Enhancing magnetic ordering in Cr-doped Bi2Se3 using high- T C ferrimagnetic insulator

Wenqing Liu; 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

doi:10.1021/nl504480g

Enhancing magnetic ordering in Cr-doped Bi₂Se₃ using high- T _C ferrimagnetic insulator

Wenqing Liu, 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

College of Electrical Engineering and Computer Science

Research output: Contribution to journal › Article › peer-review

81 Citations (Scopus)

Abstract

We report a study of enhancing the magnetic ordering in a model magnetically doped topological insulator (TI), Bi_2-xCr_xSe₃, via the proximity effect using a high-T_C 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 T_C 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.

Original language	English
Pages (from-to)	764-769
Number of pages	6
Journal	Nano letters
Volume	15
Issue number	1
DOIs	https://doi.org/10.1021/nl504480g
Publication status	Published - 2015 Jan 14

All Science Journal Classification (ASJC) codes

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl504480g

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title = "Enhancing magnetic ordering in Cr-doped Bi2Se3 using high- T C ferrimagnetic insulator",

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.",

author = "Wenqing Liu and Liang He and Yongbing Xu and Koichi Murata and Onbasli, {Mehmet C.} and Murong Lang and Maltby, {Nick J.} and Shunpu Li and Xuefeng Wang and Ross, {Caroline A.} and Peter Bencok and {Van Der Laan}, Gerrit and Rong Zhang and Wang, {Kang L.}",

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doi = "10.1021/nl504480g",

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AU - Liu, Wenqing

AU - He, Liang

AU - Xu, Yongbing

AU - Murata, Koichi

AU - Onbasli, Mehmet C.

AU - Lang, Murong

AU - Maltby, Nick J.

AU - Li, Shunpu

AU - Wang, Xuefeng

AU - Ross, Caroline A.

AU - Bencok, Peter

AU - Van Der Laan, Gerrit

AU - Zhang, Rong

AU - Wang, Kang L.

PY - 2015/1/14

Y1 - 2015/1/14

N2 - 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.

AB - 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.

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Enhancing magnetic ordering in Cr-doped Bi₂Se₃ using high- T _C ferrimagnetic insulator

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