Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO3 heterostructure

doi:10.1088/1674-1056/abf3b7

中国物理B ›› 2021, Vol. 30 ›› Issue (11): 117502-117502.doi: 10.1088/1674-1056/abf3b7

Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO₃ heterostructure

Na Li(李娜)^1,2, Jin Tang(汤进)^1,2, Lei Su(苏磊)^1,2, Ya-Jiao Ke(柯亚娇)^1,2, Wei Zhang(张伟)^1,2, Zong-Kai Xie(谢宗凯)^1,2, Rui Sun(孙瑞)^1,2, Xiang-Qun Zhang(张向群)¹, Wei He(何为)¹, and Zhao-Hua Cheng(成昭华)^1,2,3,†

1 State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

收稿日期:2021-03-16 修回日期:2021-03-27 接受日期:2021-03-31 出版日期:2021-10-13 发布日期:2021-10-13
通讯作者: Zhao-Hua Cheng E-mail:zhcheng@iphy.ac.cn
基金资助:
Project supported by the National Key Research Program of China (Grant Nos. 2018YFF01010303, 2017YFB0702702, and 2016YFA0300701), the National Natural Sciences Foundation of China (Grant Nos. 52031015, 1187411, 51427801, and 51871235), and the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant Nos. QYZDJ-SSW-JSC023, KJZD-SW-M01, and ZDYZ2012-2).

Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO₃ heterostructure

1 State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

Received:2021-03-16 Revised:2021-03-27 Accepted:2021-03-31 Online:2021-10-13 Published:2021-10-13
Contact: Zhao-Hua Cheng E-mail:zhcheng@iphy.ac.cn
Supported by:
Project supported by the National Key Research Program of China (Grant Nos. 2018YFF01010303, 2017YFB0702702, and 2016YFA0300701), the National Natural Sciences Foundation of China (Grant Nos. 52031015, 1187411, 51427801, and 51871235), and the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant Nos. QYZDJ-SSW-JSC023, KJZD-SW-M01, and ZDYZ2012-2).

摘要/Abstract

摘要： We investigate the ultrafast spin dynamics of an antiferromagnet in a ferromagnet/antiferromagnet heterostructure Fe/GdFeO₃ via an all-optical method. After laser irradiation, the terahertz spin precession is hard to be excited in a bare GdFeO₃ without spin reorientation phase but efficiently in Fe/GdFeO₃. 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 GdFeO₃. 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.

关键词: ultrafast magnetization dynamics, antiferromagnetics, magnetic oxides, magnetization dynamics

Abstract: We investigate the ultrafast spin dynamics of an antiferromagnet in a ferromagnet/antiferromagnet heterostructure Fe/GdFeO₃ via an all-optical method. After laser irradiation, the terahertz spin precession is hard to be excited in a bare GdFeO₃ without spin reorientation phase but efficiently in Fe/GdFeO₃. 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 GdFeO₃. 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.

Key words: ultrafast magnetization dynamics, antiferromagnetics, magnetic oxides, magnetization dynamics

中图分类号: (Ultrafast magnetization dynamics and switching)

75.78.Jp

75.78.-n (Magnetization dynamics) 75.50.Ee (Antiferromagnetics) 75.47.Lx (Magnetic oxides)

Na Li(李娜), Jin Tang(汤进), Lei Su(苏磊), Ya-Jiao Ke(柯亚娇), Wei Zhang(张伟), Zong-Kai Xie(谢宗凯), Rui Sun(孙瑞), Xiang-Qun Zhang(张向群), Wei He(何为), and Zhao-Hua Cheng(成昭华). Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO₃ heterostructure[J]. 中国物理B, 2021, 30(11): 117502-117502.

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Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO₃ heterostructure

Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO₃ heterostructure

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