J. M. Barandiarán

Basque Center for Materials, Applications and Nanostructures, Basque Country, Spain

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Publications (438)800.05 Total impact

  • M. Sasmaz · V.A. Chernenko · E. Martinez · P. Lázpita · J.M. Barandiarán · J. Gutiérrez · Y. Aydogdu ·
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    ABSTRACT: Martensitic structures, transformation behavior and some magnetic properties of a new series of Mn49Ni42-xFexSn9 (x = 0 – 4 at.%) metamagnetic shape memory alloys have been studied as a function of Fe content and magnetic field. Fe doping decreased sharply the martensitic transformation temperatures. The XRD patterns showed different phases including orthorhombic structure, the L21 cubic phase and the fcc γ-phase at room temperature depending on Fe content. The magnetization curves, M-H, exhibited obvious metamagnetic transitions.
    12/2015; 2:S849-S852. DOI:10.1016/j.matpr.2015.07.415
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    ABSTRACT: The detection limit of thin film giant magneto-impedance (GMI) magnetic sensors has been investigated by measuring their magnetic noise. The GMI sensing elements are multilayers based on Fe20Ni80 Permalloy (Py), deposited by sputtering and patterned by photolithography in the form of 2-mm long and 50- to 130- $mu text{m}$ wide stripes. The multilayered samples had the following structure: [Py(170 nm)/Ti(6 nm)]3/Cu(250 nm)/[Ti(6 nm)/Py(170 nm)]3. As electronic conditioning circuits, different configurations of oscillators and detectors were tested in order to determine their influence on the total output voltage sensor noise. The latter was measured using a dynamic signal analyzer and the equivalent magnetic noise of the sensor was determined through the measured Fourier transfer function of the device at the operating point. Filtering and impedance matching strategies were implemented to minimize the equivalent magnetic sensor noise. Presently, a white noise level of 120 pT/ $surd $ Hz at 2 kHz is obtained.
    IEEE Sensors Journal 11/2015; 15(11):6707-6714. DOI:10.1109/JSEN.2015.2463254 · 1.76 Impact Factor
  • Victor A L’vov · Anna Kosogor · Jose M Barandiaran · Volodymyr A Chernenko ·
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    ABSTRACT: An influence of internal stress created by the crystal defects on the magnetically induced reorientation (MIR) of martensite variants in the ferromagnetic shape memory alloy (FSMA) has been analyzed. Using the internal stress conception, a noticeable influence of the spatial reconfiguration of crystal defects on the ordinary magnetostriction of FSMA and magnetic shape memory (MSM) effect has been predicted. It has been shown that the defect reconfiguration, which stabilizes the martensitic phase during martensite aging, increases the shear elastic modulus. The increase of shear modulus reduces the magnetostriction value and in this way suppresses the MSM effect. The magneto-thermo-mechanical training of aged alloys destabilizes the martensitic phase, restores the initial magnetostriction value, and promotes the MSM effect.
    Journal of Physics D Applied Physics 10/2015; 48(39). DOI:10.1088/0022-3727/48/39/395002 · 2.72 Impact Factor
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    ABSTRACT: Composite films with filler microparticles of Barium ferrite BaFe12O19 (BaFO, 1-20 wt.%) dispersed within P(VDF-TrFE) acting as piezoelectric polymeric matrix have been prepared by solvent evaporation. SEM and TEM images in combination with magnetic measurements clearly probe the good dispersion and random distribution of the BaFO microparticles within the films. Young’s modulus of the fabricated composites remains almost unchanged for all filler contents, indicating that this acts as a small defect within the P(VDF-TrFE) matrix. On the contrary, dielectric properties clearly reduce for low filler contents, 1 and 5 wt.%, and recover and increase their values in a smooth and monotonous way for higher BaFO filler contents of 10 and 20 wt.%. This trend is not followed by the electrical conductivity. Additionally, we have extended the study to fibers composed of BaFe12O19 microparticles within a PVDF matrix. Due to the big size of BaFO particles (about 1 μm in diameter), a proper fabrication of the fiber shaped composites has not been achieved. We found that true BaFO content are always lower than nominal ones. Results are discussed in terms of the influence of size and morphology of the BaFO particles on the initial properties of the pure polymeric matrix.
