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Ultrafast Photoinduced Multimode Antiferromagnetic Spin Dynamics in Exchange‐Coupled Fe/RFeO 3 (R = Er or Dy) Heterostructures
Author(s) -
Tang Jin,
Ke Yajiao,
He Wei,
Zhang Xiangqun,
Zhang Wei,
Li Na,
Zhang Yongsheng,
Li Yan,
Cheng Zhaohua
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201706439
Subject(s) - antiferromagnetism , orthoferrite , condensed matter physics , spintronics , materials science , ferromagnetism , ultrashort pulse , magnetization , exchange interaction , spin (aerodynamics) , physics , optics , laser , magnetic field , quantum mechanics , thermodynamics
Antiferromagnetic spin dynamics is important for both fundamental and applied antiferromagnetic spintronic devices; however, it is rarely explored by external fields because of the strong exchange interaction in antiferromagnetic materials. Here, the photoinduced excitation of ultrafast antiferromagnetic spin dynamics is achieved by capping antiferromagnetic RFeO 3 (R = Er or Dy) with an exchange‐coupled ferromagnetic Fe film. Compared with antiferromagnetic spin dynamics of bare RFeO 3 orthoferrite single crystals, which can be triggered effectively by ultrafast laser heating just below the phase transition temperature, the ultrafast photoinduced multimode antiferromagnetic spin dynamic modes, for exchange‐coupled Fe/RFeO 3 heterostructures, including quasiferromagnetic resonance, impurity, coherent phonon, and quasiantiferromagnetic modes, are observed in a temperature range of 10–300 K. These experimental results not only offer an effective means to trigger ultrafast antiferromagnetic spin dynamics of rare‐earth orthoferrites, but also shed light on the ultrafast manipulation of antiferromagnetic magnetization in Fe/RFeO 3 heterostructures.