Co-doped LaLa1-xSrxTiO3-d : A Diluted Magnetic Oxide System with High Curie Temperature
Y. G. Zhao, S. R. Shinde, S. B. Ogale, J. Higgins, S. E. Lofland, C., Lanci, J. P. Buban, N. D. Browning, S. Das Sarma, A. J. Millis, V.N., Kulkarni, R. J. Choudhary, R. L. Greene, T. Venkatesan
TL;DR
This study reports room-temperature ferromagnetism in Co-doped LaLa1-xSrxTiO3-d thin films, demonstrating potential as a diluted magnetic oxide with tunable electronic properties based on growth conditions.
Contribution
It introduces a new Co-doped Ti-based oxide system exhibiting high-temperature ferromagnetism with tunable optical and electronic properties, highlighting its potential as a diluted magnetic semiconductor.
Findings
Ferromagnetism observed at and above room temperature.
Electronic properties range from metallic to semiconducting depending on oxygen pressure.
Inhomogeneity appears at higher cobalt concentrations.
Abstract
Ferromagnetism is observed at and above room temperature in pulsed laser deposited epitaxial films of Co-doped Ti-based oxide perovskite (La1-xSrxTiO3-d). The system has the characteristics of an intrinsic diluted magnetic semiconductor (metal) at low concentrations (<~ 2 %), but develops inhomogeneity at higher cobalt concentrations. The films range from being opaque metallic to transparent semiconducting depending on the oxygen pressure during growth and are yet ferromagnetic.
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