    European Polymer Journal 08/2015; 69:224-231. DOI:10.1016/j.eurpolymj.2015.06.012 · 3.01 Impact Factor
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    ABSTRACT: We have developed a novel synthetic route for the preparation of single phase NdxBi1−xFe0.95Sc0.05O3 (NBFSO) nanopowder materials by a surfactant-assisted combustion-derived method. Rietveld fitting of the Powder X-ray diffraction data showed the nanopowder structure evolves from a distorted rhombohedral BiFeO3 crystalline structure (R3c, x = 0) to a orthorhombic structure (Pbnm, x = 0.10). Differential thermal analysis and thermogravimetric analysis (DTA/TGA) showed a crystallization temperature of 200 °C. Transmission electron microscopy (TEM) images revealed the presence of clusters formed by fine nanoparticles less than 60 nm in diameter. From Raman spectroscopy, the change from rhombohedral structure to cubic structure was observed by a drastic intensity reduction of the A1−2 and A1−3 Raman modes, with the A1−1 and A1−2 modes gradually merging together, indicating the merge of the orthorhombic phase. Despite the antiferromagnetic nature of bulk BiFeO3, the NBFSO nanopowders obtained displayed a ferromagnetic hysteresis loop, with coercivities of 0.08 T and remanent magnetizations of 0.65–4.05 Am2/kg when measured at room temperature. The increasing and uncompensated spins at the surface of nanoparticles and the canted internal spin by the tilt of FeO6 octahedral units and the structure transition appear to be the main reason for observed this ferromagnetic behavior.
    Journal of Alloys and Compounds 07/2015; 638(25):282-288. DOI:10.1016/j.jallcom.2015.03.102 · 3.00 Impact Factor
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    ABSTRACT: Companies and researchers involved in developing miniaturized electronic devices face the basic problem of the needed batteries size, finite life of time and environmental pollution caused by their final deposition. The current trends to overcome this situation point towards Energy Harvesting technology. These harvesters (or scavengers) store the energy from sources present in the ambient (as wind, solar, electromagnetic, etc) and are costless for us.
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    ABSTRACT: In the last years the fabrication of multifunctional composite materials like the mixture of piezoelectric polymers with magnetic/magnetostrictive nanoparticles to give as result magnetoelectric (ME) composites has received great effort [1]. P(VDF-TrFE), in the poled ferroelectric phase, exhibits one of the highest piezoelectric responses among polymer materials over a wide range of temperature depending on its composition. Among ferrites, the ferrimagnetic material barium ferrite (BaFe12O19) shows particular magnetic properties as high coercive force and hysteresis losses. Despite its very low magnetostriction (9 ppm), Barium ferrite has very high magnetocrystalline anisotropy in the low-symmetry hexagonal magnetoplumbite crystal structure with hexagonal unit cell. Although barium ferrite particles have the shape of thin hexagonal platelets, the easy direction of magnetization remains along the c axis, which is perpendicular to the plates.
    IEEE Transactions on Magnetics 07/2015; 51(11):1-1. DOI:10.1109/TMAG.2015.2446533 · 1.39 Impact Factor

  • Journal of Magnetism and Magnetic Materials 07/2015; DOI:10.1016/j.jmmm.2015.07.107 · 1.97 Impact Factor
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    Solid State Phenomena 07/2015; 233-234:225-228. DOI:10.4028/www.scientific.net/SSP.233-234.225
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    ABSTRACT: Magnetoelectric response at the radio frequency range has been studied as a function of temperature. For that purpose, we have fabricated sandwich-type laminated composites in which the Fe61.6Co16.4Si10.8B11.2 alloy was used as the magnetostrictive element and polyvinylidene fluoride (PVDF) as the piezoelectric one. The Fe61.6Co16.4Si10.8B11.2 amorphous ribbon shows good magnetic properties, with a magnetostriction close to 30 ppm and a piezomagnetic coefficient in as-quenched state and for a long ribbon of ${21.4 times 10^{-3}}$ ppm/Am $^{{ -1}}$ . Even though PVDF shows a higher piezoelectric coefficient ( ${d} _{{33}}={{15}}$ pC/N) than the high temperature poly and copolymides, the advantage of using these poly- and copolymides is the great stability shown at temperatures close to 200 °C. Considering this, the influence of temperature in laminated composites and in their components (epoxy, piezoelectric, and magnetostrictive constituents) has been measured and discussed.
