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Author Suemoto, Tohru ♦ Nakamura, Keita ♦ Kurihara, Takayuki ♦ Watanabe, Hiroshi
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ABSORPTION ♦ ANISOTROPY ♦ ANTIFERROMAGNETISM ♦ DOMAIN STRUCTURE ♦ MAGNETIC FIELDS ♦ MAGNETIC MOMENTS ♦ MAGNETIZATION ♦ PHASE TRANSFORMATIONS ♦ SPECTROSCOPY ♦ SPIN ♦ SPIN ORIENTATION ♦ TEMPERATURE DEPENDENCE
Abstract The spin orientation during spin reorientation phase transition in a weak ferromagnetic orthoferrite Dy{sub x}Er{sub 1−x}FeO{sub 3} (x = 0.7) has been studied by using terahertz time domain spectroscopy under zero and weak external magnetic fields. The spin orientation angle was deduced from the ratio of the absorption intensity of quasi-ferromagnetic and quasi-antiferromagnetic modes, which appear around 0.25 and 0.4 THz, respectively. Between 11.4 and 17.9 K, this material showed a rotation-type reorientation transition rather than Morin-type transition. The temperature and magnetic field dependence of the orientation angle of the magnetic moment was found to follow a simple model assuming a linear temperature dependence of the anisotropy parameter. It has been also shown that this method is insensitive to the domain structure with opposite polarity and that it allows measurement without macroscopic magnetization.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-07-27
Publisher Place United States
Journal Applied Physics Letters
Volume Number 107
Issue Number 4


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