The Magnetic Susceptibility Bifurcation in the Ni-Doped Sb2Te3 Topological Insulator with Antiferromagnetic Order Accompanied by Weak Ferromagnetic Alignment

Shiu-Ming Huang; Pin-Cing Wang; Hao-Lun Jian; Mitch M C Chou

doi:10.1186/s11671-021-03637-5

The Magnetic Susceptibility Bifurcation in the Ni-Doped Sb₂Te₃ Topological Insulator with Antiferromagnetic Order Accompanied by Weak Ferromagnetic Alignment

Nanoscale Res Lett. 2021 Dec 20;16(1):180. doi: 10.1186/s11671-021-03637-5.

Authors

Shiu-Ming Huang^{1

2}, Pin-Cing Wang³, Hao-Lun Jian⁴, Mitch M C Chou^{5

4

6}

Affiliations

¹ Department of Physics, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan. smhuang@mail.nsysu.edu.tw.
² Center of Crystal Research, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan. smhuang@mail.nsysu.edu.tw.
³ Department of Physics, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan.
⁴ Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan.
⁵ Center of Crystal Research, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan.
⁶ Taiwan Consortium of Emergent Crystalline Materials, TCECM, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan.

Abstract

The magnetic susceptibility reveals a discontinuity at Néel temperature and a hysteresis loop with low coercive field was observed below Néel temperature. The magnetic susceptibility of zero field cool and field cool processes coincide at a temperature above the discontinuity, and they split at temperature blow the discontinuity. The magnetic susceptibility splitting is larger at lower external magnetic fields. No more magnetic susceptibility splitting was observed at a magnetic field above 7000 Oe which is consistent with the magnetic anisotropy energy. Our study supports that these magnetic susceptibility characteristics originate from an antiferromagnetic order accompanied by weak ferromagnetism.

Keywords: Antiferromagnetism; Curie–Weiss law; Ferromagnetism topological material; Magnetic susceptibility.