Perumal Alagarsamy

• PhD
• Professor (Full) at Indian Institute of Technology Guwahati

High-performance permanent magnets play an indispensable role in manufacturing highly efficient motors and generators, ultimately contributing to the sustainability of our planet. Achieving high coercivity (μ0Hc) in hard magnetic materials at or above room temperature without relying on heavy rare-earth elements remains a challenge. Effective strat...

Soft magnetic films play a crucial role in numerous technological applications, such as magnetoelectronics, telecommunications, and magnetic recording, and the tuning of properties to obtain high-efficiency demands searching new materials and controlling thickness and compositions. In this regard, we report a systematic investigation of structural,...

The primary objective of this study is to unravel the role of Ag+ ions in A-site substitutions and to explore their potential in achieving room-temperature magnetocaloric response. The investigation is structured around three distinct scenarios: direct Ag+ substitution, Ag+ introduction as a composite, and the absence of Ag+ as an A-site deficient...

The study of exchange bias in various types of systems received great attention due to widespread applications in numerous magnetoelectronic devices and, in particular, understanding and controlling exchange bias in single layer films becomes crucial in advancing the spintronics field. With this connection, we here present a study on the origin of...

Humidity sensors using triboelectric nanogenerator (TENG) technology can provide continuous operation without the need for additional batteries. These sensors provide sustainable and self-powered humidity monitoring solutions, which can be utilized in various agriculture, industries, and food processing industries. In this work, a sol-gel method is...

The spent catalysts discarded during chemical manufacturing can be a source of pollution and classified as hazardous waste. Looking at the bright sides of the mission of waste management, such as recycling, reducing, reuse such types of the spent catalyst can be chemically treated to extract valuable salts and metals. Such a process not only reduce...

Lead-free piezoelectric ceramic is a promising material for energy harvesters, as they have superior electromechanical, ferroelectric, and piezoelectric properties. In addition, piezoelectric ceramics can be blended with polymer to achieve high-flexibility polymer-ceramic composites, providing mechanical robustness and stability. In this context, a...

Triboelectric nanogenerator (TENG) has recently attracted extensive attention from academics and industries as a promising approach for energy harvesting. This work entails a detailed study of the NiO-Ti reduction process to synthesize NiO-Ni-TiO2 nanocomposites and executes structural, spectroscopic, and magnetic properties to unveil a well-nigh N...

Triboelectric nanogenerators (TENG) is an effective approach for the development of self-powered systems, as it offers several flexibilities, such as wide material choice, high power density, simple fabrication process, etc. In this present work, the zeolite imidazole framework (ZIF-8) is synthesized by two approaches: solvent-assisted (SA) and sol...

We report a systematic analysis of transport properties, microstructure and atomic order in the thin films of the CoFeCrAl (CFCA) quaternary Heusler alloy that was predicted to be a spin-gapless semiconductor (SGS). Scanning transmission electron microscopy (STEM) observations revealed that the CFCA films in the as-deposited state and the one annea...

This work presents the mechanochemical synthesis of ferromagnetic NiO-Ti-based nanocomposites and exploits them as a positive triboelectric layer to enhance the performance of a triboelectric nanogenerator (TENG). Magnetization and charge polarization play crucial roles in augmenting the triboelectric performance. Various physicochemical properties...

This study presents a systematic investigation on the NiO-Mg mechanochemical reduction process to form in-situ ferromagnetic NiO-Ni-MgO nanocomposites and utilize them as positive triboelectric layers in the fabricated triboelectric nanogenerator (TENG) devices for harvesting biomechanical energy in real-life applications. The structural and micros...

This study presents a multiunit hybrid piezo-triboelectric nanogenerator (HNG), utilizing both the triboelectric and piezoelectric effects, constructed from Bismuth Titanate, Bi4Ti3O12 (BiTO) / polydimethylsiloxane (PDMS) composite films through a simple and cost-effective fabrication technique. The BiTO samples synthesized by a mixed oxide route c...

Any degree of surface roughness could play a significant role in determining the optical properties of ultra-thin films required for epsilon-near-zero (ENZ) applications. In this report, we have provided a systematic analysis of the evolution of an ENZ mode with increasing surface roughness values and established both experimentally and theoretical...

In this paper, detailed studies of structural, electrical, and magnetic characteristics of a double perovskite lanthanum iron manganate (La2FeMnO6) have been reported. From the Rietveld analysis of X-ray diffraction data and pattern, the orthorhombic structure of the compound has been determined. The least-squares refined lattice parameters of the...

