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Article Dans Une Revue Journal of Physics D: Applied Physics Année : 2007

Magnetism and tunnelling magnetoresistance of Fe nanoparticles embedded in ZnSe epilayers

Résumé

We report on the magnetic and magnetotransport properties of Fe clustered particles embedded in a ZnSe matrix. The samples are prepared by molecular beam epitaxy and consist of discontinuous Fe planes of unconnected particles covered by a 4.5 nm-thick epilayer of ZnSe, repeated in 20 cycles. Scanning tunnelling microscopy and transmission electron microscopy revealed well isolated and regularly dispersed Fe nanoparticles. This particle assembly displays a dominant superparamagnetic response with weak inter-particle magnetic interactions. The magnetotransport experiments performed in the current-in-plane geometry showed a negative magnetoresistance of 2% at low temperature, which is described by localized states through a ZnSe semiconducting barrier.

Dates et versions

hal-01293145 , version 1 (24-03-2016)

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J. Varalda, G. A. P. Ribeiro, M. Eddrief, M. Marangolo, J. M. George, et al.. Magnetism and tunnelling magnetoresistance of Fe nanoparticles embedded in ZnSe epilayers. Journal of Physics D: Applied Physics, 2007, 40 (8), pp.2421-2424. ⟨10.1088/0022-3727/40/8/001⟩. ⟨hal-01293145⟩
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