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L. Elbaile

Bio: L. Elbaile is an academic researcher from University of Oviedo. The author has contributed to research in topics: Amorphous solid & Coercivity. The author has an hindex of 9, co-authored 40 publications receiving 308 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the magnetization process and the magnetic domains of the FeNi (100 nm)/Cu (2.5 nm)/FeNi(100 nm) structure were studied, which consists of two FeNi/Cu/FeNi trilayers with a thick direction perpendicular to the plane of the sensitive element and narrow in the direction of the flowing current Cu electrode in the centre.
Abstract: The magnetization process and the magnetic domains of the FeNi (100 nm)/Cu (2.5 nm)/FeNi (100 nm)/Cu (480 nm)/FeNi (100 nm)/Cu (2.5 nm)/FeNi (100 nm) structure were studied. This geometry consists of two FeNi/Cu/FeNi trilayers with a thick in the direction perpendicular to the plane of the sensitive element and narrow in the direction of the flowing current Cu electrode in the centre. Ferromagnet/conductor/ferromagnet is the typical geometry of magnetoimpedance thin-film-based sensitive elements used to detect small magnetic fields. Multilayered structures were prepared by rf-sputtering in a magnetic field of 100 Oe applied perpendicular to the Cu electrode in order to induce transverse magnetic anisotropy. The magnetic measurements and magnetic domain structure observations were made in magnetic fields applied one at a time parallel or perpendicular to the Cu electrode. Different magnetization processes with non-homogeneous rotations in the first case and dominant multiple nucleation and merging of domains in the second one were observed.

59 citations

Journal ArticleDOI
TL;DR: In this article, the internal stresses are obtained from the variation of the radius of curvature of the samples when the layers are removed, and a general feature has been observed implying compressive stress near both surfaces.
Abstract: The layer removing method for determining the internal stress distribution through thickness in sheets has been applied to metallic glass ribbons. The internal stresses are obtained from the variation of the radius of curvature of the samples when the layers are removed. The experimental technique used is described here and the results for two ribbons, are presented. A general feature has been observed implying compressive stress near both surfaces (a strong one near the drum surface and a weak one near the air surface), and the central part under tensile stress. This is in agreement with the residual stress distribution shown by other materials after fast cooling procedures.

33 citations

Journal ArticleDOI
TL;DR: In this paper, the magnetic properties of carbon nanotubes obtained by plasmaenhanced chemical vapour deposition (PECVD) have been studied and the results show that the wide size range (30-180 nm) of the particles originates the coexistence of blocked and superparamagnetic particles and leads to the strong ferromagnetic behaviour of the whole assembly.
Abstract: Magnetic properties of carbon nanotubes (CNT) obtained by plasma-enhanced chemical vapour deposition (PECVD) have been studied. The growth of these nanotubes has been activated from Ni catalyst nanoparticles. Samples consist of Ni nanoparticles encapsulated at the tip of vertically aligned multiwalled carbon nanotubes (VACNTs) forming an homogeneous and dense large area monolayer of isolated (non-contacting) nanoparticles. The magnetic characterisation has been performed in the temperature range of 5-300 K with magnetic fields up to 9 T. The results show that the wide size range (30-180 nm) of the particles originates the coexistence of blocked and superparamagnetic particles and leads to the strong ferromagnetic behaviour of the whole assembly. The coercivity decreases monotonically with increasing temperature and the value for the intrinsic coercivity is 225 Oe. The encapsulation of Ni nanoparticles by VACNTs preserves them from aggregation. This makes possible to tune the coercivity by controlling size distribution of particle monolayers. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

31 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented a robust, highly reproducible and low-cost method to obtain superparamagnetic magnetite nanoparticles (MNP-II) of about diameter by thermal decomposition of [Fe(acac)3] in a one-pot, two-step method.
Abstract: Magnetic nanoparticles have been largely proposed as means of technological tools due to its value in different fields, especially in biomedicine. Herein, we present a robust, highly reproducible and low-cost method to obtain superparamagnetic magnetite nanoparticles (MNP-II) of about diameter by thermal decomposition of [Fe(acac)3] in a one-pot, two-step method. In the first step, magnetite nanoparticles (MNP-I) of lower size, , with a saturation magnetization ( ) of 65 emu/g and a coercive field ( ) of 1 Oe are obtained. In the second step, those particles MNP-I act as seeds for the final MNP-II which present a saturation magnetization of 70 emu/g and a coercive field of 12 Oe.

