Journal ArticleDOI
Magnetic properties of Ni nanoparticles dispersed in silica prepared by high-energy ball milling
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In this paper, the magnetic properties of mechanically ground nanosized Ni particles dispersed in a SiO2 matrix were analyzed and the authors concluded that the magneto-elastic anisotropy plays the dominant role in determining the magnet properties of the particles.Abstract:
We analyze the magnetic properties of mechanically ground nanosized Ni particles dispersed in a SiO2 matrix. Our magnetic characterization of the as-milled samples show the occurrence of two blocking processes and that of non-monotonic milling time evolutions of the magnetic-order temperature, the high-field magnetization and the saturation coercivity. The measured coercivities exhibit giant values and a uniaxial-type temperature dependence. Thermal treatment carried out in the as-prepared samples result in a remarkable coercivity reduction and in an increase of the high-field magnetization. We conclude, on the basis of the consideration of a core (pure Ni) and shell (Ni-Si inhomogeneous alloy) particle structure, that the magnetoelastic anisotropy plays the dominant role in determining the magnetic properties of our particles.read more
Citations
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X-ray diffraction line profile analysis of iron ball milled powders
TL;DR: In this article, the size of coherently diffracting domains and the lattice strain of iron ball milled powders have been determined according to various models, including the Williamson-Hall plot, the Voigt model and the Warren-Averbach model.
Journal ArticleDOI
Magnetic properties and spin disorder in nanocrystalline materials
TL;DR: In this paper, the magnetic properties of the particle shell and grain boundaries, generally different to these of the core, and responsible for phenomena such as interphase exchange penetration, Curie temperature enhancement and magnetic coupling are reviewed.
Journal ArticleDOI
Microwave-assisted synthesis and magnetic study of nanosized Ni/NiO materials
C. Parada,Emilio Morán +1 more
TL;DR: In this article, a domestic microwave furnace is used to produce Ni/NiO composites, Ni metal, or NiO, depending on the nickel precursor used, either tetrahydrated nickel acetate or dihydrated nickel formate.
Journal ArticleDOI
An aerosol-mediated magnetic colloid: Study of nickel nanoparticles
TL;DR: In this article, a method for the synthesis of high-quality nickel nanoparticles is presented for using laser-driven decomposition of nickel carbonyl vapors, followed by exposure to a solvent containing an appropriate surfactant to yield a stable dispersion of particles.
Journal ArticleDOI
Unravelling the onset of the exchange bias effect in Ni(core)@NiO(shell) nanoparticles embedded in a mesoporous carbon matrix
Natalia Rinaldi-Montes,Pedro Gorria,David Martínez-Blanco,Zakariae Amghouz,Antonio B. Fuertes,Luis Fernández Barquín,Imanol de Pedro,Luca Olivi,Jesús A. Blanco +8 more
TL;DR: In this article, the authors found that Ni/NiO shell spins inside the NiO shell freeze into a spin glass (SG)-like state below Tf ∼ 40 K. This is far below the Neel temperature of bulk antiferromagnetic NiO (TN ∼ 523 K) that usually determines the onset of the exchange bias effect.
References
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Book
X-ray diffraction procedures for polycrystalline and amorphous materials
Harold P. Klug,Leroy Alexander +1 more
Journal ArticleDOI
X-ray diffraction procedures for polycrystalline and amorphous materials
BookDOI
Science and Technology of Nanostructured Magnetic Materials
TL;DR: In this article, a special session on spin-polarized vacuum tunneling and force microscopy applied to magnetic materials was held. And the results of the special session were presented.