Observation of collinear antiferromagnetic domains making use of the circular dichroic charge-magnetic interference effect of resonant x-ray diffraction
Observation of collinear antiferromagnetic domains making use of the circular dichroic charge-magnetic interference effect of resonant x-ray diffraction
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DOI：
10.1103/physrevb.98.134415
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发表时间：
2018-10
影响因子：
3.7
通讯作者：
H. Ueda;Yoshikazu Tanaka;Y. Wakabayashi;T. Kimura
中科院分区：
文献类型：
--
作者：
H. Ueda;Yoshikazu Tanaka;Y. Wakabayashi;T. Kimura
报道了反铁磁（AFM）材料在共振x射线衍射（RXD）中的圆二向色电荷-磁干涉效应。推导了散射截面的偏振依赖关系，阐明了干涉产生AFM材料圆二向色RXD信号的条件。利用干涉效应，可以在一定条件下区分出一对AFM畴。我们应用这一效应观察了高温磁电六铁体$\mathrm{B}{\mathrm{a}}_{1.3}\mathrm{S}{\mathrm{r}}_{0.7}\mathrm{CoZnF}{\mathrm{e}}_{11}\mathrm{Al}{\mathrm{O}}_{22}$中的共线手性AFM畴。尽管其共线自旋排列和缺乏宏观磁化，但通过圆偏振x射线束可以清楚地看到畴。本研究结果表明，利用电荷-磁干扰效应可以检测包括共线结构在内的各种AFM结构域，以及由纯磁散射产生的RXD的圆二色性。
The circular dichroic charge-magnetic interference effect in resonant x-ray diffraction (RXD) is reported for antiferromagnetic (AFM) materials. The polarization dependence of the scattering cross-section was formulated, and the conditions that the interference gives rise to circular dichroic RXD signals for AFM materials were clarified. By using the interference effect, a pair of AFM domains can be distinguished in certain conditions. We applied this effect to observe collinear chirality AFM domains in a high-temperature magnetoelectric hexaferrite, $\mathrm{B}{\mathrm{a}}_{1.3}\mathrm{S}{\mathrm{r}}_{0.7}\mathrm{CoZnF}{\mathrm{e}}_{11}\mathrm{Al}{\mathrm{O}}_{22}$. Despite its collinear spin arrangement and absence of macroscopic magnetization, the domains are clearly visualized by a circularly polarized x-ray beam. The present result shows that various types of AFM domains including collinear ones can be examined by utilizing the charge-magnetic interference effect, together with the well-established circular dichroism on RXD emerged from pure magnetic scattering.