Mesoscopic bound on anisotropy in itinerant ferromagnets

Details Mesoscopic bound on anisotropy in itinerant ferromagnets Mesoscopic bound on anisotropy in itinerant ferromagnets

2004-12-17

arxiv.org/abs/cond-mat/0412488v1

Phys. Rev. Lett. 95, 017202 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 Pages, 1 figure

Scientific paper

10.1103/PhysRevLett.95.017202

We calculate the anisotropy energy of a single-domain ferromagnetic particle in which the only source of anisotropy is the presence of non-magnetic impurities. We find that such anisotropy takes the form of combined easy-axis and easy-plane anisotropies, with random orientations of the axes. Typically the anisotropy energy is of order $N^{1/2} \hbar/tau_{so}$, where $N$ is the number of electrons in the ferromagnetic particle and $\tau_{so}$ is the spin-orbit time.

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