Magnetism and Mn Clustering in (In,Mn)Sb Magnetic Semiconductors

Abstract

Previously, high-temperature ferromagnetism with a Curie temperature in excess of 400 K was reported in the magnetic semiconductor (In,Mn)Sb films grown by metal-organic vapor phase epitaxy (MOVPE). To determine the role of Mn distribution on its magnetic properties, the Mn 2p core-level X-ray photoelectron spectroscopy (XPS) of (In,Mn)Sb films was measured. For films grown on an InSb substrate, Mn composition is spatially inhomogeneous and its concentration increases with increasing deposition temperature. Spin-orbit splitting energy of the Mn 2p core-level was found to increase with increasing Mn concentration. From the dependence of the measured spin-orbit splitting energy on the Mn concentration, evidence of atomic-scale Mn cluster formation was observed. The measured magnetic moment per Mn atom decreases from 3.0 μB/Mn to 1.8 μB/Mn with increasing Mn concentration, which is attributed to atomic-scale clusters that are ferromagnetic or ferrimagnetic. This detailed investigation gives an insight into the Mn distribution, phase composition and origin of magnetism in MOVPE-grown (In,Mn)Sb magnetic thin films.

Phase Transition Engineering of Cu2S to Widen the Temperature Window of Improved Thermoelectric Performance

“…By looking into the high‐resolution XPS spectra for Mn 2p and Mn 3s core states, we can determine the chemical state of Mn in Cu 1.95 Mn 0.03 S. As shown in Figure d, the Mn 2p spectrum shows two peaks at 641.4 eV (Mn 2p 3/2 ) and 653.2 eV (Mn 2p 1/2 ) due to spin–orbit coupling . The satellite peak of Mn 2p 3/2 was also observed at 646.8 eV, which is characteristic of Mn 2+ .…”

“…The experimental curves were fitted using mixed Gaussian–Lorentzian functions (83% Gaussian and 17% Lorentzian) for the peak profiles. The ratio of different valence of the same element was estimated from the areas under each deconvoluted peaks after profile fitting …”

Quantization in magnetoresistance of strained InSb whiskers

“…Compressively-strained bulk InSb demonstrated the highest hole mobility close to 1000 cm 2 /(V•s) at room temperature [7]. Negative magnetoresistance (NMR) corresponding to different mechanisms of charge carrier scattering was found in such material as InSb at weak magnetic fields and lowtemperature range [10][11][12][13][14][15][16][17][18][19]. NMR phenomena with strong spin-orbital coupling gaps were revealed in topological semimetals [10].…”

Magnetotransport properties of InSb-MnSb nanostructured films

“…They demonstrate ferromagnetism and spin-depended scattering above the room temperature. An influence of the ferromagnetic MnSb inclusions on magnetic and electrical properties of InSb/MnSb nanostructures was observed both in bulk [15][16][17] and in films [18,19].…”