Ultrafast optical probe of coherent acoustic phonons in Co2MnAl Heusler film

doi:10.1088/1674-1056/26/1/016802

中国物理B ›› 2017, Vol. 26 ›› Issue (1): 16802-016802.doi: 10.1088/1674-1056/26/1/016802

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Ultrafast optical probe of coherent acoustic phonons in Co₂MnAl Heusler film

Wei Yan(闫炜), Hai-Long Wang(王海龙), Jian-Hua Zhao(赵建华), Xin-Hui Zhang(张新惠)

State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

收稿日期:2016-07-22 修回日期:2016-10-18 出版日期:2017-01-05 发布日期:2017-01-05
通讯作者: Xin-Hui Zhang E-mail:xinhuiz@semi.ac.cn
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2013CB922303) and the National Natural Science Foundation of China (Grant No. 61334006).

Ultrafast optical probe of coherent acoustic phonons in Co₂MnAl Heusler film

Wei Yan(闫炜), Hai-Long Wang(王海龙), Jian-Hua Zhao(赵建华), Xin-Hui Zhang(张新惠)

State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

Received:2016-07-22 Revised:2016-10-18 Online:2017-01-05 Published:2017-01-05
Contact: Xin-Hui Zhang E-mail:xinhuiz@semi.ac.cn
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2013CB922303) and the National Natural Science Foundation of China (Grant No. 61334006).

摘要/Abstract

摘要：

In this work, pronounced oscillations in the time-resolved reflectivity of Heusler alloy Co₂MnAl films which are epitaxially grown on GaAs substrates are observed and investigated as a function of film thickness, probe wavelength, external magnetic field and temperature. Our results suggest that the oscillation response at 24.5 GHz results from the coherent phonon generation in Co₂MnAl film and can be explained by a propagating strain pulse model. From the probe wavelength dependent oscillation frequency, a sound velocity of (3.85±0.1)×10³ m/s at 800 nm for the epitaxial Co₂MnAl film is determined at room temperature. The detected coherent acoustic phonon generation in Co₂MnAl reported in this work provides a valuable reference for exploring the high-speed magnetization manipulation via magnetoelastic coupling for future spintronic devices based on Heusler alloy films.

关键词: Heusler alloys, coherent acoustic phonon, time-resolved spectroscopy

Abstract:

Key words: Heusler alloys, coherent acoustic phonon, time-resolved spectroscopy

中图分类号: (Mechanical and acoustical properties)

68.60.Bs

75.50.Cc (Other ferromagnetic metals and alloys) 78.47.J- (Ultrafast spectroscopy (<1 psec))

闫炜, 王海龙, 赵建华, 张新惠. Ultrafast optical probe of coherent acoustic phonons in Co₂MnAl Heusler film[J]. 中国物理B, 2017, 26(1): 16802-016802.

Wei Yan(闫炜), Hai-Long Wang(王海龙), Jian-Hua Zhao(赵建华), Xin-Hui Zhang(张新惠). Ultrafast optical probe of coherent acoustic phonons in Co₂MnAl Heusler film[J]. Chin. Phys. B, 2017, 26(1): 16802-016802.

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Ultrafast optical probe of coherent acoustic phonons in Co₂MnAl Heusler film

Ultrafast optical probe of coherent acoustic phonons in Co₂MnAl Heusler film

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