J. M. Barandiarán

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

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Publications (409)658.74 Total impact

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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. · 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. · 2.00 Impact Factor
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    Dalton Transactions 10/2014; · 4.10 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). · 2.02 Impact Factor
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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. · 2.53 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; · 4.10 Impact Factor
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    ABSTRACT: Recoverable strains have been measured in a single-crystalline Ni–Fe(Co)–Ga shape memory alloy in the course of tensile tests performed at different temperatures. Two substantially different types of deformation process were observed above the martensitic transformation temperature, TM ≈ 200 K. An unusual anhysteretic stress–strain behavior characterized by an enormous (∼14%) nonlinear deformation was found above 320 K, while stress–strain loops showing a pronounced hysteresis were obtained below this temperature. A sudden reduction of hysteresis was explained using the theoretical stress–temperature diagram of ferroelastic phase transitions. It has been shown that this almost anhysteretic deformation can occur when the temperature of the deformed alloy exceeds the critical value corresponding to the endpoint of the phase transition line in the phase diagram. A theoretical analysis showed that above the critical temperature a very small residual hysteresis (∼1 MPa) may be caused by the reconfiguration of crystal defects during the deformation cycle.
    Acta Materialia 03/2014; 66:79–85. · 3.94 Impact Factor
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    ABSTRACT: The low electron concentration region (e/a < 7.75) of the magnetic phase diagram of the off-stoichiometric Ni–Mn–Sn Heusler alloys was investigated in detail by DSC and magnetization measurements of the Ni40+xMn39−xSn21(x = 0, 2, 4, 6 and 8 at.%) alloys. The alloys show a stable austenitic phase without any martensitic transformation down to 5 K even after heat treatment. The Curie temperature exhibits a broad maximum over a large composition range. The evolution of the magnetic moment with the electron concentration fits the data of previous studies and confirms the peak-like dependence in the extended range of e/a values predicted by ab initio calculations. The explored part of the moment versus e/a curve can be explained in terms of a localized magnetic moment model and full atomic order in the alloys.
    Journal of Alloys and Compounds 01/2014; 594:171–174. · 2.73 Impact Factor
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    ABSTRACT: The outstanding properties of selected soft magnetic materials make them successful candidates for building high performance sensors. In this paper we present our recent work regarding different sensing technologies based on the coupling of the magnetic properties of soft magnetic materials with their electric or elastic properties. In first place we report the influence on the magneto-impedance response of the thickness of Permalloy films in multilayer-sandwiched structures. An impedance change of 270% was found in the best conditions upon the application of magnetic field, with a low field sensitivity of 140%/Oe. Second, the magneto-elastic resonance of amorphous ribbons is used to demonstrate the possibility of sensitively measuring the viscosity of fluids, aimed to develop an on-line and real-time sensor capable of assessing the state of degradation of lubricant oils in machinery. A novel analysis method is shown to sensitively reveal the changes of the damping parameter of the magnetoelastic oscillations at the resonance as a function of the oil viscosity. Finally, the properties and performance of magneto-electric laminated composites of amorphous magnetic ribbons and piezoelectric polymer films are investigated, demonstrating magnetic field detection capabilities below 2.7 nT.
    Sensors 01/2014; 14(5):7602-24. · 2.05 Impact Factor
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    ABSTRACT: The martensitic transformation (MT) of metamagnetic shape memory alloys is very sensitive to the applied magnetic field and atomic order. We analyze the alloy Ni50Mn34.5In15.5 in magnetic fields up to 13 T. The alloy has been prepared both in an ordered state by slow cooling, and in a disordered state by rapid quenching. In both cases the dependence of the martensitic transition temperature on the field is highly nonlinear. Such departure from linearity is due to a decrease of the entropy change at the transition, ΔS, with the applied field. This can be explained by the ordering effect of the magnetic field on the frustrated magnetic structure of the alloy in the martensitic phase. Compliance with a recent model, relying on the strong magnetoelastic interactions in these compounds, is very satisfactory.
    Journal of Physics Condensed Matter 11/2013; 25(48):484005. · 2.22 Impact Factor
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    ABSTRACT: The effect of the bonding layer type and piezoelectric layer thickness on the magnetoelectric (ME) response of layered poly(vinylidene fluoride) (PVDF)/epoxy/Vitrovac composites is reported. Three distinct epoxy types were tested, commercially known as M-Bond, Devcon and Stycast. The main differences among them are their different mechanical characteristics, in particular the value of the Young modulus, and the coupling with the polymer and Vitrovac layers of the laminate. The laminated composites prepared with M-Bond epoxy, exhibit the highest ME coupling. Experimental results also show that the ME response increases with increasing PVDF thickness, the highest ME response of 53 V.cm-1.Oe-1 being obtained for a 110 µm thick -PVDF/M-Bond epoxy/Vitrovac laminate. The behavior of the ME laminates with increasing temperatures shows a decrease of more than 80% in the ME response of the laminate, explained by the deteriorated coupling between the different layers. A two dimensional numerical model of the ME laminate composite based on the finite element method was used to evaluate the experimental results. Comparison between theoretical and experimental data allows to select the appropriate epoxy and to optimize the piezoelectric PVDF layer width to maximize the induced magnetoelectric voltage. The obtained results show the critical role of the bonding layer and piezoelectric layer thickness in the ME performance of laminate composites.
    ACS Applied Materials & Interfaces 10/2013; · 5.90 Impact Factor
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    ABSTRACT: Lattice instability of off-stoichiometric Ni-Mn-Ga based ferromagnetic shape memory alloys with different valence electron concentrations (e/a’s) has been studied by utilizing hard X-ray photoelectron spectroscopy. Comparison of two alloys with different e/a’s suggests that a rigid band model is not applicable to explain the different martensitic transition temperatures. It is revealed that the specimen with larger e/a shows larger density of the Ni 3d eg states near the Fermi energy compared to specimen with lower e/a. The results can be reasonably explained by the band Jahn-Teller effect.
    Applied Physics Letters 08/2013; 103(7). · 3.52 Impact Factor
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    ABSTRACT: It is generally accepted that the martensitic transformations (MTs) in the shape memory alloys (SMAs) are mainly characterized by the shear deformation of the crystal lattice that arises in the course of MT, while a comparatively small volume change during MT is considered as the secondary effect, which can be disregarded when the basic characteristics of MTs and functional properties of SMAs are analyzed. This point of view is a subject to change nowadays due to the new experimental and theoretical findings. The present article elucidates (i) the newly observed physical phenomena in different SMAs in their relation to the volume effect of MT; (ii) the theoretical analysis of the aforementioned volume-related phenomena.
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    Dataset: IEEE2002imp
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    ABSTRACT: Ferromagnetic shape memory alloys (FSMAs) represent a new type of multifunctional smart materials that exhibit a giant magnetostrain effect, MSE, (10% in a field lower than 1 T) alongside the ordinary shape memory effect and superelasticity. These appear as a result of magnetically driven twin variant reorientation in the tetragonal or orthorhombic martensitic phase or thermally / stress/magnetic field- induced martensitic transformation (MT). In this work, we will present the details of thin film technology of FSMAs developed at UPV/EHU. A magnetron DC sputtering of the in-house fabricated Ni-Mn-Ga targets on heated at 500 C substrates is used to facilitate a formation of 5M- or 7M-martensitic phases in the films at room temperature. Sputtering parameters like power, Ar pressure and substrate temperature were optimized to obtain the desired composition and proper microstructure. The transformation characteristics and functional properties of the prototype thin films (typically 1 micron-thick) epitaxially grown on MgO(100) were studied by XRD, thermomagnetization and resistivity curves, AFM/MFM and dynamical mechanical analysis (DMA). Design and fabrication of freely movable Ni-Mn-Ga microstructures for micro-scale actuation was probed by using arrays of Ni-Mn-Ga/Si(100) cantilevers with a different aspect ratio prepared by using electron beam lithography (EBL), ion beam etching (IBE) and a Cr based sacrificial layer technology. The first results of their mechanical and magneto-mechanical performance will be presented.
    SMST 2013/ The International Conference on Shape Memory and Superelastic Technologies American Society for Metals; 05/2013

