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Yusuke Kimata, Momoko Okabe, Toru Asaka, Koichiro Fukuda, B23-P-03
Lorentz electron microscopy study on an X-type hexaferrite , Microscopy, Volume 64, Issue suppl_1, November 2015, Page i113, https://doi.org/10.1093/jmicro/dfv277Close - Share Icon Share
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Materials that exhibit a (giant) magnetoelectric effect have been extensively studied as the typical materials having cross-correlation properties arising due to coupling between magnetism and electric properties. Recently, the magnetoelectric effect under relatively low magnetic fields at room temperature (R. T.) was reported in a Z-type hexaferrite [ 1 ]. This discovery renewed interest in the magnetic hexafenites. Although, the magnetoelectric effects in most types of the hexaferrites have been tested, no study on an X-type hexaferrite was reported, as far as we know. We investigated the magnetic domain structures in the X-type hexaferrite (Sr 2 CO 2 Fe 28 O 46 ) relevant to the magnetic anisotropy as well as the magnetoelectric effect by Lorentz electron microscopy.
We observed magnetic domains extending almost perpendicular to the c axis at R. T. This suggests that Sr 2 CO 2 Fe 28 O 46 exhibits a spontaneous magnetization and the easy direction of magnetization is parallel to the ab plane. With increasing temperature, we observed a spin-reorientation transition where the easy direction of magnetization rotates from the ab plane to parallel to the c axis. Moreover, we observed magnetic nanoclusters embedded on the 180-degree domains at low temperatures, as shown in Fig. 1 . This extraordinary state would cause a cluster-glass like behavior observed in Sr 2 CO 2 Fe 28 O 46 .
