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

Research output: Contribution to journalArticlepeer-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 SrTiO3-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 SrTiO3-δ at zero magnetic field. The authors utilize this effect to demonstrate that SrTiO3-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 languageEnglish (US)
Article number04E102
JournalJournal of Vacuum Science and Technology B: Nanotechnology and Microelectronics
Volume32
Issue number4
DOIs
StatePublished - Jul 1 2014

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