Engineering Gilbert damping by dilute Gd doping in soft magnetic Fe thin films
作者： W. Zhang , S. Jiang , P. K. J. Wong , L. Sun , Y. K. Wang
DOI: 10.1063/1.4862091
关键词: Condensed matter physics 、 Materials science 、 Film plane 、 Doping 、 Thin film 、 Magnetometer 、 Magnetic anisotropy 、 Ferromagnetic resonance 、 Magnetic circular dichroism 、 Coercivity 、 General Physics and Astronomy
摘要: By analyzing the ferromagnetic resonance linewidth, we show that Gilbert damping constant in soft magnetic Fe thin films can be enhanced by ∼6 times with Gd doping of up to 20%. At same time, easy axis remains film plane while coercivity is strongly reduced after inclusion. X-ray circular dichroism measurements reveal a strong increase orbital-to-spin moment ratio increasing concentration, full agreement obtained for these films. Combined x-ray diffraction and vibrating sample magnetometry, results demonstrate FeGd dilute 20% are promising candidates spin-transfer-torque applications devices, which an required.
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