Spin and orbital magnetic moments of Fe in the $n$-type ferromagnetic semiconductor (In,Fe)As

Abstract

The electronic and magnetic properties of Fe atoms in the ferromagnetic semiconductor (In,Fe)As codoped with Be have been studied by x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) at the Fe $L_{2,3}$ edge. The XAS and XMCD spectra showed simple spectral line shapes similar to Fe metal, but the ratio of the orbital and spin magnetic moments ($M_{\mathrm{orb}}$/$M_{\mathrm{spin}}$) estimated using the XMCD sum rules was significantly larger than that of Fe metal, indicating a significant orbital moment of Fe $3d$ electrons in (In,Fe)As:Be. The positive value of $M_{\mathrm{orb}}$/$M_{\mathrm{spin}}$ implies that the Fe $3d$ shell is more than half-filled, which arises from the hybridization of the Fe${}^{3+}$ ($d^5$) state with the charge-transfer $d^6\underline{L}$ states, where $\underline{L}$ is a ligand hole in the host valence band. The XMCD intensity as a function of magnetic field indicated hysteretic behavior of the superparamagnetic-like component due to discrete ferromagnetic domains.

4 pages, 2 figures, 1 table

References in corpus (4)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Characterization of Magnetic Components in the Diluted Magnetic Semiconductor Zn${}_{1-x}$Co${}_x$O by X-ray Magnetic Circular Dichroism
• Crystalline anisotropic magnetoresistance with two-fold and eight-fold symmetry in (In,Fe)As ferromagnetic semiconductor
• Nature of magnetic coupling between Mn ions in as-grown Ga${}_{1-x}$Mn${}_x$As studied by x-ray magnetic circular dichroism

Cited by in corpus (3)

• Minority-Spin Impurity Band in n-Type (In,Fe)As: A Materials Perspective for Ferromagnetic Semiconductors
• Ferromagnetism induced by hybridization of Fe 3d orbitals with ligand InSb bands in n-type ferromagnetic semiconductor (In,Fe)Sb
• Development of magnetism in Fe-doped magnetic semiconductors: Resonant photoemission and x-ray magnetic circular dichroism studies of (Ga,Fe)As