Publication Stats

2k Citations
658.74 Total Impact Points

Institutions

  • 2014
    • Basque Center for Materials, Applications and Nanostructures
      Basque Country, Spain
  • 1983–2014
    • Universidad del País Vasco / Euskal Herriko Unibertsitatea
      • • Departamento de Electricidad y Electrónica
      • • Facultad de Ciencia y Tecnología
      • • Departamento de Física de Materiales
      Leioa, Basque Country, Spain
  • 2012
    • Ikerbasque - Basque Foundation for Science
      Bilbo, Basque Country, Spain
  • 2006–2009
    • University of Zaragoza
      • Faculty of Sciences (CIENCIAS)
      Caesaraugusta, Aragon, Spain
    • Tohoku University
      Japan
  • 2003–2008
    • University of Oviedo
      • Department of Physics
      Oviedo, Asturias, Spain
  • 1987–2001
    • Complutense University of Madrid
      • Instituto de Magnetismo Aplicado
      Madrid, Madrid, Spain
  • 1979–2001
    • Universidad de Navarra
      Iruña, Navarre, Spain
  • 1999
    • University of Campinas
      • Instituto de Física "Gleb Wataghin" (IFGW)
      Campinas, Estado de Sao Paulo, Brazil
  • 1987–1998
    • Universidad de Cantabria
      • Faculty of Sciences
      Santander, Cantabria, Spain
  • 1991–1995
    • Spanish National Research Council
      • Instituto de Ciencia de Materiales de Madrid
      Madrid, Madrid, Spain
  • 1986
    • Instituto de Estructura de la Materia
      Madrid, Madrid, Spain
  • 1985
    • Technical University of Denmark
      København, Capital Region, Denmark