28 citations

Journal ArticleDOI
TL;DR: In this paper, a method to induce magnetic anisotropy in amorphous magnetic ribbons has been developed by applying a magnetic field at the moment of the solidification of the melt.
Abstract: A method to induce magnetic anisotropy in amorphous magnetic ribbons has been developed. The anisotropy is induced in the high Curie temperature Fe80B20 and Co70Mn5Fe1Mo1Si14B9 amorphous magnetic ribbons by applying a magnetic field at the moment of the solidification of the melt. This method does not affect the excellent mechanical properties of these materials. The induced magnetic anisotropy has been measured by torque magnetometry and its strength and easy axis are compared with the results obtained by other authors using static magnetic annealing in similar samples.

19 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors provide a comprehensive summary of the GMI topic, encompassing fundamental understanding of the giant magneto-impedance (GMI) phenomena, the processing and properties of GMI materials and the design and application of magnetic sensors.

782 citations

Book
03 Dec 2003
TL;DR: In this paper, the density functional theory of the ground state magnetic properties of rare earths and actinides is presented, as well as the properties of binary rare-earth 3d-transition-metal intermetallic compounds.
Abstract: Preface. Contents of volumes 1-6. 1. Magnetism in ultrathin transition metal films (U. Gradmann). 2. Energy band theory of metallic magnetism in the elements (V.L. Moruzzi, P.M. Marcus). 3. Density functional theory of the ground state magnetic properties of rare earths and actinides (M.S.S. Brooks, B. Johansson). 4. Diluted magnetic semiconductors (J. Kossut, W. Dobrowolski). 5. Magnetic properties of binary rare-earth 3d-transition-metal intermetallic compounds (J.J.M. Franse, R.J. Radwanski). 6. Neutron scattering on heavy fermion and valence fluctuation 4f-systems (M. Loewenhaupt, K.H. Fischer). Author index. Subject index. Materials index.

488 citations

Journal ArticleDOI
TL;DR: It is demonstrated that one can controllably induce residual stresses in a bulk metallic glass, and that they improve the mechanical performance, in particular the plasticity, but that the mechanisms underlying the improvements are distinct from those operating in conventional materials.
Abstract: Metallic glasses, now that many compositions can be made in bulk1,2,3, are of interest for structural applications exploiting their yield stress and yield strain, which are exceptionally high for metallic materials4. Their applicability is limited by their near-zero tensile ductility resulting from work-softening and shear localization. Even though metallic glasses can show extensive local plasticity, macroscopically they can effectively be brittle, and much current research is directed at improving their general plasticity. In conventional engineering materials as diverse as silicate glasses and metallic alloys, we can improve mechanical properties by the controlled introduction of compressive surface stresses5,6,7. Here we demonstrate that we can controllably induce such residual stresses in a bulk metallic glass, and that they improve the mechanical performance, in particular the plasticity, but that the mechanisms underlying the improvements are distinct from those operating in conventional materials.

462 citations

Journal ArticleDOI
TL;DR: State‐of‐the‐art harvesting materials and structures are presented with a focus on characterization, fabrication, modeling and simulation, and durability and reliability, and some perspectives and challenges for the future development of energy harvesting materials are highlighted.

296 citations

Journal ArticleDOI
TL;DR: In this article, the hysteresis curves of cylindrical Ising nanowires are investigated within the effective field theory with correlations at temperatures below, around and above the critical temperature.

123 citations