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

doi:10.1038/srep05727

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

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

56 Citations (Scopus)

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 language	English
Article number	5727
Journal	Scientific reports
Volume	4
DOIs	https://doi.org/10.1038/srep05727
Publication status	Published - 2014 Jul 17
Externally published	Yes

ASJC Scopus subject areas

General

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Access to Document

10.1038/srep05727

Cite this

@article{8a000266abe24eb2995d14f4c8de12df,

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

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.",

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

note = "Funding Information: A part of the work was supported by FIRST program initiated by the Council for Science and Technology Policy (CSTP) and by TIES, MEXT Elements Strategy Initiative to Form Core Research Center (S.M.). We wish to thank Ms. Reiko Kondou for her assistance in the fabrication of iPCMs.",

year = "2014",

month = jul,

day = "17",

doi = "10.1038/srep05727",

language = "English",

volume = "4",

journal = "Scientific Reports",

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TY - JOUR

T1 - Mirror-symmetric magneto-optical kerr rotation using visible light in [(GeTe)2(Sb2Te3)1[n topological superlattices

AU - Bang, Do

AU - Awano, Hiroyuki

AU - Tominaga, Junji

AU - Kolobov, Alexander V.

AU - Fons, Paul

AU - Saito, Yuta

AU - Makino, Kotaro

AU - Nakano, Takashi

AU - Hase, Muneaki

AU - Takagaki, Yukihiko

AU - Giussani, Alessandro

AU - Calarco, Raffaella

AU - Murakami, Shuichi

N1 - Funding Information: A part of the work was supported by FIRST program initiated by the Council for Science and Technology Policy (CSTP) and by TIES, MEXT Elements Strategy Initiative to Form Core Research Center (S.M.). We wish to thank Ms. Reiko Kondou for her assistance in the fabrication of iPCMs.

PY - 2014/7/17

Y1 - 2014/7/17

N2 - 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.

AB - 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.

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