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Title: Laser-induced THz magnetization precession for a tetragonal Heusler-like nearly compensated ferrimagnet

Laser-induced magnetization precessional dynamics was investigated in epitaxial films of Mn{sub 3}Ge, which is a tetragonal Heusler-like nearly compensated ferrimagnet. The ferromagnetic resonance (FMR) mode was observed, the precession frequency for which exceeded 0.5 THz and originated from the large magnetic anisotropy field of approximately 200 kOe for this ferrimagnet. The effective damping constant was approximately 0.03. The corresponding effective Landau-Lifshitz constant is approximately 60 Mrad/s and is comparable with those of the similar Mn-Ga materials. The physical mechanisms for the Gilbert damping and for the laser-induced excitation of the FMR mode were also discussed in terms of the spin-orbit-induced damping and the laser-induced ultrafast modulation of the magnetic anisotropy, respectively.
Authors:
; ; ;  [1] ; ;  [2]
  1. WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
  2. Department of Applied Physics, Tohoku University, Sendai 980-8579 (Japan)
Publication Date:
OSTI Identifier:
22489245
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; APPROXIMATIONS; DAMPING; EPITAXY; EXCITATION; FERROMAGNETIC RESONANCE; FILMS; MAGNETIZATION; MATERIALS; MODULATION; PRECESSION; SPIN