Revealing optically induced magnetization in SrTiO3 using optically coupled SQUID magnetometry and magnetic circular dichroism

William D. Rice; Palak Ambwani; Joe D. Thompson; Christopher Leighton; Scott A. Crooker

doi:10.1116/1.4871691

Revealing optically induced magnetization in SrTiO₃ using optically coupled SQUID magnetometry and magnetic circular dichroism

William D. Rice, Palak Ambwani, Joe D. Thompson, Christopher Leighton, Scott A. Crooker

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

In this work, the authors study the time- and temperature-dependence of optically induced magnetization in bulk crystals of slightly oxygen-deficient SrTiO_3-δ using an optically coupled superconducting quantum interference device magnetometer. Circularly-polarized sub-bandgap light is found to induce a weak (∼5 × 10^-7 emu) but extremely long-lived (hours) magnetic moment in SrTiO_3-δ at zero magnetic field. The authors utilize this effect to demonstrate that SrTiO_3-δ crystals can be used as an optically addressable magnetic memory by writing and subsequently reading magnetic patterns with light. The induced magnetization is consistent with that of a polarized ensemble of independent oxygen-vacancy-related complexes, rather than from collective or long-range magnetic order.

Original language	English (US)
Article number	04E102
Journal	Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics
Volume	32
Issue number	4
DOIs	https://doi.org/10.1116/1.4871691
State	Published - Jul 1 2014

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© 2014 American Vacuum Society.

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Revealing optically induced magnetization in SrTiO₃ using optically coupled SQUID magnetometry and magnetic circular dichroism. / Rice, William D.; Ambwani, Palak; Thompson, Joe D. et al.
In: Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics, Vol. 32, No. 4, 04E102, 01.07.2014.

Research output: Contribution to journal › Article › peer-review

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