Multiaxial magnetocrystalline anisotropy in the X -type hexaferrite Sr2Co2Fe28O46 at low temperature
| Autor: | Toru Asaka, Momoko Okabe, Koichiro Fukuda, Daisuke Urushihara, Mai Komabuchi, Yusuke Kimata |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical Review B. 100 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We investigated the correlation between the crystal structure and magnetism in ${\mathrm{Sr}}_{2}{\mathrm{Co}}_{2}{\mathrm{Fe}}_{28}{\mathrm{O}}_{46}$ using magnetic measurements and transmission electron microscopy. With changing temperature, the magnitude of the magnetization along the $[2\overline{1}\overline{1}0]$ and $[01\overline{1}0]$ directions changed drastically at $\ensuremath{\sim}340$ K, whereas that along the [0001] direction remained almost unchanged, suggesting a spin reorientation transition. The field dependence of the magnetization along $[2\overline{1}\overline{1}0]$ exhibited characteristic stepwise behavior below 150 K, whereas that along $[01\overline{1}0]$ did not exhibit this behavior, which suggests unusual magnetic anisotropy within the (0001) plane. Evaluation of the magnetic domain structures revealed that ${\mathrm{Sr}}_{2}{\mathrm{Co}}_{2}{\mathrm{Fe}}_{28}{\mathrm{O}}_{46}$ exhibits strong axial magnetocrystalline anisotropy with the axis along the direction tilted by $\ensuremath{\sim}{60}^{\ensuremath{\circ}}$ from the [0001] direction toward the $[01\overline{1}0]$ direction at low temperatures. This anisotropy along a nonunique crystallographic direction results in multiaxial anisotropy because of the crystal symmetry. |
| Databáze: | OpenAIRE |
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