Giant anisotropy of magnetic damping and significant in-plane uniaxial magnetic anisotropy in amorphous Co40Fe40B20 films on GaAs(001)

Ji Wang; Hong-Qing Tu; Jian Liang; Ya Zhai; Ruo-Bai Liu; Yuan Yuan; Lin-Ao Huang; Tian-Yu Liu; Bo Liu; Hao Meng; Biao You; Wei Zhang; Yong-Bing Xu; Jun Du

doi:10.1088/1674-1056/abad1d

Chinese Physics B, Volume. 29, Issue 10, (2020)

Giant anisotropy of magnetic damping and significant in-plane uniaxial magnetic anisotropy in amorphous Co₄₀Fe₄₀B₂₀ films on GaAs(001)

Ji Wang¹, Hong-Qing Tu^1,2, Jian Liang³, Ya Zhai³, Ruo-Bai Liu¹, Yuan Yuan¹, Lin-Ao Huang¹, Tian-Yu Liu¹, Bo Liu^4、†, Hao Meng⁴, Biao You^1,6, Wei Zhang^1,6, Yong-Bing Xu⁵, and Jun Du^1,6

Author Affiliations

¹National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 20093, China

²Department of Mathematics and Physics, Nanjing Institute of Technology, Nanjing 11167, China

³Department of Physics and Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, China

⁴Key Laboratory of Spintronics Materials, Devices and Systems of Zhejiang Province, Hangzhou 311300, China

⁵Department of Electronic Engineering, Nanjing University, Nanjing 210093, China

⁶Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

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Fig. 1. XRD patterns for the Co₄₀Fe₄₀B₂₀ film samples and a pure GaAs(001) substrate.

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Fig. 2. The M–H loops measured along [110] (a) and [11¯0] (b) crystallographic orientations of the GaAs(001) substrate and the azimuthal dependence of remanence ratio (c) for samples S1 and S2.

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Fig. 3. (a) The measurement configuration of VNA-FMR. (b) Typical VNA-FMR spectra for several selected frequencies at φ_H = 0°. (c) Typical VNA-FMR spectra at various azimuthal angles recorded at f = 10 GHz. (d) The experimental (square dots) and fitted (red line) in-plane azimuthal dependence of H_r at f = 10 GHz.

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Fig. 4. (a) The H_r dependences of frequency at φ_H = 0°, 30°, 60°, 75°, 90°, (b) azimuthal dependence of ΔH at f = 10 GHz, (c) frequency dependences of ΔH at φ_H = 0°, 30°, 60°, 75°, 90°, and (d) azimuthal dependence of α_eff for sample S1. The experimental results are shown as dots and the fitted results are shown as lines except for (b), in which the line is only guide to eyes.

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Table 1. Magnetic damping constants at various azimuthal angles and the corresponding values of η in the CoFeB films with different compositions and thicknesses. The data for the Co₅₆Fe₂₄B₂₀ (10 nm) and Co₅₆Fe₂₄B₂₀ (20 nm) films are taken from Ref. [24].

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Table 1. Magnetic damping constants at various azimuthal angles and the corresponding values of η in the CoFeB films with different compositions and thicknesses. The data for the Co₅₆Fe₂₄B₂₀ (10 nm) and Co₅₆Fe₂₄B₂₀ (20 nm) films are taken from Ref. [24].

Sample	0°	30°	60°	90°	η
Co₂₀Fe₆₀B₂₀ (10 nm)	0.0088±0.0004	0.0089±0.0004	0.0173±0.0009	0.0343±0.0009	290%
Co₂₀Fe₆₀B₂₀ (20 nm)	0.0086±0.0003	0.0087±0.0005	0.0121±0.0005	0.0162±0.0007	88%
Co₄₀Fe₄₀B₂₀ (10 nm)	0.0099±0.0005	0.0100±0.0005	0.0208±0.0009	0.0480±0.0009	385%
Co₄₀Fe₄₀B₂₀ (20 nm)	0.0087±0.0003	0.0089±0.0003	0.0142±0.0003	0.0190±0.0007	118%
Co₅₆Fe₂₄B₂₀ (10 nm)	0.0116±0.0003	0.0124±0.0005	0.0192±0.0009	0.0242±0.0009	109%
Co₅₆Fe₂₄B₂₀ (20 nm)	0.0103±0.0005	0.0104±0.0005	0.0141±0.0005	0.0151±0.0005	47%

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Ji Wang, Hong-Qing Tu, Jian Liang, Ya Zhai, Ruo-Bai Liu, Yuan Yuan, Lin-Ao Huang, Tian-Yu Liu, Bo Liu, Hao Meng, Biao You, Wei Zhang, Yong-Bing Xu, Jun Du. Giant anisotropy of magnetic damping and significant in-plane uniaxial magnetic anisotropy in amorphous Co₄₀Fe₄₀B₂₀ films on GaAs(001)[J]. Chinese Physics B, 2020, 29(10):

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Paper Information

Received: Jul. 5, 2020

Accepted: --

Published Online: Apr. 21, 2021

The Author Email: Bo Liu (jdu@nju.edu.cn)

DOI:10.1088/1674-1056/abad1d

Topics

Table 1. Magnetic damping constants at various azimuthal angles and the corresponding values of η in the CoFeB films with different compositions and thicknesses. The data for the Co56Fe24B20 (10 nm) and Co56Fe24B20 (20 nm) films are taken from Ref. [24].

Table 1. Magnetic damping constants at various azimuthal angles and the corresponding values of η in the CoFeB films with different compositions and thicknesses. The data for the Co56Fe24B20 (10 nm) and Co56Fe24B20 (20 nm) films are taken from Ref. [24].

Table 1. Magnetic damping constants at various azimuthal angles and the corresponding values of η in the CoFeB films with different compositions and thicknesses. The data for the Co₅₆Fe₂₄B₂₀ (10 nm) and Co₅₆Fe₂₄B₂₀ (20 nm) films are taken from Ref. [24].

Table 1. Magnetic damping constants at various azimuthal angles and the corresponding values of η in the CoFeB films with different compositions and thicknesses. The data for the Co₅₆Fe₂₄B₂₀ (10 nm) and Co₅₆Fe₂₄B₂₀ (20 nm) films are taken from Ref. [24].