In article number 2101829, Sitansu Sekhar Nanda, Hoe Joon Kim, and co-workers demonstrate the application of cyclodextrin metal–organic framework (CD-MOF), a green multifunctional material, to the electrifying layer of a multi-unit triboelectric nanogenerator. The developed device exhibits outstanding power outputs along with stable operation. The...

Giant magnetoresistance (GMR) devices known for their widespread application as magnetic field sensors face challenges owing to their nonlinear resistance response with the magnetic field. Here, we have developed CoFe(3 nm)/ Rh(tRh nm)/ CoFe(tmidCoFe nm)/ bcc Cu(1.6 nm)/ CoFe(ttopCoFe nm)/ MgO(2 nm) based current in plane (CIP)-GMR devices and demo...

The naturally available cyclodextrin has opened up a wide range of research avenues because of its superior characteristics such as being non‐toxic, biocompatible, and edible. The cyclodextrin is the green multifunctional material that can add to the triboelectric series and extend its self‐powered applications. The ultrasonic synthesized cyclodext...

Large magnetoresistance (MR) with a linear response to the magnetic field is an important feature in MR devices for magnetic sensor applications. Following the largest MR ratio realized in a current-in-plane (CIP) giant magnetoresistance (GMR) device using a metastable body-centered cubic (bcc)-Cu spacer, we developed a new CIP-GMR device with a co...

We investigate the strain evolution, phase formation and ferromagnetism of nanocrystalline TiO2 powders prepared by high energy planetary ball milling technique. Pure TiO2 shows the anatase phases in the structural analysis and more than 0.25 h of milled powder turns into Rutile and Magneli phases. The crystallite size and strain were calculated fr...

We report the room temperature ferromagnetism in Zn-doped NiO nanoparticles of Ni1−x ZnxO (x = 0.00, 0.01, 0.03, 0.05 and 0.1) prepared by the sol-gel method. Zn dopant has significant influence on structural, optical, and magnetic properties of NiO crystal when there is a size reduction and lattice distortions. The crystalline nature of the sample...

We report the study of the effects of processing parameters and additive concentration on the structure, microstructure and microwave dielectric properties of MTO–CeO2 (x wt.%) ceramics with x = 0, 0.5, 1.0 and 1.5 prepared by solid-state reaction method by adding CeO2 nanoparticles as a sintering aid. The pure Mg2TiO4 ceramics were not densifiable...

We present systematic investigations of tuning magnetic anisotropy, domain structure, magnetic, structural and electrical transport properties of Fe1-xNix thin films. All the films were prepared by DC magnetron sputtering directly on Si (100) substrate maintained at different substrate temperatures (TS). Fe1-xNix films deposited at ambient temperat...

We investigate the defects induced magnetic properties of NiO nanocrystals prepared by mechanical alloying ball milling process. The average crystallite size reduces to ∼12nm after 40 hours of milling but the face centered cubic structure is stable both in pure and milled NiO powders. The unmilled pure NiO is anti-ferromagnetic in nature, whereas t...

We investigate defect-induced electronic and magnetic properties of zinc oxide (ZnO) nanocrystalline powders prepared by mechanical milling. The average crystallite size decreases as the milling time is increased but the wurtzite structure is stable even after 60 hours of milling. The structural properties are characterized by X-ray diffraction and...

A detailed study of mechanochemical (MC) processing of NiO-Ti [NiO-Ti (x at.%) with x = 20, 35] powders was carried out by using high-energy ball milling technique, and the formation of a NiO-based nanocomposite was investigated as a function of milling time. During milling, NiO reduction into Ni follows a gradual process with a reduction of 10% an...

We report a detailed structural, vibrational, and magnetic properties of mechanically alloyed NiO-(Mg,Ti) (x at.%) [xMg = 0 – 50 and xTi = 0 – 35] powders prepared using high-energy planetary ball mill under dry milling condition. Structural studies not only reveal a large crystallite size reduction during milling, but also illustrate an in-situ me...

We report a detailed structural, vibrational, and magnetic properties of mechanically alloyed NiO-(Mg,Ti) (x at.%) [xMg = 0 – 50 and xTi = 0 – 35] powders prepared using high-energy planetary ball mill under dry milling condition. Structural studies not only reveal a large crystallite size reduction during milling, but also illustrate an in-situ me...

