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Termination switching of antiferromagnetic proximity effect in topological insulator
- Source :
- Science advances, vol 6, iss 33, Science Advances
- Publication Year :
- 2020
- Publisher :
- eScholarship, University of California, 2020.
-
Abstract
- Atomic termination plays a key role in activating the proximity effect of antiferromagnet.<br />This work reports the ferromagnetism of topological insulator, (Bi,Sb)2Te3 (BST), with a Curie temperature of approximately 120 K induced by magnetic proximity effect (MPE) of an antiferromagnetic CrSe. The MPE was shown to be highly dependent on the stacking order of the heterostructure, as well as the interface symmetry: Growing CrSe on top of BST results in induced ferromagnetism, while growing BST on CrSe yielded no evidence of an MPE. Cr-termination in the former case leads to double-exchange interactions between Cr3+ surface states and Cr2+ bulk states. This Cr3+-Cr2+ exchange stabilizes the ferromagnetic order localized at the interface and magnetically polarizes the BST Sb band. In contrast, Se-termination at the CrSe/BST interface yields no detectable MPE. These results directly confirm the MPE in BST films and provide critical insights into the sensitivity of the surface state.
- Subjects :
- inorganic chemicals
Multidisciplinary
Materials science
Condensed matter physics
Materials Science
Stacking
SciAdv r-articles
Heterojunction
02 engineering and technology
Condensed Matter Physics
021001 nanoscience & nanotechnology
01 natural sciences
Ferromagnetism
Topological insulator
0103 physical sciences
Proximity effect (superconductivity)
Curie temperature
Antiferromagnetism
Condensed Matter::Strongly Correlated Electrons
Physics::Atomic Physics
010306 general physics
0210 nano-technology
Research Articles
Research Article
Surface states
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Science advances, vol 6, iss 33, Science Advances
- Accession number :
- edsair.doi.dedup.....c1a2c32a624868ddb60050c4cb694a2a