Ultrafast optical probe of coherent acoustic phonons in Co2MnAl Heusler film

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

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
Accepted manuscript online:

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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Ultrafast optical probe of coherent acoustic phonons in Co2MnAl Heusler film

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Ultrafast optical probe of coherent acoustic phonons in Co₂MnAl Heusler film