We report a detailed analysis of microstructure, magnetic and transport properties of a stoichiometric Mn2CoAl Heusler alloy, which has been predicted to be a spin-gapless semiconductor (SGS). Microstructure analysis revealed that the main phase was Mn1.8Co1.4Al0.8 rather than Mn2CoAl; this stable compound remained even for a Co-rich composition. A...

We report thickness dependent magneto-static and magneto-dynamic properties of amorphous Co40Fe40B20 (a-CoFeB) films with thickness, t = 10 – 200 nm deposited on thermally oxidized Si substrate using magnetron sputtering technique at ambient temperature. Magnetic hysteresis loops of films with t <= 20 nm transformed from rectangular or flat type sh...

We report thickness dependent thermal oxidation in Ni (t = 10 – 300 nm) thin films exposed to air annealing and the resulting vibrational, magnetic and electrical properties of Ni films deposited directly on thermally oxidized Si substrate using magnetron sputtering technique at ambient temperature. As-deposited Ni films exhibit face-centered cubic...

We report systematic investigation of thickness dependent surface topography, magnetic properties and magnetic domain structures of amorphous Fe80Ta8C12 (x nm) films with x=5–100 nm. All the as-deposited films fabricated directly on thermally oxidized Si substrate at ambient temperature using magnetron sputtering technique exhibit amorphous structu...

We report the study of interlayer coupling between Co20Fe60B20 (CoFeB262) layers and the resulting magnetic properties of trilayer [CoFeB262 (y nm)/ Cr (x nm)/ CoFeB262 (20 nm)] films with symmetric (y=20) and asymmetric (y=100) structures. All as-deposited CoFeB262 films exhibit amorphous structure. Surface topography studies display clear and uni...

This study deals with tuning magnetic properties of a thick amorphous (a-)Co20Fe60B20 (CoFeB262) film by using interlayer magnetic coupling in trilayer structured films of [CoFeB262 (100 nm)/[Cr,Ta (x nm)]/ CoFeB262 (y nm)] with y = 2-50, xCr = 0.75, 2 and xTa = 1, 4. All the films are deposited directly on thermally oxidized Si substrate at ambien...

The effect of composition variation of (Ba1-xGdx)(Ti1-xFex)O3 (0.2 ≤ x ≤ 0.5) on structural, optical, electrical and multiferroic properties was investigated. The polycrystalline samples were fabricated by a chemico-thermal route. While the compound with composition x ≤ 0.3 has a tetragonal structure akin to BaTiO3, the higher compositions (x > 0.3...

We report a novel approach for tuning the magnetic properties of stripe domain structured amorphous Co40Fe40B20 (CoFeB) films by using stack structured [CoFeB (100 nm)/Ta (z=0-1.5 nm)]n=0-4/CoFeB (100 nm) films with spacer layer thickness dependent interlayer coupling. All the as-deposited films deposited directly on thermally oxidized Si substrate...

We report the effect of oxidation on the structural, vibrational, magnetic and electrical properties of Fe thin filmsdeposited at ambient temperature directly on silicon substrate using magnetronsputtering technique and post annealed (TA) under air atmosphere. The structural and vibrational properties reveal that as-deposited film and the filmannea...

We report the mechanically activated aluminothermic reduction of NiO [NiO-Al(x wt.%) with x = 0,20,40] into NiO-Ni-Al2O3 nanocomposites using high-energy planetary ball milling under dry milling and the resulting structural and magnetic properties. Structural studies reveal that both NiO and NiO-Al powders exhibit face centered cubic structure with...

We report the magnetic and dielectric properties of single phase samples of orthorhombic YFe1-xMnxO3 (x = 0.0–0.3). The Néel temperature is found to decrease from 646 K for x = 0 to 428 K for x = 0.3 due to the weakening of superexchange interaction upon Mn3+ substitution. In addition, Mn substitution induces spin re-orientation transition and the...

We report composition, thickness and temperature dependent magnetic properties of amorphous Co80-yFeyB20 (x nm) films with y=40,60 and x=7–200 nm prepared directly on thermally oxidized Si substrate using magnetron sputtering technique. All the as-deposited films exhibit amorphous structure. For both the compositions, the shape of magnetic hysteres...

