Temperature-dependent Gilbert damping in Co2 FeAl thin films with different B2 ordering degrees

doi:10.1088/1674-1056/abb231

Abstract The temperature-dependent Gilbert damping in Co₂FeAl thin film grown on a Pb(Mg_{1 / 3}Nb_{2 / 3})O₃-30%PbTiO₃ substrate is investigated by the systematic measurement of physical property measurement system (PPMS) on a series of samples with different substrate temperatures. Varying the substrate temperatures from 350 ^°C to 500 ^°C, the B2 ordering degrees of Co₂FeAl thin films increase, which can lead the Gilbert damping to decrease, indicated by the field-sweep in-plane PPMS measurements. In addition, the measurement result of PPMS demonstrates that the Gilbert damping decreases first with measurement temperature decreasing down to about 150 K, then increases at a measurement temperature of ∼ 50 K, and decreases again with the measurement temperature decreasing. There are two independent damping manners, namely bulk damping and surface damping, which contribute to the Gilbert damping. Moreover, the observed peak of Gilbert damping at ∼ 50 K can be attributed to the spin re-orientation transition at the Co₂FeAl surface, which is similar to the result of the effective magnetization as a function of measurement temperature. The result presents the evidence for further studying the Gilbert damping in Co₂FeAl thin film.

Keywords: Gilbert damping Co₂FeAl thin film B2 ordering degree

Received: 17 May 2020
Revised: 05 August 2020
Accepted manuscript online: 25 August 2020

PACS:	67.30.er	(Magnetic properties, NMR)
	67.80.dk	(Magnetic properties, phases, and NMR)
	75.50.-y	(Studies of specific magnetic materials)
	62.25.Fg	(High-frequency properties, responses to resonant or transient (time-dependent) fields)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51671099, 11974149, and 51901163) and the Program for Changjiang Scholars and Innovative Research Team in University, China (Grant No. IRT-16R35).

Corresponding Authors: ^†Corresponding author. E-mail: szhou@wtu.edu.cn ^‡Corresponding author. E-mail: jiangchj@lzu.edu.cn

Cite this article:

Gesang Dunzhu(格桑顿珠), Yi-Bing Zhao(赵逸冰), Ying Jin(金莹), Cai Zhou(周偲), and Chang-Jun Jiang(蒋长军) Temperature-dependent Gilbert damping in Co₂ FeAl thin films with different B2 ordering degrees 2020 Chin. Phys. B 29 126701

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Temperature-dependent Gilbert damping in Co2 FeAl thin films with different B2 ordering degrees

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Temperature-dependent Gilbert damping in Co₂ FeAl thin films with different B2 ordering degrees