Magnetization states of canted antiferromagnetic YFeO3 investigated by terahertz time-domain spectroscopy

We investigate magnetization states of a canted antiferromagnetic YFeO3 by using terahertz (THz) time-domain spectroscopy under a variation of an external magnetic field. As a quasi-ferromagnetic mode near 0.3 THz is excited by the magnetic field of the THz pulse, a precession of the magnetic moment...

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Bibliographic Details
Published in:Journal of applied physics 2015-12, Vol.118 (23)
Main Authors: Kim, T. H., Kang, C., Kee, C.-S., Lee, J.-H., Cho, B. K., Gruenberg, P., Tokunaga, Y., Tokura, Y., Lee, J. S.
Format: Article
Language:English
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Summary:We investigate magnetization states of a canted antiferromagnetic YFeO3 by using terahertz (THz) time-domain spectroscopy under a variation of an external magnetic field. As a quasi-ferromagnetic mode near 0.3 THz is excited by the magnetic field of the THz pulse, a precession of the magnetic moment and its induction decay radiate the THz wave. Since oppositely aligned magnetic domains emit the circularly/elliptically polarized THz waves with opposite helicities, a detection of specific polarization of the THz wave shows a clear hysteresis behavior in good agreement with a magnetization curve obtained as a function of the applied magnetic field. Furthermore, time-domain measurement of excited magnetic moment can provide direct information about the magnetization decay dynamics.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4937158