Revealing Optically Induced Magnetization in SrTiO$_3$ using Optically Coupled SQUID Magnetometry and Magnetic Circular Dichroism
| Autor: | Rice, W. D., Ambwani, P., Thompson, J. D., Leighton, C., Crooker, S. A. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | J. of Vacuum Science and Technology B 32, 04E102 (2014) (PCSI-41 conference proceeding) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1116/1.4871691 |
| Popis: | In this work, we study the time- and temperature-dependence of optically induced magnetization in bulk crystals of slightly oxygen-deficient SrTiO$_{3-\delta}$ using an optically coupled SQUID magnetometer. We find that a weak ($\sim$5$\times$10$^{-7}$~emu) but extremely long-lived (hours) magnetic moment can be induced in SrTiO$_{3-\delta}$ at zero magnetic field by circular-polarized sub-bandgap light. We utilize this effect to demonstrate that SrTiO$_{3-\delta}$ 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. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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