Shin, Im-Hyuk Min, Byoung-Chul Ju, Byeong-Kwon Choi, Gyung-Min 2024-01-19T22:01:19Z 2024-01-19T22:01:19Z 2021-09-03 2018-09 0021-4922 https://pubs.kist.re.kr/handle/201004/120956 The ultrafast demagnetization of metallic ferromagnets can generate a spin current in metallic nonmagnets in a ferromagnet/nonmagnet structure. Two different mechanisms for this phenomenon have been suggested: spin-dependent transport of hot electrons and spin generation by electron-magnon scattering. In this work, we optically measure a transient spin accumulation on a nonmagnetic Cu layer driven by the ultrafast demagnetization of a ferromagnet (Fe, Co, and Ni). The modeling based on the spin generation by electron-magnon scattering in bulk ferromagnets (namely, bulk spin pumping) well explains the dynamics and magnitude of the measured spin accumulation on Cu. (c) 2018 The Japan Society of Applied Physics English IOP PUBLISHING LTD Ultrafast spin current generated by electron-magnon scattering in bulk of ferromagnets Article 10.7567/JJAP.57.090307 1 JAPANESE JOURNAL OF APPLIED PHYSICS, v.57, no.9 JAPANESE JOURNAL OF APPLIED PHYSICS 57 9 scie scopus 000440593100001 2-s2.0-85053405567 Physics, Applied Physics Article TRANSFER TORQUE DRIVEN GIANT MAGNETORESISTANCE METALLIC MULTILAYERS DEMAGNETIZATION MAGNETIZATION VALVES INJECTION DYNAMICS