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

Mirror-symmetric magneto-optical Kerr rotation using visible light in [(GeTe)2(Sb2Te3)1]n topological superlattices.
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DOI:
10.1038/srep05727
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发表时间:
2014-07-17
期刊:
影响因子:
4.6
通讯作者:
Murakami S
Murakami S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bang D;Awano H;Tominaga J;Kolobov AV;Fons P;Saito Y;Makino K;Nakano T;Hase M;Takagaki Y;Giussani A;Calarco R;Murakami S

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界面相变存储器(iPCM),其具有由交替的原子级薄GeTe和Sb 2 Te 3层制成的超晶格结构,最近,不仅由于其在能量消耗方面与相同平均组成的合金相比具有上级性能,而且由于其对外部磁场的强响应,这种磁致电阻(巨磁阻)已经被推测是由拓扑绝缘体(topological insulator,简称SOI)相和正常绝缘体(normal insulator,简称SET)相之间的切换引起的。在这里,我们报告的磁光克尔旋转回路在可见光范围内,具有镜像对称的共振相对于磁场极性在温度高于380 K时,材料是在SET阶段,有克拉默斯对自旋分裂带。 我们进一步发现,如果样品在磁场中冷却,则可以控制该阈值温度。观察到的结果打开了新的可能性,使用iPCM超越相变存储器应用。
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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