Magnetization reversal via internal spin waves in magnetic nanoparticles

Details Magnetization reversal via internal spin waves in magnetic nanoparticles Magnetization reversal via internal spin waves in magnetic nanoparticles

2009-02-09

arxiv.org/abs/0902.1492v1

Physical Review B 80, 014420 (2009)

Physics

Condensed Matter

Other Condensed Matter

14 PR pages, 5 figure captions, submitted to PRB. All figures are oversize and do not fit into this archive. Please, get the f

Scientific paper

10.1103/PhysRevB.80.014420

By numerically solving the equations of motion for atomic spins we show that internal spin-wave processes in large enough magnetic particles, initially in unstable states, lead to complete magnetization reversal and thermalization. The particle's magnetization strongly decreases in the middle of reversal and then recovers. We identify two main scenarios, exponential and linear spin-wave instabilities. For the latter, the longitudinal and transverse relaxation rates have been obtained analytically. Orientation dependence of these rates leads to a nonexponential relaxation of the particle's magnetization at long times.

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