X-ray magnetic circular dichroism and hard X-ray photoelectron spectroscopy of tetragonal Mn₇₂Ge₂₈epitaxial thin film

Abstract

An epitaxially grown Mn 72 Ge 28 film with a tetragonal crystal structure was fabricated. It was clarified that the film had a perpendicular magnetization and a high perpendicular magnetic anisotropy energy of 14.3 Merg/cm 3 . The electronic structure was investigated by X-ray magnetic circular dichroism and hard X-ray photoelectron spectroscopy. The obtained X-ray magnetic circular dichroism spectrum revealed that the Mn orbital magnetic moment governed the magnetocrystalline anisotropy of the Mn 72 Ge 28 film. A doublet structure was observed for the Mn 2p 3/2 peak of hard X-ray photoelectron spectrum, indicating the spin exchange interaction between the 2p core-hole and 3d valence electrons.

Control of anomalous Nernst effect in spintronic materials

“…On the other hand, manganesebased L1 0 and Al 3 Ti (D0 22 )-type ordered alloys such as MnGa and MnGe are also known to have large uniaxial magnetic anisotropy, whereas they have small saturation magnetization and small Gilbert damping constants. [36][37][38][39][40] These characteristics are advantageous for application to spin transfer torque random access memory.…”

Structural and Magnetic Properties of Mn3Ge Grown on a Thin Polycrystalline MgO Seed Layer

“…Direct observation of the lattice structure by TEM like in Figure d is impossible due to the polycrystallinity of the PVD Mn 3 Ge films. Techniques like X‐ray magnetic circular dichroism and hard X‐ray photoelectron spectroscopy might be relied on for the aforementioned studies . Ab initio calculation of the D 0 22 and L 1 2 phase of Mn 3 Ge can also help to investigate the absence of PMA in PVD Mn 3 Ge.…”