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Enhancing Magnetic Ordering in Cr-doped Bi2Se3 using High-TC Ferrimagnetic Insulator

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arxiv 1503.07893 v1 pith:RXSLTO5K submitted 2015-03-26 cond-mat.mtrl-sci

Wenqing Liu , Liang He , Yongbing Xu , Koichi Murata , Mehmet C. Onbasli , Murong Lang , Nick J. Maltby , Shunpu Li
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Xuefeng Wang Caroline A. Ross Peter Bencok Gerrit van der Laan Rong Zhang Kang. L. Wang
This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords insulatormagneticdopedenhancingferrimagnetichigh-tcinteractionmagnetically
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We report a study of enhancing the magnetic ordering in a model magnetically doped topological insulator (TI), Bi2-xCrxSe3, via the proximity effect using a high-TC ferrimagnetic insulator Y3Fe5O12. The FMI provides the TI with a source of exchange interaction yet without removing the nontrivial surface state. By performing the elemental specific X-ray magnetic circular dichroism (XMCD) measurements, we have unequivocally observed an enhanced TC of 50 K in this magnetically doped TI/FMI heterostructure. We have also found a larger (6.6 nm at 30 K) but faster decreasing (by 80% from 30 K to 50 K) penetration depth compared to that of diluted ferromagnetic semiconductors (DMSs), which could indicate a novel mechanism for the interaction between FMIs and the nontrivial TIs surface.

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