Foros Jørn, Brataas Arne, Tserkovnyak Yaroslav, Bauer Gerrit E W
Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
Phys Rev Lett. 2005 Jul 1;95(1):016601. doi: 10.1103/PhysRevLett.95.016601. Epub 2005 Jun 27.
By scattering theory we show that spin current noise in normal electric conductors in contact with nanoscale ferromagnets increases the magnetization noise by means of a fluctuating spin-transfer torque. Johnson-Nyquist noise in the spin current is related to the increased Gilbert damping due to spin pumping, in accordance with the fluctuation-dissipation theorem. Spin current shot noise in the presence of an applied bias is the dominant contribution to the magnetization noise at low temperatures.
通过散射理论，我们表明与纳米级铁磁体接触的普通电导体中的自旋电流噪声通过波动的自旋转移力矩增加了磁化噪声。根据涨落耗散定理，自旋电流中的约翰逊 - 奈奎斯特噪声与由于自旋泵浦导致的吉尔伯特阻尼增加有关。在存在外加偏压的情况下，自旋电流散粒噪声是低温下磁化噪声的主要贡献。
