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Investigation of Saturation Magnetization and Damping in Tb/Cr/Fe Trilayers

Authors :
Wen Zhang
Zhaocong Huang
Hongru Zhai
Yunxia Sui
Li Sun
Ping Kwan Johnny Wong
Dong Zhang
Ya Zhai
Jun Du
Zhaoxia Kou
Source :
IEEE Transactions on Magnetics. 51:1-4
Publication Year :
2015
Publisher :
Institute of Electrical and Electronics Engineers (IEEE), 2015.

Abstract

The Tb(4 nm)/Cr( ${t}$ nm)/Fe(5 nm) trilayers with different thicknesses of Cr layer have been investigated by X-ray diffraction, vibrating sample magnetometer, and ferromagnetic resonance. When Cr is thinner than 1.8 nm, the ferromagnetic coupling of Tb and Fe leads to higher saturation magnetization ( $M_{s}$ ) than that of Fe(5 nm) film. On the other hand, the Gilbert damping constant $\alpha $ in all the trilayers have been found to exceed the magnitude of the Fe. In particular, when Cr layer is 1 nm thick, $\alpha $ increases by 38% and $M_{s}$ is increased by 6%; when Cr layer is 4 nm thick, $\alpha $ is increased by 46%, while $M_{s}$ is only decreased by 5%. Accordingly, we have demonstrated a way for enhancing damping and magnetic moment simultaneously in the Tb(4 nm)/Cr( ${t}$ nm)/Fe(5 nm) trilayers.

Details

ISSN :
19410069 and 00189464
Volume :
51
Database :
OpenAIRE
Journal :
IEEE Transactions on Magnetics
Accession number :
edsair.doi...........2bae25516d71a419d1a231c1f8269518
Full Text :
https://doi.org/10.1109/tmag.2015.2443063