Mirror-symmetric magneto-optical kerr rotation using visible light in [(GeTe)2(Sb2Te3)1[n topological superlattices

Do Bang, Hiroyuki Awano, Junji Tominaga, Alexander V. Kolobov, Paul Fons, Yuta Saito, Kotaro Makino, Takashi Nakano, Muneaki Hase, Yukihiko Takagaki, Alessandro Giussani, Raffaella Calarco, Shuichi Murakami

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Abstract

Interfacial phase change memory (iPCM), that has a structure of a superlattice made of alternating atomically thin GeTe and Sb2Te3 layers, has recently attracted attention not only due to its superior performance compared to the alloy of the same average composition in terms of energy consumption but also due to its strong response to an external magnetic field (giant magnetoresistance) that has been speculated to arise from switching between topological insulator (RESET) and normal insulator (SET) phases. Here we report magneto-optical Kerr rotation loops in the visible range, that have mirror symmetric resonances with respect to the magnetic field polarity at temperatures above 380 K when the material is in the SET phase that has Kramers-pairs in spin-split bands. We further found that this threshold temperature may be controlled if the sample was cooled in a magnetic field. The observed results open new possibilities for use of iPCM beyond phase-change memory applications.

Original languageEnglish
Article number5727
JournalScientific reports
Volume4
DOIs
Publication statusPublished - 2014 Jul 17
Externally publishedYes

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    Bang, D., Awano, H., Tominaga, J., Kolobov, A. V., Fons, P., Saito, Y., Makino, K., Nakano, T., Hase, M., Takagaki, Y., Giussani, A., Calarco, R., & Murakami, S. (2014). Mirror-symmetric magneto-optical kerr rotation using visible light in [(GeTe)2(Sb2Te3)1[n topological superlattices. Scientific reports, 4, [5727]. https://doi.org/10.1038/srep05727