Magnetization Process of the n-type Ferromagnetic Semiconductor (In,Fe)As:Be Studied by X-ray Magnetic Circular Dichroism

Abstract

In order to investigate the mechanism of ferromagnetic ordering in the new n-type magnetic semiconductor (In,Fe)As co-doped with Be, we have performed X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) studies of ferromagnetic and paramagnetic samples. The spectral line shapes suggest that the ferromagnetism is intrinsic originating from Fe atoms incorporated into the Zinc-blende-type InAs lattice. The magnetization curves of Fe measured by XMCD were well reproduced by the superposition of a Langevin function representing superparamagnetic (SPM) behavior of nano-scale ferromagnetic domains and a T-linear function representing Curie-Weiss paramagnetism even much above the Curie temperatures. The data at 20 K showed a deviation from the Langevin behavior, suggesting a gradual establishment of macroscopic ferromagnetism on lowering temperature. The existence of nano-scale ferromagnetic domains indicated by the SPM behavior suggests spatial fluctuations of Fe concentration on the nano-scale.

References in corpus (7)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Origin and control of high-temperature ferromagnetism in semiconductors
• Spinodal nanodecomposition in magnetically doped semiconductors
• Impurity Band Conduction in a High Temperature Ferromagnetic Semiconductor
• 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
• Spin and orbital magnetic moments of Fe in the $n$-type ferromagnetic semiconductor (In,Fe)As

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• Anisotropic spin distribution and perpendicular magnetic anisotropy in the layered ferromagnetic semiconductor (Ba,K)(Zn,Mn)${}_2$As${}_2$
• Nematicity of correlated systems driven by anisotropic chemical phase separation
• Densities of states in Fe-doped III-V semiconductors: a first-principles study
• Magnetization process of the insulating ferromagnetic semiconductor (Al,Fe)Sb
• Effect(s) of Cobalt Substitution in $L{1}_0$-(Fe,Co)Pt Thin Films
• 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
• Temperature evolution of magnetic phases near the thickness-dependent metal-insulator transition in La${}_{1-x}$Sr${}_x$MnO${}_3$ thin films observed by XMCD