Absence of magnetic-proximity effect at the interface of Bi$_2$Se$_3$ and (Bi,Sb)$_2$Te$_3$ with EuS

A. I. Figueroa; A. Mugarza; F. Bonell; G. van der Laan; M. G. Cuxart; M. Valvidares; P. Gargiani; S. O. Valenzuela

arxiv: 2011.13323 · v1 · pith:DS2JCVDYnew · submitted 2020-11-26 · ❄️ cond-mat.mes-hall

Absence of magnetic-proximity effect at the interface of Bi₂Se₃ and (Bi,Sb)₂Te₃ with EuS

A. I. Figueroa , F. Bonell , M. G. Cuxart , M. Valvidares , P. Gargiani , G. van der Laan , A. Mugarza , S. O. Valenzuela This is my paper

classification ❄️ cond-mat.mes-hall

keywords magneticinterfacemeasurementsxmcdinducedabsenceallowanalysis

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We performed x-ray magnetic circular dichroism (XMCD) measurements on heterostructures comprising topological insulators (TIs) of the (Bi,Sb)$_2$(Se,Te)$_3$ family and the magnetic insulator EuS. XMCD measurements allow us to investigate element-selective magnetic proximity effects at the very TI/EuS interface. A systematic analysis reveals that there is neither significant induced magnetism within the TI nor an enhancement of the Eu magnetic moment at such interface. The induced magnetic moments in Bi, Sb, Te, and Se sites are lower than the estimated detection limit of the XMCD measurements of $\sim\!10^{-3}$ $\mu_\mathrm{B}$/at.

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Absence of magnetic-proximity effect at the interface of Bi₂Se₃ and (Bi,Sb)₂Te₃ with EuS

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