We report systematic investigations of thickness dependent magnetic properties of amorphous Co40Fe40B (x nm) single-layer films and effects of number of multilayers and thickness of spacer layer on the magnetic properties of multilayer structured [Co40Fe40B (y nm)/Ta (z nm)]n=1-3/ Co40Fe40B (y nm) films prepared directly on thermally oxidized Si su...

Single-phase samples of orthorhombic YFe1−x Mnx O3 (x = 0 to 0.3) were prepared using solid-state route. Temperature variation of magnetization measurements show antiferromagnetic transition with Néel temperature (T N) in the range of 646 K for x = 0 to 456 K for x = 0.3. Spin canting-induced weak ferromagnetism is observed for T < T N. These mater...

We report effects of annealing and substitution of Al on structural and magnetic properties of nanocrystalline Fe80-xAlxCo5Si15 (x = 0 – 10) alloy powders prepared by mechanical alloying process using a planetary ball mill technique. All the as-milled powders exhibit non-equilibrium solid solution of α-Fe(Si,Co,Al). While the average size of crysta...

We report the effects of film thickness, annealing temperature and annealing environments on thermal decomposition behavior and resulting magnetic properties of NiO (t=50–300 nm) thin films. All the NiO films were prepared directly on thermally oxidized Si at ambient temperature using magnetron sputtering technique and post annealed at different te...

We report systematic investigations on temperature dependent magnetic coupling between ferromagnetic FeTaC layers and resulting magnetic properties of multilayer structured [FeTaC (~67 nm)/Ta(x nm)]2/FeTaC(~67 nm)] thin films, which are fabricated directly on thermally oxidized Si substrate. As-deposited amorphous films are post annealed at differe...

We report systematic studies on the effects of heat treatment, the number of multilayers and temperature on interlayer coupling dependent magnetic properties in amorphous and nanocrystalline ([FeTaC(y nm)/Ta(1 nm)](n=1-4)/FeTaC(y nm)/substrate) multilayer structured thin films fabricated directly on thermally oxidized Si substrate at ambient temper...

Magnetic anisotropy, spin wave (SW) excitation and exchange stiffness constant of amorphous FeTaC (d = 20-200 nm) films were studied as a function of thickness using micro-strip ferromagnetic resonance (MS-FMR) technique. The MSFMR spectra for in-plane applied magnetic field show the presence of uniform precessional mode (n = 0) along with first pe...

The optimization of nanogranular FePt-C films for heat-assisted magnetic recording is carried out by varying processing conditions for compositionally graded sputtering. Microstructures and magnetic properties of the films were studied for various thicknesses ranging from 2 to 12 nm to observe the growth steps of the films. An excellent in-plane na...

Magnetic anisotropy, spin wave (SW) excitation and exchange stiffness constant of amorphous FeTaC ($d$ = 20-200 nm) films were studied as a function of thickness using micro-strip ferromagnetic resonance (MS-FMR) technique. The MS-FMR spectra for in-plane applied magnetic field show the presence of uniform precessional mode ($n$ = 0) along with fir...

We report systematic studies on the effect of heat treatment and spacer layer thickness (x) on structural and temperature dependent magnetic properties of laminated [FeTaC (50 nm)/Ta (x nm)]3/FeTaC (50 nm) thin films. All the films were deposited directly on oxidized Si substrate using magnetron sputtering technique at ambient temperature and post...

The 3rd International Conference of Asian Union of Magnetic Societies (IcAUMS 2014) was held in Haikou, China, from October 28 to November 2, 2014 and this biennial conference was the third one in the IcAUMS series. The original founding conference was held at Jeju, Korea, in 2010, followed by the 2nd IcAUMS at Nara, Japan, in 2012. The IcAUMS is A...

Systematic investigations for the optimization of FePt-C nanogranular films for heat assisted magnetic recording (HAMR) media are overviewed. FePt-C films prepared using compositionally graded process exhibit binomial distribution of grains with a maximum size distribution of 16 %. In addition, the average grain size of FePt could be controlled wel...

We report systematic investigations of structural, vibrational, resonance and magnetic properties of nanoscale NiO powders prepared by ball milling process under different milling speeds for 30 hours of milling. Structural properties revealed that both pure NiO and as-milled NiO powders exhibit face centered cubic structure, but average crystallite...

