Journal
NANO LETTERS
Volume 21, Issue 13, Pages 5874-5880Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01874
Keywords
magnetic topological insulator; hydrostatic pressure; quasi-two-dimensional ferromagnetic state; first-principles calculations; intralayer exchange coupling
Categories
Funding
- Key-Area Research and Development Program of Guangdong Province [2019B010931001]
- National Natural Science Foundation of China [11674150, 11804402, U2032218, 11974326, 11804144, 11974157, 11804342, 12074161]
- National Key R&D Program of China [2019YFA0704900]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06D348, 2017ZT07C062]
- Guangdong Provincial Key Laboratory of Computational Science and Material Design [2019B030301001]
- Science, Technology, and Innovation Commission of Shenzhen Municipality [JCYJ20160613160524999, ZDSYS20190902092905285, G02206304, G02206404]
- Shenzhen Key Laboratory [ZDSYS20170303165926217]
- College of Science of SUSTech [PHYS-HL-2020-1]
- Hefei Science Center of Chinese Academy of Sciences [2018ZYFX002]
- Center for Computational Science and Engineering at SUSTech
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The magnetic properties of MnBi2Te4(Bi2Te3)(n) can be manipulated by tuning the number of Bi2Te3 spacer layers n, with opposite responses observed for n = 1 and 2 under hydrostatic pressure. This is due to the essential role of intralayer exchange coupling from lattice compression in determining the magnetic properties, leading to a phase transition from A-type antiferromagnetic to quasi-two-dimensional ferromagnetic state. Such magnetic phase transition is also observed in 20% Sb-doped MnBi6Te10 due to in-plane lattice compression.
The magnetic structures of MnBi2Te4(Bi2Te3)(n) can be manipulated by tuning the interlayer coupling via the number of Bi2Te3 spacer layers n, while the intralayer ferromagnetic (FM) exchange coupling is considered too robust to control. By applying hydrostatic pressure up to 3.5 GPa, we discover opposite responses of magnetic properties for n = 1 and 2. MnBi4Te7 stays at A-type antiferromagnetic (AFM) phase with a decreasing Neel temperature and an increasing saturation field. In sharp contrast, MnBi6Te10 experiences a phase transition from A-type AFM to a quasi-two-dimensional FM state with a suppressed saturation field under pressure. First-principles calculations reveal the essential role of intralayer exchange coupling from lattice compression in determining these magnetic properties. Such magnetic phase transition is also observed in 20% Sb-doped MnBi6Te10 because of the in-plane lattice compression.
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