Mechanism of ferromagnetism enhancement in a La_2/3 Sr_1/3 MnO₃ membrane released from epitaxial strain

2024/02/02 by Takeda, Takahito, Arai, Takuma, Yamagami, Kohei +4
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)

paper · doi:10.48550/arxiv.2402.01179

Abstract

Recent studies have shown that the magnetic properties of the ferromagnetic perovskite oxide La_2/3 Sr_1/3 MnO₃ (LSMO) grown on an SrTiO3 (STO) substrate, such as its magnetic moment and Curie temperature, can be improved by releasing the film from the substrate. However, the microscopic origin of this enhancement is not yet well understood. In this study, we use synchrotron radiation measurements to investigate the mechanism of ferromagnetism enhancement in an LSMO membrane released from an STO substrate by dissolving a water-soluble Sr₄Al₂O₇ buffer layer. Using resonant photoemission spectroscopy on the as-grown LSMO film and LSMO membrane, we elucidate that the strain release from the STO substrate enhances the itineracy of the Mn-3d electrons via p-d hybridization, and this strengthens the double-exchange interaction. The reinforcement of the double-exchange interaction, in turn, improves the ferromagnetism of LSMO.

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