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arXiv 2004.11589cond-mat.mes-hall
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单轴磁铁中磁畴的小角电子衍射和傅科成像观测

Observation of magnetic domains in uniaxial magnets via small-angle electron diffraction and Foucault imaging

Hiroshi Nakajima, Atsuhiro Kotani, Ken Harada, Shigeo Mori

摘要:

磁畴的观测对于理解磁性材料和器件的磁性能是重要的。在这项研究中,我们报告的磁畴的M型六角铁氧体单轴各向异性可以通过小角度电子衍射和傅科成像可视化。衍射图案斑点的位置具有与Sc取代的六角铁氧体(BaFe $_{12-x-δ}$ Sc $_x$ Mg $_δ$ O $_{19}$)中的磁畴相同的周期。相反,观察到的斑点比没有取代的六角铁氧体(BaFe $_{12}$ O $_{19}$)中的磁畴的周期长四倍,证明了布洛赫壁的长程序。当样品倾斜时,会产生磁偏转效应,并出现周期性的磁畴斑点。因此,我们能够通过选择偏转点来可视化具有不同磁化方向和畴取向的磁畴。结果表明,本研究所采用的技术对单轴各向异性磁性材料的观测是有用的。

英文摘要:

Observation of magnetic domains is important in understanding the magnetic properties of magnetic materials and devices. In this study, we report that the magnetic domains of M-type hexaferrites with uniaxial anisotropy can be visualized via small-angle electron diffraction and Foucault imaging. The position of the diffraction pattern spots has the same period as that of magnetic domains in a Sc-substituted hexaferrite (BaFe$_{12-x-δ}$Sc$_x$Mg$_δ$O$_{19}$). Conversely, the spots were observed four times longer than the period of magnetic domains in hexaferrite without substitution (BaFe$_{12}$O$_{19}$), demonstrating the long-range order of the Bloch walls. When the specimen was tilted, the magnetic deflection effect, as well as the periodic spots of magnetic domains, occurred. Thus, we were able to visualize the magnetic domains with different magnetization directions and domain orientations by selecting deflection spots. The results indicate that the technique utilized in this study is useful in observing the magnetic materials with uniaxial anisotropy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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