    IEEE Transactions on Magnetics 07/2015; PP(99):1-1. DOI:10.1109/TMAG.2015.2390594 · 1.39 Impact Factor
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    ABSTRACT: A flexible, low-cost energy-harvesting device based on the magnetoelectric (ME) effect was designed using Fe64Co17Si7B12 as amorphous magnetostrictive ribbons and polyvinylidene fluoride (PVDF) as the piezoelectric element. A 3 cm-long sandwich-type laminated composite was fabricated by gluing the ribbons to the PVDF with an epoxy resin. A voltage multiplier circuit was designed to produce enough voltage to charge a battery. The power output and power density obtained were 6.4 μW and 1.5 mW cm−3, respectively, at optimum load resistance and measured at the magnetomechanical resonance of the laminate. The effect of the length of the ME laminate on power output was also studied: the power output exhibited decays proportionally with the length of the ME laminate. Nevertheless, good performance was obtained for a 0.5 cm-long device working at 337 KHz within the low radio frequency (LRF) range.
    Smart Materials and Structures 06/2015; 24(6). DOI:10.1088/0964-1726/24/6/065024 · 2.50 Impact Factor
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    ABSTRACT: We report two possible routes of fabrication of large surfaces of ferromagnetic shape memory antidots with tunable pore size and center-to-center distances. By using the drop coating method, we have prepared a large area of 2D arrays (typically 1cm2) of polystyrene spheres (PS) (1.4±0.1μ m diameter) on a Si substrate. We have used reactive ion etching with a gas mixture of O2 (12sccm) and Ar (5sccm) to reduce the diameter of the PS spheres whereby controlling the size of pores. The film deposition was performed on a substrate heated at 500°C (route 1) and at room temperature with subsequent annealing in a furnace at 500°C for 4 hours (route 2). Route 1 proved to be promising but more work is needed to optimize it. The antidots of Ni-Mn-Ga obtained along route 2 are ferromagnetic with a Curie temperature ~100°C, and a spread martensitic transformation (between -100°C and -30°C).
    Key Engineering Materials 05/2015; 644:219-222. DOI:10.4028/www.scientific.net/KEM.644.219 · 0.19 Impact Factor
  • P. Lázpita · J. Escolar · V.A. Chernenko · J.M. Barandiarán ·
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    ABSTRACT: Two different metamagnetic shape memory alloys of nominal composition Ni50Mn36In14 and Ni42Co8Mn39Sn11 have been studied by means of modified Arrott plots to give insight into the magnetic states of both the austenitic and martensitic phases. For Ni50Mn36In14 alloy, the same critical exponents (β = 0.32 and γ = 2.0) are obtained in austenite and martensite. They suggest that localized moments at Mn atoms are responsible for the magnetism of both phases according to the Ising model. The martensite, however, displays a rather complex behavior because β continuously changes with temperature. In Ni43Co6.5Mn39Sn11.5, critical exponents in the austenite are β = 0.27 and γ = 1.0. They are close to the tricritical mean field model, but no reliable fits were obtained in the martensite. The results are discussed in terms of microscopically different magnetic states in two alloys reflecting a complex interplay between the ferromagnetic and antiferromagnetic contributions.
    Journal of Alloys and Compounds 05/2015; 644. DOI:10.1016/j.jallcom.2015.04.232 · 3.00 Impact Factor
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    Andoni Lasheras · Jon Gutiérrez · Jose Manuel Barandiarán · D. A. Shishkin · A. P. Potapov ·
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    ABSTRACT: Fabrication of magnetoelectric laminates to be used high sensitivity sensors is a critical task and turns out to be influenced by different factors. Among them, the length of the composite (that determines the working frequency of the device) and the epoxy glue characteristics and cure process (that determines the ME signal measured at high temperatures) are of great importance. Here we present results concerning the magnetoelectric response of laminate composites fabricated with an Fe61,6Co16,4Si10,8B11,2 amorphous alloy as the magnetostrictive component and the poly-vinylidene fluoride (PVDF) polymer as the piezoelectric one. Measurements have been performed with composites ranging from 3 cm to 1 cm length and from room temperature up to 100 °C. As observed, an appropriate gluing process between magnetostrictive and piezoelectric components assures the measured magnetoelectric signal to keep constant up to about 60 °C, a temperature where the α-relaxation of the PVDF occurs and the piezoelectric response starts decaying. On the other hand, magnetoelastic resonance (working) frequencies change from 67.5 KHz for the device with L=3 cm to 215 KHz (within the radio-frequency range) for the 1 cm long one. Even for the shortest laminate, we are still able to detect some 6 V/cm.Oe at 100 °C. This makes such laminate composites suitable for high temperature and high frequency applications.
