论文标题
Fe 3D轨道与N型铁电磁半导体（IN，Fe）SB中的配体INSB带杂交引起的铁磁磁学
Ferromagnetism induced by hybridization of Fe 3d orbitals with ligand InSb bands in n-type ferromagnetic semiconductor (In,Fe)Sb
论文作者
论文摘要
Fe掺杂的III-V铁磁半导体（FMS）（IN，Fe）SB是一种有前途的自旋装置应用的材料，因为N型载体传导和具有较高居里温度（TC> 300 K）的铁磁性。为了阐明高-TC铁磁磁性的机制，我们通过执行X射线吸收光谱（XAS）和X射线磁性圆形二色性（XAS）测量，研究了（IN，Fe）SB薄膜的电子结构和磁性。 XMCD光谱的磁场依赖性表明，（in，fe）SB薄膜中存在类似铁磁的Fe和类似顺磁性的Fe成分。铁磁性和顺磁性的Fe成分的XAS和XMCD光谱分别类似于其他Fe掺杂的FMS和外在氧化物的成分。通过应用XMCD总规则估计的轨道和自旋磁矩之间的比率有限值表明，代替（IN，Fe）SB代替的Fe离子的价状态并非纯离离子Fe3+，而是Fe3+和Fe2+之间的中间体。可见光的磁圆二色性强度与XMCD强度的磁场依赖性之间的质量对应关系表明，INSB频带的zeeman分裂与掺杂的Fe的净磁化成正比。这些结果表明（IN，Fe）SB的铁磁作起源于Fe 3D轨道与宿主INSB带杂交的轨道。
Fe-doped III-V ferromagnetic semiconductor (FMS) (In,Fe)Sb is a promising material for spintronic device applications because of the n-type carrier conduction and the ferromagnetism with high Curie temperature (TC > 300 K). To clarify the mechanism of the high-TC ferromagnetism, we have investigated the electronic structure and magnetic properties of an (In,Fe)Sb thin film by performing x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) measurements at the Fe L2,3 edges. The magnetic-field dependence of the XMCD spectra reveals that there are ferromagnetic-like Fe and paramagnetic-like Fe components in the (In,Fe)Sb thin film. The XAS and XMCD spectra of the ferromagnetic-like and paramagnetic-like Fe components resemble those of other Fe-doped FMSs and extrinsic oxides, respectively. The finite value of the ratio between the orbital and spin magnetic moments estimated by applying the XMCD sum rules indicates that the valence state of the Fe ions substituting for the In sites in (In,Fe)Sb is not purely ionic Fe3+, but intermediate between Fe3+ and Fe2+. The qualitative correspondence between the magnetic-field dependence of the visible-light magnetic circular dichroism intensity and that of the XMCD intensity demonstrates that the Zeeman splitting of the InSb band is proportional to the net magnetization of the doped Fe. These results suggest that the ferromagnetism of (In,Fe)Sb originates from the Fe 3d orbitals hybridized with the host InSb bands.
