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Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2010

Magnetization reversal of a single cobalt cluster using a RF field pulse

Résumé

Technological improvements require the understanding of dynamical magnetization reversal processes at the nanosecond time scales. In this paper, we present the first magnetization reversal measurements performed on a single cobalt cluster (counting only a thousand of spins), using the micro-superconducting quantum interference device (SQUID) technique by applying a constant magnetic field combined with a radio-frequency (RF) field pulse. First of all, we present the different technical steps necessary to detect the magnetic reversals at low temperature (T = 35 mK) of a well-defined nanoparticle prepared by low energy clusters beam deposition (LECBD). We previously showed that the three-dimensional (3D)-switching Stoner-Wohlfarth astroid represents the magnetic anisotropy of the nanoparticle. Then, an improved device coupled with a gold stripeline, allow us to reverse such macrospin, using a RF pulse. A qualitative understanding of the magnetization reversal by non-linear resonance has been obtained with the Landau-Lifschitz-Gilbert (LLG) equation.

Dates et versions

hal-00979636 , version 1 (16-04-2014)

Identifiants

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A. Tamion, C. Raufast, Edgar Bonet, V. Dupuis, Thierry Fournier, et al.. Magnetization reversal of a single cobalt cluster using a RF field pulse. Journal of Magnetism and Magnetic Materials, 2010, 322 (9-12), pp.1315-1318. ⟨10.1016/j.jmmm.2009.04.013⟩. ⟨hal-00979636⟩
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