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 MSmol, Hc, and Mr 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.
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