Journal
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Volume 53, Issue 2, Pages 758-762Publisher
KOREAN PHYSICAL SOC
DOI: 10.3938/jkps.53.758
Keywords
rare-earth orthoferrite; canted antiferromagnet; weak ferromagnetism
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Funding
- Korea Science and Engineering Foundation (KOSEF) [R012007-000-11188-0]
- electron Spin Science Center (eSSC) at Pohang University of Science and Technology (POSTECH)
- POSTECH research fund
- BK21 program
- National Research Foundation of Korea [핵06A2805, 과06A1105, R01-2007-000-11188-0, R11-2000-071-13001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The magnetic properties of the single-crystalline orthoferrites TbFeO3 and ErFeO3 were investigated by using a vibrating sample magnetometer (VSM). Both ferrites exhibit weak ferromagnetism with the maximum saturated moment being 0.125 and 0.054 mu(B)/Fe for TbFeO3 and ErFeO3, respectively. We confirmed the spin reorientation transition (SRT) in both systems. These two ferrites display different temperature-dependent behaviors of the magnetization, which we analyzed within the molecular field model. The results suggest that the Fe 3d-Er 4f magnetic coupling through the molecular field of the ordered Fe net moment is unexpectedly antiferromagnetism, opposite to the ferromagnetic Fe 3d-Tb 4f coupling. Further, the coupling widely varies with temperature and/or with the SRT, indicating that the Tb/Er moment is not simply explained by the partial polarization of the paramagnetic spins experiencing the molecular field of the net Fe moment.
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