Rotational states of a nanomagnet

被引：34

作者：

Chudnovsky, E. M. ^{[1
]}

Garanin, D. A. ^{[1
]}

机构：

[1] CUNY Herbert H Lehman Coll, Dept Phys, Bronx, NY 10468 USA

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 21期

基金：

美国国家科学基金会;

关键词：

SINGLE-MOLECULE MAGNETS; IRON CLUSTERS; FREE COBALT;

D O I：

10.1103/PhysRevB.81.214423

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study a nanomagnet that exhibits spin tunneling and is free to rotate about its anisotropy axis. Hamiltonian of a rotated two-state spin system is derived and exact low-energy eigenstates of the nanomagnet that are superpositions of spin and rotational states are obtained. We show that parameter alpha=2(hS)(2) /( I Delta) determines the ground state of the magnet. Here hS is the spin, I is the moment of inertia, and Delta is the tunnel splitting. The ground-state magnetic moment is zero at alpha <alpha(c)=[1-1/( 2S)(2)]-1 and nonzero at alpha <alpha(c). At alpha ->infinity the spin of the nanomagnet localizes in one of the directions along the anisotropy axis.

引用

页数：5

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