    Key Engineering Materials 05/2015; 644:40-44. DOI:10.4028/www.scientific.net/KEM.644.40 · 0.19 Impact Factor
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    ABSTRACT: Spherical and cubic exchange-coupled FeO/Fe3O4 nanoparticles, with different FeO:Fe3O4 ratios, have been prepared by a thermal decomposition method to probe anisotropy effects on their heating efficiency. X-ray diffraction and transmission electron microscopy reveal that the nanoparticles are composed of FeO and Fe3O4 phases, with an average size of ∼20 nm. Magnetometry and transverse susceptibility measurements show that the effective anisotropy field is 1.5 times larger for the cubes than for the spheres, while the saturation magnetization is 1.5 times larger for the spheres than for the cubes. Hyperthermia experiments evidence higher values of the specific absorption rate (SAR) for the cubes as compared to the spheres (200 vs. 135 W/g at 600 Oe and 310 kHz). These observations point to an important fact that the saturation magnetization is not a sole factor in determining the SAR and the heating efficiency of the magnetic nanoparticles can be improved by tuning their effective anisotropy.
    Journal of Applied Physics 04/2015; 117(17):17A337. DOI:10.1063/1.4919250 · 2.18 Impact Factor
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    ABSTRACT: The temperature evolution of the electronic structure of a Ni-Fe(Co)-Ga/MgO(100), Heusler-type, ferromagnetic shape-memory alloy thin film has been followed by a bulk-sensitive hard x-ray photoelectron spectroscopy, element-selective soft x-ray magnetic circular dichroism, and first-principles calculation. The reversible changes of the electronic states near the Fermi energy show a hysteresis associated with the martensitic phase transition (MPT), where the pseudogap opens on cooling and closes again on warming. In addition, the Ni $3d$ spin magnetic moment increases by approximately two times across the MPT, whereas the change of Fe $3d$ moment is moderate. By comparing the experimental results with the calculated spin-resolved density of states, we conclude that the band Jahn-Teller effect of Ni $3d$ and Fe $3d$ orbitals is responsible for MPT.
    Physical Review B 04/2015; 91(13). DOI:10.1103/PhysRevB.91.134417 · 3.74 Impact Factor
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    M. P. Silva · P. Martins · A. Lasheras · J. Gutiérrez · J. M. Barandiaran · S. Lanceros-Mendez ·
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    ABSTRACT: Tri-layered and bi-layered magnetoelectric (ME) flexible composite structures of varying geometries and sizes consisting on magnetostrictive Vitrovac and piezoelectric poly(vinylidene fluoride) (PVDF) layers were fabricated by direct bonding. From the ME measurements it was determined that tri-layered composites structures (magnetostrictive-piezoelectric-magnetostrictive type), show a higher ME response (75 V cm-1 Oe-1) than the bi-layer structure (66 V cm-1 Oe-1). The ME voltage coefficient decreased with increasing longitudinal size aspect ratio between PVDF and Vitrovac layers (from 1.1 to 4.3), being observed a maximum ME voltage coefficient of 66 V cm-1 Oe-1. It was also observed that the composite with the lowest transversal aspect ratio between PVDF and Vitrovac layers resulted in better ME performance than the structures with higher transversal size aspect ratios. It was further determined an intimate relation between the AreaPVDF/AreaVitrovac ratio and the ME response of the composites. When such ratio values approach 1, the ME response is the largest. In addition the ME output value and magnetic field response were controlled by changing the number of Vitrovac layers, which allows the development of magnetic sensors and energy harvesting devices.
