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 language||English (US)|
|Journal||Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics|
|State||Published - Jul 1 2014|