Ultrafast optical probe of coherent acoustic phonons in <inline-formula> <img src="cpb_26_1_016802ieqn1.gif"/> </inline-formula> Heusler film

Ultrafast optical probe of coherent acoustic phonons in

Heusler film

Yan Wei, Wang Hai-Long, Zhao Jian-Hua, Zhang Xin-Hui^†

(color online) (a) Oscillatory components of the time-resolved reflectivity and their best fits (red solid line) by varying wavelength of probe beam for 100-nm-thick Co₂MnAl film; (b) fast Fourier transforms of the periodic oscillations measured at different wavelengths of probe beam. The dashed line shows a guide for the eye for highlighting the variation of oscillation frequency as a function of probe wavelength.