    Journal of Magnetism and Magnetic Materials 03/2015; 377. DOI:10.1016/j.jmmm.2014.10.040 · 1.97 Impact Factor
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    ABSTRACT: NdxBi1−xFe0.95Co0.05O3 (x=0, 0.05, 0.10, 0.15) nanopowders were prepared by a combustion-derived method. The Rietvelt fitting of the X-Ray diffraction data from the NdxBi1−xFe0.95Co0.05O3 (NBFCO) powders showed nanopowders with rhombohedral BiFeO3 crystalline structure (R3c) for x≤10 and a partial structural transition to orthorhombic phase (Pnma) for x=0.15. The differential thermal analysis and thermogravimetric analysis (DTA/TGA) showed a crystallization temperature of 180 °C. Transmission electronmicroscopy (TEM) images revealed that the NBFCO nanopowders were composed of fine particles under 60 nm. From Raman spectroscopy, a band of disordered anion lattice was observed at 653 cm−1. In spite of the antiferromagnetic nature of bulk BiFeO3, the NBFCO nanopowders obtained displayed a ferromagnetic hysteresis loop, with coercivity about 0.1 T and remanent magnetization of 1.02–4.33 A m2/kg were obtained at room temperature. This ferromagnetic behavior is due to increasing and uncompensated spins at the surface and the canted internal spin by the tilt of FeO6 octahedral units. We have developed a novel synthetic route for the preparation of ferromagnetic BFO-derived nanopowder materials by a surfactant-assisted combustion-derived method.
    Journal of Magnetism and Magnetic Materials 03/2015; 377:466-471. DOI:10.1016/j.jmmm.2014.10.158 · 1.97 Impact Factor
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    V. A. L'vov · V. Golub · O. Salyuk · J. M. Barandiarán · V. A. Chernenko ·
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    ABSTRACT: Ni-Mn-Ga ferromagnetic shape memory films with similar thickness and chemical composition, deposited onto cold (with a subsequent annealing) and hot MgO(001) substrates exhibit different internal stress and structure giving rise to a different orientation of the magnetic easy axes. A quantitative theoretical analysis of the crystallographic and ferromagnetic resonance (FMR) data shows that the different anisotropies can be caused by the difference in sign between the transformation volume changes in these films, as influenced by the internal stresses. To explain FMR data, the magnetoelastic coupling term of fourth-order in the magnetic vector and linear in the strain tensor components, appearing in the Landau expansion for the free energy, is taken into account. The coefficient of the term, which couples the magnetic vector components with the volume change of the Ni-Mn-Ga alloy, was estimated to be equal to about 10(7) erg cm(-3). (C) 2015 AIP Publishing LLC.
    Journal of Applied Physics 01/2015; 117(3):033901. DOI:10.1063/1.4906097 · 2.18 Impact Factor
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    ABSTRACT: Various animals (bacteria, bees, fishes, birds, etc.) show the ability to find orientation in the geomagnetic field. This magnetoreception effect can be explained by the presence of small biogenic magnetite crystals in their organisms that interact with the geomagnetic field. Some studies carried out on rodents show that they respond to magnetic stimulation in the earth's magnetic field by the expression of activity genes like C-fos, but the mechanism of magnetoreception for them it is still unknown. In this paper, the amount of magnetite of two brains and two cerebellums of Sprague-Dawley rats was measured using ferromagnetic resonance spectroscopy. No presence of magnetite (with a limit of a few picograms) was found. This means that either biogenic magnetite is not located in the brain, but somewhere else, or that the magnetic field sensibility in rats is not related to biogenic magnetite.
    IEEE Transactions on Magnetics 01/2015; 51(1):1-3. DOI:10.1109/TMAG.2014.2347337 · 1.39 Impact Factor

Publication Stats

4k Citations
800.05 Total Impact Points


  • 2014-2015
    • Basque Center for Materials, Applications and Nanostructures
      Basque Country, Spain
  • 1982-2015
    • Universidad del País Vasco / Euskal Herriko Unibertsitatea
      • • Departamento de Electricidad y Electrónica
      • • Facultad de Ciencia y Tecnología
      • • Departamento de Física de Materiales
      • • Physical Chemistry
      Leioa, Basque Country, Spain
  • 2012
    • Ikerbasque - Basque Foundation for Science
      Bilbo, Basque Country, Spain
  • 2008
    • Massachusetts Institute of Technology
      Cambridge, Massachusetts, United States
  • 1980-2001
    • Complutense University of Madrid
      • Instituto de Magnetismo Aplicado
      Madrid, Madrid, Spain
  • 1979-2001
    • Universidad de Navarra
      Iruña, Navarre, Spain
  • 2000
    • Klinikum St. Elisabeth Straubing GmbH
      Straubing, Bavaria, Germany
    • French National Centre for Scientific Research
      Lutetia Parisorum, Île-de-France, France
  • 1990-1998
    • Universidad de Cantabria
      • Faculty of Sciences
      Santander, Cantabria, Spain
  • 1985
    • Technical University of Denmark
      Lyngby, Capital Region, Denmark