Tunable Magnetic Relaxation In Magnetic Nanoparticles

Details Tunable Magnetic Relaxation In Magnetic Nanoparticles Tunable Magnetic Relaxation In Magnetic Nanoparticles

2003-07-10

arxiv.org/abs/cond-mat/0307256v1

Phys. Rev. Lett. 91, 247201 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 eps figures

Scientific paper

10.1103/PhysRevLett.91.247201

We investigate the magnetization dynamics of a conducting magnetic nanoparticle weakly coupled to source and drain electrodes, under the assumption that all relaxation comes from exchange of electrons with the electrodes. The magnetization dynamics is characterized by a relaxation time $t_1$, which strongly depends on temperature, bias voltage, and gate voltage. While a direct measure of a nanoparticle magnetization might be difficult, we find that $t_1$ can be determined through a time resolved transport measurement. For a suitable choice of gate voltage and bias voltage, the magnetization performs a bias-driven Brownian motion regardless of the presence of anisotropy.

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