Spin Dynamics in a Tunnel Junction between Ferromagnets
介观与纳米尺度物理
2011-11-09 v3 统计力学
摘要
The dynamics of a single spin embedded in the tunnel junction (quantum point contact) between ferromagnets is addressed. Using the Keldysh technique, we derive a quantum Langevin equation. As a consequence of the spin-polarization in the leads, the spin displays a rich and unusual dynamics. Parallel configured and equally strong magnetic moments in the leads yield an ordinary spin precession with a Larmor frequency given by the effective magnetic field. Unequal and/or non-parallel configured magnetization, however, causes nutation of the spin in addition to the precession. Our predictions may be directly tested for macroscopic spin clusters.
引用
@article{arxiv.cond-mat/0609673,
title = {Spin Dynamics in a Tunnel Junction between Ferromagnets},
author = {J. Fransson and Jian-Xin Zhu},
journal= {arXiv preprint arXiv:cond-mat/0609673},
year = {2011}
}
备注
5 pages, 1 figure, accepted in the New Journal of Physics