| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7990278 | Journal of Alloys and Compounds | 2018 | 5 Pages |
Abstract
Gilbert damping enhancement induced by the spin pumping effect is investigated in Y3Fe5O12(YIG)/heavy metal bilayers. Because its spin polarization is high and Gilbert damping is low, Co2FeAl0.5Si0.5 (CFAS) is deemed a promising ferromagnetic material in spintronics devices. We studied microwave dynamic magnetizations in YIG/CFAS bilayers combined with ferromagnetic resonance measurement using a vector network analyzer to reveal a 5-fold giant damping enhancement compared with that for the YIG/Pt bilayers. This phenomenon was attributed to both the exchange coupling effect and spin pumping effect. By inserting a 10-nm Cu spacer, direct exchange coupling can be suppressed. A spin mixing conductance geffââ of 7.75â¯Ãâ¯1018mâ2 generated by spin pumping was obtained. The study provides an effective approach to tailor the damping in magnetic thin films.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Mingming Li, Huaiwu Zhang, Y.H. Rao, Caiyun Hong, Zhiyong Zhong, Qinghui Yang, Xiaoli Tang, Lichuan Jin,