Circularly polarized soft x-ray diffraction study of helical magnetism in hexaferrite
Circularly polarized soft x-ray diffraction study of helical magnetism in hexaferrite
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六方铁氧体螺旋磁性的圆偏振软X射线衍射研究
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
C. Ling
中科院分区：
文献类型：
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作者：
A. Mulders;A. Mulders;Sm M. Lawrence;AJ Princep;U. Staub;Y. Bodenthin;M. García;M. Garganourakis;J. Hester;R. Macquart;C. Ling;C. Ling
磁螺旋结构可以表现出铁电矩，最近在各种多铁性材料中证明。在这种情况下，磁螺旋的螺旋度与铁电矩的方向直接相关，并且磁结构的螺旋度的测量是当前感兴趣的。软X射线共振衍射是特别有利的，因为它结合了元素选择性与大的磁截面。我们计算了六角铁氧体Ba0.8Sr1.2Zn2Fe12O22中基面磁螺旋的共振磁x射线截面（电偶极跃迁）的偏振依赖性，并利用圆偏振入射辐射推导出其畴布居。我们证明了衍射辐射和磁螺线的螺旋度之间有直接的相关性。
Magnetic spiral structures can exhibit ferroelectric moments as recently demonstrated in various multiferroic materials. In such cases the helicity of the magnetic spiral is directly correlated with the direction of the ferroelectric moment and measurement of the helicity of magnetic structures is of current interest. Soft x-ray resonant diffraction is particularly advantageous because it combines element selectivity with a large magnetic cross-section. We calculate the polarization dependence of the resonant magnetic x-ray cross-section (electric dipole transition) for the basal plane magnetic spiral in hexaferrite Ba0.8Sr1.2Zn2Fe12O22 and deduce its domain population using circular polarized incident radiation. We demonstrate there is a direct correlation between the diffracted radiation and the helicity of the magnetic spiral.