We report the structural and magnetic properties of nanocrystalline Fe100-x-yCoySix (x = 10, 15, y = 0 – 20) alloy powders prepared by mechanical alloying process in a planetary ball mill. All the as-milled powders exhibit non-equilibrium α-Fe(Co,Si) solid solution with average crystallite size of 7 to 11 nm. The lattice constant increases initiall...

Perpendicular magnetic anisotropy (PMA) and low magnetic damping are the key factors for the free layer magnetization switching by spin transfer torque technique in magnetic tunnel junction devices. The magnetization precessional dynamics in soft ferromagnetic FeTaC thin film with a stripe domain structure was explored in broad band frequency range...

We report the effect of Ta underlayer on the structural and the magnetic properties of Permalloy (Ni81Fe19) thin films over a wide range of film thicknesses (tNi–Fe = 10–200 nm). For this purpose, Ta (5 nm)/Ni–Fe (tNi–Fe nm)/Ta (2 nm) films were grown on thermally oxidized Si substrates under the presence and the absence of biasing magnetic field (...

We report the effect of Ta underlayer on the structural and magnetic properties of Permalloy (Ni81Fe19) thin films over a wide range of film thicknesses (tNi-Fe = 10– 200 nm). For this purpose, Ta (5 nm)/Ni-Fe (tNi-Fe nm)/Ta (2 nm) films were grown on thermally oxidized Si substrates under the presence and absence of biasing magnetic field (1000 Oe...

We have investigated critical behaviour and magnetocaloric effect in polycrystalline Ni50Mn35In14Si1 alloy near the second-order ferromagnetic phase transitions (SOPT) at austenite Curie temperature (TC,A) and at martensite Curie temperature (TC,M) by determining the critical exponents, β, γ and δ corresponding to the temperature dependence of spon...

We report a systematic investigation of temperature dependent magnetic properties of FePt single and FePt(30)/M/Fe(5) nanocomposite thin films prepared by sputtering technique on low cost substrates at ambient temperature and post annealed at different temperatures. With increasing annealing temperature, L10 ordering, hard magnetic properties and t...

We report a systematic investigation of structural and magnetic properties of Mn-rich off-stoichiometric nano-crystalline Ni 48.84Mn 37.96 Sn13.20 ferromagnetic shape memory alloy thin films, grown on Si (100) substrates at ambient temperature by dc magnetron sputtering. As-deposited films were amorphous in nature. Crystallization was induced progr...

We report the effect of Al and Cr substitution on structural and magnetic properties of fine Fe80-xMxSi15Co5 (M=Al,Cr; x=0-10) powders with nanocrystalline microstructure prepared by high energy ball milling. All as-milled powders exhibit non-equilibrium solid solutions within 40 h of milling. Average crystallite size (D) decreases from 11 to aroun...

We report structural, vibrational, optical and temperature dependent magnetic properties of NiO nanoparticles prepared by a sol-gel process with different particle sizes and molar concentrations. The structural properties reveal that NiO nanoparticles have single phase face centred cubic structure with negligible strain and without any detectable i...

Magnetic materials play a vital role in technologies ranging from those concerning the day-to-day life of man to special applications in nuclear, space, defense and health sectors. Despite several notable developments in theoretical and experimental fronts in the area of magnetism and magnetic materials and the ever increasing number of researchers...

We report the investigation of crystal structure, magnetic and dielectric properties of BaTi1−xFexO3 samples for x=0.0-0.3. The parent compound is found to crystallize in tetragonal structure while Fe doped samples are found to crystallize in the mixture of tetragonal and hexagonal phases but they are free from any impurity phase. Room temperature...

We report systematic investigations of microstructure and temperature dependent magnetic properties of amorphous Fe60-xMnxZr35B5 (0 ≤ x ≤ 20) powders prepared by mechanical alloying process. All the as-milled powders exhibit amorphous structure. Refinement of microstructure and reduction in effective anisotropy with increasing Mn content causes a l...

The magnetization as a function of field and temperature has been measured for a series of amorphous Fe90-xMnxZr10 alloys with x=0–12 in the temperature range 4.2–300 K. All the samples of the present study show double transition (reentrant) behavior below room temperature. The high-temperature transition (Tc) decreases linearly at about 6 K/at. %...

We have systematically investigated the effect of particle size on the magneto-caloric properties of Ni51Mn34In14Si1 alloy. Arc melted Ni51Mn34In14Si1 alloy was milled to reduce the average particle size and then vacuum annealed to reduce the strain accumulated in the particles during milling. Annealed particles were sieved and magneto-caloric para...

