Spin tunneling properties in mesoscopic magnets: effects of a magnetic field

Details Spin tunneling properties in mesoscopic magnets: effects of a magnetic field Spin tunneling properties in mesoscopic magnets: effects of a magnetic field

2002-01-23

arxiv.org/abs/cond-mat/0201406v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

27 pages, 4 figures, accepted by Euro. Phys. J. B

Scientific paper

The tunneling of a giant spin at excited levels is studied theoretically in mesoscopic magnets with a magnetic field at an arbitrary angle in the easy plane. Different structures of the tunneling barriers can be generated by the magnetocrystalline anisotropy, the magnitude and the orientation of the field. By calculating the nonvacuum instanton solution explicitly, we obtain the tunnel splittings and the tunneling rates for different angle ranges of the external magnetic field ($\theta_{H}=\pi/2$ and $\pi/2<\theta_{H}<\pi$). The temperature dependences of the decay rates are clearly shown for each case. It is found that the tunneling rate and the crossover temperature depend on the orientation of the external magnetic field. This feature can be tested with the use of existing experimental techniques.

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