Dzyaloshinskii-Moriya interaction in α-Fe2O3 measured by magnetic circular dichroism in resonant inelastic soft x-ray scattering
Dzyaloshinskii-Moriya interaction in α-Fe2O3 measured by magnetic circular dichroism in resonant inelastic soft x-ray scattering
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DOI：
10.1103/physrevb.96.214420
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发表时间：
2017-12-14
影响因子：
3.7
通讯作者：
Harada, Yoshihisa
中科院分区：
文献类型：
--
作者：
Miyawaki, Jun;Suga, Shigemasa;Harada, Yoshihisa
Fe L-2,L-3-edge x-ray absorption spectra (XAS) and magnetic circular dichroism (MCD) in resonant inelastic x-ray scattering (RIXS) of alpha-Fe2O3 were measured to identify the electronic structure responsible for its weak ferromagnetism caused by the Dzyaloshinskii-Moriya interaction (DMI) at room temperature. In contrast to negligible MCD in XAS, MCD in RIXS (RIXS-MCD) was clearly observed in the dd excitation at 1.8 eV via excitation to charge-transfer states. Furthermore, RIXS-MCD showed a crystal orientation dependence, indicating that the observed RIXS-MCD originated from DMI. The observed RIXS-MCD is well described by ab initio charge-transfer multiplet calculations, revealing that the RIXS-MCD derives from spin flip excitations at delocalized e(g) orbitals. By the combination of the experiments and calculations, RIXS-MCD has unraveled that the origin of DMI in alpha-Fe2O3 is the e(g) orbitals, which are strongly hybridized with the 2p orbitals of oxygen atoms. The results demonstrate the importance of RIXS-MCD for identifying the electronic structure related to DMI.
