Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2000-05-23
J. Phys.:Condens. Matter 12 (2000) 4503-4522.
Physics
Condensed Matter
Statistical Mechanics
31 pages, 3 figures, accepted by J. Phys.: Conden. Matter
Scientific paper
10.1088/0953-8984/12/20/306
The quantum tunneling of the magnetization vector are studied theoretically in single-domain ferromagnetic nanoparticles placed in an external magnetic field at an arbitrarily directed angle in the $ZX$ plane. We consider the magnetocrystalline anisotropy with trigonal and hexagonal crystal symmetry, respectively. By applying the instanton technique in the spin-coherent-state path-integral representation, we calculate the tunnel splittings, the tunneling rates and the crossover temperatures in the low barrier limit for different angle ranges of the external magnetic field ($\theta_{H}=\pi/2$, $\pi/2\ll\theta_{H}\ll\pi$, and $\theta_{H}=\pi$). Our results show that the tunnel splittings, the tunneling rates and the crossover temperatures depend on the orientation of the external magnetic field distinctly, which provides a possible experimental test for magnetic quantum tunneling in nanometer-scale single-domain ferromagnets.
Chang Lee
Gu Bing-Lin
Liu Zhi-Rong
Lu Rong
Zhu Jia-Lin
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