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- Title
Persistent optically induced magnetism in oxygen-deficient strontium titanate.
- Authors
Rice, W. D.; Ambwani, P.; Bombeck, M.; Thompson, J. D.; Haugstad, G.; Leighton, C.; Crooker, S. A.
- Abstract
Strontium titanate (SrTiO3) is a foundational material in the emerging field of complex oxide electronics. Although its bulk electronic and optical properties are rich and have been studied for decades, SrTiO3 has recently become a renewed focus of materials research catalysed in part by the discovery of superconductivity and magnetism at interfaces between SrTiO3 and other non-magnetic oxides. Here we illustrate a new aspect to the phenomenology of magnetism in SrTiO3 by reporting the observation of an optically induced and persistent magnetization in slightly oxygen-deficient bulk SrTiO3-δ crystals using magnetic circular dichroism (MCD) spectroscopy and SQUID magnetometry. This zero-field magnetization appears below ~18 K, persists for hours below 10 K, and is tunable by means of the polarization and wavelength of sub-bandgap (400-500 nm) light. These effects occur only in crystals containing oxygen vacancies, revealing a detailed interplay between magnetism, lattice defects, and light in an archetypal complex oxide material.
- Subjects
STRONTIUM titanate; MAGNETISM; MAGNETIC circular dichroism; HETEROSTRUCTURES; MAGNETIZATION; MAGNETORESISTANCE; BAND gaps
- Publication
Nature Materials, 2014, Vol 13, Issue 5, p481
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/NMAT3914