Magnetic structure and phase transition at the surface region of Fe3O4(100)
Magnetic structure and phase transition at the surface region of Fe3O4(100)
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DOI：
10.1088/2399-6528/abc8da
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发表时间：
2020-11-01
影响因子：
1.2
通讯作者：
Fukutani, Katsuyuki
中科院分区：
文献类型：
--
作者：
Kawauchi, Taizo;Miura, Yoshio;Fukutani, Katsuyuki
用Fe-57转换电子穆斯堡尔谱(CEMS)和理论计算研究了Fe_3O_4(100)近表面区的磁结构和相变。结果表明，在300K时，表面磁化强度为面内磁化强度，深部磁化强度从面内倾斜到111>；方向，表明存在非共线磁结构。四面体和八面体中心的临界指数分别为0.24+/-0.01和0.28+/-0.01。此外，在临界温度附近，表面区的磁化方向偏离了面内方向。
The magnetic structure and phase transition of the near-surface region of Fe3O4(100) was investigated by Fe-57 conversion electron Mossbauer spectroscopy (CEMS) and theoretical calculations. It is revealed that at 300 K the magnetization is in-plane in the surface region and cants from the in-plane to the < 111> direction in a deeper region suggesting the presence of a noncollinear magnetic structure. The critical exponents for the tetrahedral and octahedral sites are estimated to be 0.24 +/- 0.01 and 0.28 +/- 0.01, respectively. Near the critical temperature, furthermore, the magnetization direction in the surface region was found to deviate from the in-plane direction.