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

Journal Article · Mon Jan 18 00:00:00 EST 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4940241· OSTI ID:22489320

Parchenko, Sergii; Maziewski, Andrzej; Stupakiewicz, Andrzej ^[1]; Satoh, Takuya ^[2]; Yoshimine, Isao ^[3]; Stobiecki, Feliks ^[4]

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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)

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.

• OSTI ID: 22489320
• Journal Information: Applied Physics Letters, Vol. 108, Issue 3; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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