Quantum tunneling of the magnetic moment in a free nanoparticle
- 作者：M.F. O'Keeffe ; E.M. Chudnovsky ; eugene.chudnovsky@lehman.cuny.edu ; D.A. Garanin
- 关键词：Spin ; Rotator ; Tunneling
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2012
- 期刊代码：31_03048853
- 类别：ph
- 出版时间：September, 2012
- 卷：324
- 期：18
- 页码：2871-2878
- 文件大小：459 K
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.