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Title: Non-thermal optical excitation of terahertz-spin precession in a magneto-optical insulator

We demonstrate non-thermal ultrafast laser excitation of spin precession with THz frequency in Gd-Bi-substituted iron garnet via the inverse Faraday effect. The modulation of THz precession by about 60 GHz below the compensation temperature of magnetic moment was observed. The THz frequency precession was caused by the exchange resonance between the Gd and Fe sublattices; we attributed the low-frequency modulation to dielectric resonance mode with a magnetic contribution. We demonstrate the possibility of polarization-sensitive control of spin precession under THz generation by laser pulses, helping to develop high-speed magneto-optical devices.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Laboratory of Magnetism, Faculty of Physics, University of Bialystok, 15-245 Bialystok (Poland)
  2. Department of Physics, Kyushu University, 819-0395 Fukuoka (Japan)
  3. Institute of Industrial Science, The University of Tokyo, 153-8505 Tokyo (Japan)
  4. Institute of Molecular Physics Polish Academy of Sciences, 60-179 Poznan (Poland)
Publication Date:
OSTI Identifier:
22489320
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 3; 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; DIELECTRIC MATERIALS; EXCITATION; FARADAY EFFECT; FERRITE GARNETS; FREQUENCY MODULATION; GHZ RANGE; LASERS; MAGNETIC MOMENTS; POLARIZATION; PRECESSION; PULSES; RESONANCE; SPIN