Magnetic anisotropy manipulation of the femtosecond laser-excited spin wave modes in full-Heusler Co2Fe1-x Mn x Al films

S F Li; K K Meng; C Y Cheng; J H Zhao; T S Lai

doi:10.1088/1361-648X/aaea4a

Magnetic anisotropy manipulation of the femtosecond laser-excited spin wave modes in full-Heusler Co₂Fe_1-x Mn _x Al films

J Phys Condens Matter. 2018 Dec 5;30(48):485802. doi: 10.1088/1361-648X/aaea4a.

Authors

S F Li¹, K K Meng, C Y Cheng, J H Zhao, T S Lai

Affiliation

¹ State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, Guangdong 510275, People's Republic of China. College of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang, Guangdong 524000, People's Republic of China.

PMID: 30422816
DOI: 10.1088/1361-648X/aaea4a

Abstract

Spin-wave dynamics in full-Heusler Co₂Fe_1-x Mn _x Al films have been investigated using all-optical pump-probe magneto-optical polar Kerr spectroscopy. We find magnetic damping and anisotropy can be modulated by composition x. Damon-Eshbach (DE) spin wave occurs only in the samples which present intrinsic magnetic damping and have huge uniaxial magnetic anisotropy, implying that intrinsic magnetic damping and huge uniaxial magnetic anisotropy is the necessary conditions to excite coherent DE spin wave. Kittel spin wave appears in low uniaxial magnetic anisotropic samples and presents extrinsic magnetic damping. Therefore, laser-excited spin-wave modes can be manipulated by magnetic anisotropy, whose physical picture is discussed phenomenologically.