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I10-Beamline for Advanced Dichroism	Enhancing magnetic ordering in Cr-doped Bi2Se3 using high-Tc ferrimagnetic insulator Wenqing Liu , Liang He , Yongbing Xu , Koichi Murata , Mehmet C. Onbasli , Murong Lang , Nick Maltby , Shunpu Li , Xuefeng Wang , Caroline A. Ross , Peter Bencok , Gerrit Van Der Laan , Rong Zhang , Kang. L. Wang Nano Letters 15 (1), 764 - 769 DOI: 10.1021/nl504480g Diamond Proposal Number(s): [9953] Show Abstract ▼ Abstract: 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 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. KEYWORDS: Magnetic topological insulator, XMCD, proximity effect, ferrimagnetic insulator YIG, spintronics	Jan 2015

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