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Chin. Phys. B, 2017, Vol. 26(1): 016802    DOI: 10.1088/1674-1056/26/1/016802
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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
Abstract  

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.

Keywords:  Heusler alloys      coherent acoustic phonon      time-resolved spectroscopy  
Received:  22 July 2016      Revised:  18 October 2016      Published:  05 January 2017
PACS:  68.60.Bs (Mechanical and acoustical properties)  
  75.50.Cc (Other ferromagnetic metals and alloys)  
  78.47.J- (Ultrafast spectroscopy (<1 psec))  
Fund: 

Project supported by the National Basic Research Program of China (Grant No. 2013CB922303) and the National Natural Science Foundation of China (Grant No. 61334006).

Corresponding Authors:  Xin-Hui Zhang     E-mail:  xinhuiz@semi.ac.cn

Cite this article: 

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 2017 Chin. Phys. B 26 016802

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