Ferromagnetism on a paramagnetic host background in cobalt-doped Bi2Se3 topological insulator

doi:10.1088/1674-1056/23/7/076104

Abstract Cobalt-doped Bi₂Se₃ topological insulators have been grown though melt-grown reaction. The Bi₂Se₃ matrix is diamagnetic and doped sample is a superposition of ferromagnetism (FM) and paramagnetism (PM) behavior at low temperature. The values of M_Smol, H_c, and M_r increase as the Co concentration increases. Two possible explanations have been proposed for the origin of ferromagnetism in Co-doped Bi₂Se₃. One is the magnetic ordering from nanoclusters of Co-Se compound in the crystals, and the other is Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between magnetic impurities.

Keywords: topological insulator (TI) ferromagnetism Bi₂Se₃

Received: 10 November 2013
Revised: 22 January 2014
Accepted manuscript online:

PACS:	61.72.U-	(Doping and impurity implantation)
	75.50.Gg	(Ferrimagnetics)
	75.50.Pp	(Magnetic semiconductors)

Fund: Project supported by the Program of International S&T Cooperation (Grant No. 2013DFA51050), the National Magnetic Confinement Fusion Science Program of China (Grant No. 2011GB112001), the Science Foundation of Sichuan Province, China (Grant Nos. 2011JY0031 and 2011JY0130), the National Natural Science Foundation of China (Grant Nos. 51271155 and 51002125), and the Fundamental Research Funds for the Central Universities of China (Grant Nos. SWJTU2682013CX005 and SWJTU12CX018).

Corresponding Authors: Yang Xin-Sheng
E-mail: xsyang@swjtu.edu.cn

About author: 61.72.U-; 75.50.Gg; 75.50.Pp

Cite this article:

Zhang Min (张敏), Lü Li (吕莉), Wei Zhan-Tao (魏占涛), Yang Xin-Sheng (羊新胜), Zhao Yong (赵勇) Ferromagnetism on a paramagnetic host background in cobalt-doped Bi₂Se₃ topological insulator 2014 Chin. Phys. B 23 076104

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Ferromagnetism on a paramagnetic host background in cobalt-doped Bi2Se3 topological insulator

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Ferromagnetism on a paramagnetic host background in cobalt-doped Bi₂Se₃ topological insulator