I. Orue - Academia.edu (original) (raw)

Papers by I. Orue

Solid State Phenomena, 2010

Structure and magnetic properties of nanoscale [Gd/Ti]n multilayers prepared by rf-sputtering are... more Structure and magnetic properties of nanoscale [Gd/Ti]n multilayers prepared by rf-sputtering are studied. It is found that the decrease in the Gd layer thickness LGd leads to beginning of the structure transformation in Gd layers from the fine-crystalline to amorphous state when LGd becomes less than 2 nm. The Curie temperature TC decreases as a function of the Gd layer thickness in the same way as in early studied epitaxially grown Gd films, i.e. in case for which the finite-size effect plays most important role. A deviation of the TC(LGd) behaviour at very low LGd from the fit according to the finite-size law is probably caused by the island-like structure of the Gd layers.

IEEE Transactions on Magnetics, 2010

IEEE Transactions on Magnetics, 2005

The Journal of Physical Chemistry C, 2020

Nanoscale, 2016

We report a combined structural and magnetic study of the mineral core biomineralized by horse sp... more We report a combined structural and magnetic study of the mineral core biomineralized by horse spleen ferritin and three prokaryotic ferritin-like proteins: bacterial ferritin and bacterioferritin from Escherichia coli and archaeal ferritin from Pyrococcus furiosus.

Nanoscale, 2018

Magnetospirillum gryphiswaldense is a microorganism with the ability to biomineralize magnetite n... more Magnetospirillum gryphiswaldense is a microorganism with the ability to biomineralize magnetite nanoparticles, called magnetosomes, and arrange them into a chain that behaves like a magnetic compass.

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations, 2009

Le Journal de Physique Colloques, 1988

Journal of Physics: Condensed Matter, 1997

Journal of Non-Crystalline Solids, 2007

Journal of Applied Physics, 2003

Polymer-bonded composites of a Fe–Co based alloy are fabricated and their magnetic and mechanical... more Polymer-bonded composites of a Fe–Co based alloy are fabricated and their magnetic and mechanical properties are characterized. The use of flake-type powders with a thickness of 3–5 μm, instead of conventional spherical powders, is the key to good magnetostrictive properties and this is made possible by suitable design of the alloy (Fe36Co62Ge2) and the development of a pulverization process. The composites exhibit high magnetostriction of 105 ppm measured at an applied field of 4.3 kOe (70 ppm at 1 kOe). Large compressive strength of 42 MPa is also obtained for the composites, indicating solid bonding of flake-type powders by the polymer.

Journal of Applied Physics, 2009

Journal of Physics: Conference Series, Dec 1, 2017

We present results concerning the synthesis, magnetic, dielectric and microwave absorption proper... more We present results concerning the synthesis, magnetic, dielectric and microwave absorption properties of BaFe12O19 / P(VDF-TrFE) nanocomposites. First, barium ferrite nanopowders were prepared by the hydrothermal synthesis method. Structural and morphological properties of the prepared powders were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM), showing as result a good quality spherical plus platelet-like shaped nanoparticles. Afterwards, composite films with filler nanoparticles of barium ferrite BaFe12O19 (BaFO, nominal 5-20 wt.%) dispersed within P(VDF-TrFE) acting as polymeric matrix have been prepared by solvent evaporation. Magnetic properties were examined by the vibrating sample magnetometry (VSM), and a direct comparison of results obtained for the composites respect to the pure nanopowder allow us to obtain the true nanofiller content value, different from the initially nominal one. Dielectric properties have been measured up to 2 MHz and show the typical behaviour of Maxwell-Wagner type interfacial polarization. From 10 kHz up, permittivity of the composites remains almost unchanged, with values that show a smooth increase as the %wt. of BaFe12O19 does. Finally, microwave absorption properties were analyzed by using ESR technique operating at X-band. All obtained results are discussed in terms of size and quantity of the composites BaFe12O19 filler nanoparticles.

Inorganic Chemistry, 2015

Nanoparticulate Fe2O3 and Fe2O3/C composites with different carbon proportions have been prepared... more Nanoparticulate Fe2O3 and Fe2O3/C composites with different carbon proportions have been prepared for anode application in lithium ion batteries (LIBs). Morphological studies revealed that particles of Fe2O3 in the composites were well-dispersed in the matrix of amorphous carbon. The properties of the γ-Fe2O3 nanoparticles and the correlation with the particle size and connectivity were studied by electron paramagnetic resonance, magnetic, and Mössbauer measurements. The electrochemical study revealed that composites with carbon have promising electrochemical performances. These samples yielded specific discharge capacities of 1200 mAh/g after operating for 100 cycles at 1C. These excellent results could be explained by the homogeneity of particle size and structure as well as the uniform distribution of γ-Fe2O3 nanoparticles in the in situ generated amorphous carbon matrix.

INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005., 2005

ABSTRACT

physica status solidi (a), 2011