Reorientation Phenomenon in a Magnetic Phase of ε-Fe_2O_3 Nanocrystal(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We observed an unusual magnetic phase transition in the magnetic phase of ε-Fe_2O_3 nanorods (Neel temperature=495K). In the cooling process at 1kOe, the magnetization value (M) of the ε-Fe_2O_3 phase decreased at 154K and then sharply decreased between T=115 and 70K. During the heating process, the M value returned to the original value at T=125K with a thermal hysteresis of 10K. This phase transition is accompanied by a decrease in coercive field from 21kOe (200K) to 0.6kOe (100K). This unusual magnetic phase transition is interpreted as a spin reorientation phenomenon due to the compensation between the magnetic dipole-dipole interaction and the single-ion anisotropy.
- 社団法人日本物理学会の論文
- 2005-07-15
著者
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Jin Jian
Department Of Applied Chemistry School Of Engineering The University Of Tokyo
-
Ohkoshi Shinichi
Department Of Applied Chemistry School Of Engineering The University Of Tokyo:presto Jst
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Hashimoto Kazuhito
Department Of Applied Chemistry Faculty Of Engineering The University Of Tokyo
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Sakurai Shunsuke
Department Of Applied Chemistry School Of Engineering The University Of Tokyo
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