Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO 3 heterostructure

We investigate the ultrafast spin dynamics of an antiferromagnet in a ferromagnet/antiferromagnet heterostructure Fe/GdFeO 3 via an all-optical method. After laser irradiation, the terahertz spin precession is hard to be excited in a bare GdFeO 3 without spin reorientation phase but efficiently in F...

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Published inChinese physics B Vol. 30; no. 11; p. 117502
Main Authors Li, Na, Tang, Jin, Su, Lei, Ke, Ya-Jiao, Zhang, Wei, Xie, Zong-Kai, Sun, Rui, Zhang, Xiang-Qun, He, Wei, Cheng, Zhao-Hua
Format Journal Article
LanguageEnglish
Published 01.11.2021
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Summary:We investigate the ultrafast spin dynamics of an antiferromagnet in a ferromagnet/antiferromagnet heterostructure Fe/GdFeO 3 via an all-optical method. After laser irradiation, the terahertz spin precession is hard to be excited in a bare GdFeO 3 without spin reorientation phase but efficiently in Fe/GdFeO 3 . Both quasi-ferromagnetic and impurity modes, as well as a phonon mode, are observed. We attribute it to the optical modification of interfacial exchange coupling between Fe and GdFeO 3 . Moreover, the excitation efficiency of dynamics can be modified significantly via the pump laser influence. Our results elucidate that the interfacial exchange coupling is a feasible stimulation to efficiently excite terahertz spin dynamics in antiferromagnets. It will expand the exploration of terahertz spin dynamics for antiferromagnet-based opto-spintronic devices.
ISSN:1674-1056
DOI:10.1088/1674-1056/abf3b7