J. M. Barandiarán

Universidad del País Vasco / Euskal Herriko Unibertsitatea, Leioa, Basque Country, Spain

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Publications (431)772.13 Total impact

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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 · 3.24 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 · 2.73 Impact Factor
  • 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 · 1.21 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 · 2.45 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 · 2.73 Impact Factor
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    Key Engineering Materials 05/2015; 644:219-222. DOI:10.4028/www.scientific.net/KEM.644.219 · 0.19 Impact Factor
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    Andoni Lasheras · Jon Gutiérrez · Jose Manuel Barandiarán · D. A. Shishkin · A. P. Potapov
    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 · 2.19 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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    ABSTRACT: Vitrovac/PVDF laminates have been fabricated.•Size and aspect ratio effects on the ME response have been investigated.•Bi-layered and three-layered composites have been investigated•High ME response of 75 V cm−1 Oe−1 has been obtained.•The tailored ME response is suitable for sensor applications.
    Journal of Magnetism and Magnetic Materials 03/2015; 377. DOI:10.1016/j.jmmm.2014.10.040 · 2.00 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 · 2.00 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 · 2.19 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 · 1.21 Impact Factor
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    ABSTRACT: A series of amorphous polyimides and copolyimides that contained nitrile were obtained by a two-step procedure. The first step consisted of a polycondensation reaction of 4,4’-oxydiphtalic anhydride (ODPA) with one or two aromatic diamines, namely 1,3-Bis-2-cyano-3-(3-aminophenoxy)phenoxybenzene (diamine 2CN) and 1,3-Bis(3-aminophenoxy)benzene (diamine 0CN). In the second step, a thermal cyclodehydration converted each poly(amic acid) or copoly(amic acid) into their corresponding polyimide films. The piezoelectric response was improved after corona poling of the films. A maximum d33 modulus value of 16 pC N−1 was obtained for the polymide with two cyano groups (poly 2CN). The polarization also showed time and thermal stability up to 160 °C. Additionally, the thermal stability of the amorphous polyimides, (β-CN)APB/ODPA, was studied by determining the glass transition temperature (T g ) and thermal decomposition through differential scanning calorimetry (DSC) and thermogravimetric analysis (TG), respectively. The high piezoelectric response (1–16 pC N−1), T g (160–180 °C) and degradation temperature (315–450 °C) make such polyamides excellent candidates for use as high temperature sensors.
    Smart Materials and Structures 10/2014; 23(10). DOI:10.1088/0964-1726/23/10/105015 · 2.45 Impact Factor
  • Applied Surface Science 10/2014; 316:657. DOI:10.1016/j.apsusc.2014.07.089 · 2.54 Impact Factor
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    Dalton Transactions 10/2014; · 4.20 Impact Factor
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    ABSTRACT: Nanoparticle dispersion is assumed to be one of the key factors in composites performance and, in particular, for improving magnetoelectric (ME) coupling in polymer composites. To ensure a good dispersion, one of the most popular strategies is the use of surfactants, nevertheless in the case of magnetic nanoparticles-polymer composites, aspects such as the chemical and processing complexity, thermal stability, costs and health issues of such additives have severely constrained the development of upscaled applications of such composites. In this way, the dispersion of cobalt ferrite (CoFe2O4) nanoparticles in poly(vinylidene fluoride)-trifluorethylene, P(VDF-TrFE), matrix and its role in the piezoelectric, magnetic and magnetoelectric properties of the nanocomposite has been studied by preparing samples via two alternative dispersion routes: ultrasound and citric acid nanoparticle surfactation. No substantial differences have been detected in the ferroelectric, piezoelectric, magnetic and magnetoelectric response of samples prepared with and without surfactants, leading to a simplified large-scale production.
    Applied Surface Science 09/2014; 313:215-219. DOI:10.1016/j.apsusc.2014.05.187 · 2.54 Impact Factor
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    A Lasheras · J Gutiérrez · A Balza · J M Barandiarán · A Rodríguez Pierna
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    ABSTRACT: Magnetoelastic resonance measurements are carried out in short ribbons (down to 1 cm length) of Fe59Co16Si15B10 metallic glasses, both as-quenched and after annealing at 400 °C for 10 min. The resonant frequency exceeds 200 kHz with good Q factors for the shortest elements in the as-quenched state. Sandwich-type laminated magnetoelectric (ME) composites are prepared by gluing these ribbons to a PVDF piezoelectric polymer layer, showing good ME response. This effect is discussed as a function of the as-quenched or annealed state, and the length of the magnetoelastic ribbon, and is of interest for near field communication applications.
    Journal of Physics D Applied Physics 07/2014; 47(31):315003. DOI:10.1088/0022-3727/47/31/315003 · 2.72 Impact Factor
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    ABSTRACT: Mixed-metal dicyanoargentate-bridged coordination polymers of Ag(i)-Mn(ii) have been prepared and their structure and magnetic properties were determined. Reaction of manganese(ii) chloride and potassium dicyanoargentate(i) with (X)(pyridin-2-ylmethylene)isonicotinohydrazide ligands (HL(1) X = Ph, HL(2) X = Me, HL(3) X = H) produced the coordination polymer 2D-[Mn(μ-L(1))(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]n (), 1D-{[Mn(L(2))(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]CH3OH}n () and [Mn(L(3))(Cl)(μ-NCAgCN)Mn0.5(CH3OH)]n () in good yields. Trinuclear {Mn(μ-L(1))Mn(μ-L(1))Mn} and [Ag(CN)2](-) building units form a two-dimensional slab in and 1D strands in . Variable temperature magnetic susceptibility measurements showed that despite the long distance among the high spin Mn(ii) ions [10.4676(12) Å and 10.522(1) Å, for and , respectively], weak antiferromagnetic coupling takes place through the long NC-Ag-CN bridge. The best fit parameters to the model led to the magnetic coupling constant of J = -0.1 and J = -0.47 cm(-1) for and , respectively. The photoluminescence behaviour of compounds and was studied. The spectrum of compound shows a broad emission centered at about 450 nm and two excitation maxima at 270 and 310 nm.
    Dalton Transactions 06/2014; 43(31). DOI:10.1039/c4dt01390e · 4.20 Impact Factor

Publication Stats

4k Citations
772.13 Total Impact Points

Institutions

  • 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
  • 2014
    • Basque Center for Materials, Applications and Nanostructures
      Basque Country, Spain
  • 2012
    • Ikerbasque - Basque Foundation for Science
      Bilbo, Basque Country, Spain
  • 2008
    • Massachusetts Institute of Technology
      Cambridge, Massachusetts, United States
  • 1997–2008
    • University of Oviedo
      • Department of Physics
      Oviedo, Asturias, Spain
  • 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