Quantum tunneling of the magnetic moment in a free nanoparticle

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:324

Article

O'Keeffe, M. F.¹  Chudnovsky, E. M.¹  Garanin, D. A.¹ 

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

关键词: Spin;    Rotator;    Tunneling;   

DOI  :  10.1016/j.jmmm.2012.04.032

来源: Elsevier

【 摘 要 】

We study tunneling of the magnetic moment in a particle that has full rotational freedom. Exact energy levels are obtained and the ground-state magnetic moment is computed for a symmetric rotor. The effect of mechanical freedom on spin tunneling manifests itself in a strong dependence of the magnetic moment on the moments of inertia of the rotor. The energy of the particle exhibits quantum phase transitions between states with different values of the magnetic moment. Particles of various shapes are investigated and the quantum phase diagram is obtained. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

Free