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Magnetic properties of Ni nanoparticles dispersed in silica prepared by high-energy ball milling

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González Herrera, Elvira María and Montero, M. I. and Cebollada, F. and De Julián Fernández, C and Vicent López, José Luis and González, J. M. (1998) Magnetic properties of Ni nanoparticles dispersed in silica prepared by high-energy ball milling. Europhysics letters, 42 (1). pp. 91-96. ISSN 0295-5075

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Official URL: http://dx.doi.org/10.1209/epl/i1998-00557-x


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Abstract

We analyze the magnetic properties of mechanically ground nanosized Ni particles dispersed in a SiO_2 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.


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©EDP Sciences.

Uncontrolled Keywords:Metal-films
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:43919
Deposited On:22 Aug 2017 17:16
Last Modified:22 Aug 2017 17:16

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