Change in entropy (Delta S) has been estimated at the first order martensitic transition in selected Ni-Mn-X (Ga, Sn, and In) based ferromagnetic shape memory alloys (FSMAs). During the first-order martensitic structural phase transition, discontinuity in entropy leads to a large Delta S. Delta S can be estimated from differential scanning calorime...

We report the investigation of crystal structure, magnetic and dielectric properties of BaTi 1 À x Fe x O 3 samples for x ¼0.0–0.3. The parent compound is found to crystallize in tetragonal structure while Fe doped samples are found to crystallize in the mixture of tetragonal and hexagonal phases but they are free from any impurity phase. Room temp...

We report systematic investigations on the evolution of nanostructured ZnO, room temperature ferromagnetism, and tunable optical properties of ZnO nanoparticles prepared by a mechanical alloying process. It was observed that both un-milled and as-milled powders exhibited a wurtzite structure, but average crystallite size decreased and the effective...

Multilayer films were sputtered on Si (100) substrate by following a layer sequence of Cr (10 nm)/[Fe (4 nm)/SmCo5 (20 nm)](11)/Cr (90 nm) at room temperature and subsequently, subjected to two-stage annealing. The phase composition, the extent of inter-diffusion at the SmCo5/Fe interfaces and the magnetic properties of multilayered samples were in...

We report the structural and temperature dependent magnetic properties of Fe100-xSix (0 <= x <= 40) alloy powders synthesized by a mechanical alloying process over a wide composition range. We have observed from X-ray diffraction (XRD) that non-equilibrium solid solution could be obtained up to 35 at% Si within 100 h of milling. As-milled powders h...

We report a systematic investigation on crystal structure, microstructure, and microwave dielectric properties of (Mg1−xCox)TiO3 (x = 0–0.07) ceramics prepared by semialkoxide precursor method. All the as-made samples exhibit an ilmenite structure with an incredible reduction in sintering temperature from 1350°C to 1200°C. Lattice parameter increas...

We report the structural and temperature dependent magnetic properties of Fe 100 À x Si x (0 rx r 40) alloy powders synthesized by a mechanical alloying process over a wide composition range. We have observed from X-ray diffraction (XRD) that non-equilibrium solid solution could be obtained up to 35 at% Si within 100 h of milling. As-milled powders...

We report systematic investigations on structural, magnetic and optical properties of NiO nanoparticles prepared by mechanical alloying. As-milled powders exhibit face centred cubic structure, but average particle size decreases and effective strain increases for the initial periods of milling. Lattice volume increases monotonically with a reductio...

Magnetic hysteresis loss and the resulting local heating in implanted thermoseed (magnetic biocompatible material) can be used to selectively destroy cancerous tissue. We have prepared magnetic bioglass ceramics (MBC) by annealing 41CaO44 SiO24P2O58Fe2O33Na2O glass at temperatures (TA) ranging from 750 C to 1150 C for 1 h. X-ray diffraction p...

We report a systematic investigation on room temperature and temperature dependent magnetic properties of [${{{rm Fe} hbox{-} {rm Ta} hbox{-} {hbox{C}} ( {rm y} )/{rm Ta}( {{1}~hbox{nm}} )} ]_{{rm n} = {0}-{4}}}/{rm FeTaC}( {rm y} )/{rm substrate}$] films prepared on thermally oxidized Si substrates at ambient temperature and postannealed at differ...

The authors report the investigations of effects of milling and composition on the evolution of nanocrystalline microstructure and magnetic properties of Fe100-xSix (0 <= x <= 40) alloy powders synthesized by high energy ball milling over a wide composition range. We have observed from X-ray diffraction that a nonequilibrium solid solution could be...

We report the effects of thickness of spacer layers and temperature on the magnetic properties of multilayer structured [FeTaC(50 nm)/Ta(x nm)]n=3/FeTaC(50 nm)/substrate amorphous thin films. A transcritical loop with a large coercivity (HC) of 25 Oe was observed for x = 0 film, but the loop shape was changed to flat loop along with a rapid decreas...

We report the investigation of temperature dependent magnetic properties of FePt and FePt(30)/M(Cu,C)/Fe(5) trilayer thin films prepared by using magnetron sputtering technique at ambient temperature and postannealed at different temperatures. L 1 0 ordering, hard magnetic properties, and thermal stability of FePt films are improved with increa...