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

doi:10.1088/1674-1056/abad1d

Abstract

Tuning magnetic damping constant in dedicated spintronic devices has important scientific and technological implications. Here we report on anisotropic damping in various compositional amorphous CoFeB films grown on GaAs(001) substrates. Measured by a vector network analyzer-ferromagnetic resonance (VNA-FMR) equipment, a giant magnetic damping anisotropy of 385%, i.e., the damping constant increases by about four times, is observed in a 10-nm-thick Co₄₀Fe₄₀B₂₀ film when its magnetization rotates from easy axis to hard axis, accompanied by a large and pure in-plane uniaxial magnetic anisotropy (UMA) with its anisotropic field of about 450 Oe. The distinct damping anisotropy is mainly resulted from anisotropic two-magnon-scattering induced by the interface between the ferromagnetic layer and the substrate, which also generates a significant UMA in the film plane.

Keywords: magnetic damping uniaxial magnetic anisotropy ferromagnetic resonance two-magnon scattering

Received: 05 July 2020
Revised: 31 July 2020
Accepted manuscript online: 07 August 2020

PACS:	75.78.-n	(Magnetization dynamics)
	75.30.Gw	(Magnetic anisotropy)
	76.50.+g	(Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)

Corresponding Authors: ^†Corresponding author. E-mail: liubo@hikstor.com ^‡Corresponding author. E-mail: jdu@nju.edu.cn

About author:

†Corresponding author. E-mail: liubo@hikstor.com

‡Corresponding author. E-mail: jdu@nju.edu.cn

* Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300803), the National Natural Science Foundation of China (Grant Nos. 51971109, 51771053, and 51471085), and Scientific Research Foundation of Nanjing Institute of Technology (Grant Nos. ZKJ201708 and CKJB201708).

Cite this article:

Ji Wang(王佶), Hong-Qing Tu(涂宏庆), Jian Liang(梁健), Ya Zhai(翟亚), Ruo-Bai Liu(刘若柏), Yuan Yuan(袁源), Lin-Ao Huang(黄林傲), Tian-Yu Liu(刘天宇), Bo Liu(刘波)†, Hao Meng(孟皓), Biao You(游彪), Wei Zhang(张维), Yong-Bing Xu(徐永兵), and Jun Du(杜军)‡ Giant anisotropy of magnetic damping and significant in-plane uniaxial magnetic anisotropy in amorphous Co₄₀Fe₄₀B₂₀ films on GaAs(001) 2020 Chin. Phys. B 29 107503

Fig. 1.

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

Fig. 2.

The M–H loops measured along [110] (a) and $ [1\bar{1}0] $ (b) crystallographic orientations of the GaAs(001) substrate and the azimuthal dependence of remanence ratio (c) for samples S1 and S2.

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.

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.

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

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