| Literature DB >> 25533900 |
Wenqing Liu1, Liang He, Yongbing Xu, Koichi Murata, Mehmet C Onbasli, Murong Lang, Nick J Maltby, Shunpu Li, Xuefeng Wang, Caroline A Ross, Peter Bencok, Gerrit van der Laan, Rong Zhang, Kang L Wang.
Abstract
We report a study of enhancing the magnetic ordering in a model magnetically doped topological insulator (TI), Bi(2-x)Cr(x)Se(3), via the proximity effect using a high-TC ferrimagnetic insulator Y(3)Fe(5)O(12). 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 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.Entities:
Keywords: Magnetic topological insulator; XMCD; ferrimagnetic insulator YIG; proximity effect; spintronics
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Year: 2014 PMID： 25533900 DOI： 10.1021/nl504480g
Source DB: PubMed Journal: Nano Lett ISSN： 1530-6984 Impact factor: 11.189