期刊
IEEE TRANSACTIONS ON MAGNETICS
卷 46, 期 6, 页码 2056-2059出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2009.2038929
关键词
Fast magnetization dynamics; Gilbert damping constant; magnetic multilayers; magnetoresistive random access memory (MRAM)
资金
- NEDO
- DAAD
The magnetic properties of CoFeB buffered [Co(0.3 nm)/Pd(x nm)](6) multilayer films have been investigated. It is found that the magnetic properties of the multilayer depended on the Pd thickness and for thickness below 0.5 nm no perperdicular anisotropy is observed. Magnetization dynamics in perpendicularly magnetized CoFeB-[Co/Pd] multilayer films are investigated using time-resolved magneto-optical Kerr effect (TRMOKE). The variation of precession frequency with external magnetic field for different palladium thickness is quantitatively understood using the macrospin approximation of the Landau-Lifshitz-Gilbert equation of motion. The Gilbert damping constant alpha, in the range 0.04-0.1, varying with the palladium thickness is reported. The observed alpha value is comparable to the damping coefficient of bulk Ni, and much lower than the reported values for perpendicularly magnetized films. The CoFeB buffer layer with in-plane anisotropy appears to significantly affect the precession frequency and thus the damping constant of the films.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据