectangular shape). The simulation was done using finite element method with mesh size and precision variations. The simulation parameters were used one variation...

Magnet permanen adalah salah satu material dengan aplikasi yang luas pada berbagai macam industri di Indonesia dan merupakan material yang sangat strategis. Penguasaan teknologi produksi magnet permanen diharapkan dapat memberikan nilai tambah yang signifikan, dengan mempertimbangkan belum adanya produsen magnet permanen lokal untuk kebutuhan magne...

Salah satu aplikasi sederhana magnet permanen adalah pada alat ukur aliran air atau meter air yang salah satunya difabrikasi oleh PT. Multi Instrumentasi, Bandung. Tulisan ini membahas mengenai pengembangan magnet permanen berbasis ferrite skala industri untuk aplikasi alat meter air yang dilakukan oleh konsorsium magnet Indonesia. Magnet permanen...

Selain memiliki sifat magnet yang terbaik dibadingkan magnet permanen jenis lainnya, magnet RE-Fe-B (RE = Pr, Nd) memiliki kekurangan yaitu ketahanan korosi dan temperatur Curie yang rendah. Untuk meningkatkan ketahanan korosi magnet RE-Fe-B dapat dilakukan penambahan bahan aditif sebagai komposit atau dengan cara melapisi magnet dengan polimer ata...

Photonic crystal is a dielectric material which consists of arrangement material that has a different permittivity periodically, so it can totally reflected the propagation of electromagnetic waves (EM) with a specific frequency interval and direction, called photonic bandgap (PBG). Green tensor method can be used to calculate the total electric/ma...

Permanent magnets based on Nd-Fe-B has the advantage of the high remanences, coercivities, and high energy products compared to other types, but it also has the disadvantage which has a poor corrosion resistance. This paper discusses the nickel metal coating on a permanent magnet bonded Nd-Fe-B by electroplating method to improve the corrosion resi...

Photonic crystal is a dielectric material which has a refractive index or permittivity which vary periodically, thus preventing the propagation of light with specific frequency and direction. The frequency range is called a photonic bandgap (PBG). If the structure of photonic crystals is modified by taking one line of rod in a photonic crystal is o...

Has done research on the topic of making high-strength concrete based mikrosilika from volcanic ash of Mount Merapi. There are two treatments created, cement-concrete and polymer-concrete. The raw materials use for making this concrete is portland cement, epoxy resin (liquid), volcanic ash, fine aggregate and coarse aggregate. Concrete samples were...