Enhanced ferromagnetism in monolayer Cr2Te3 via topological insulator coupling

被引：0

作者：

Ou, Yunbo ^{[1
]}

Mirzhalilov, Murod ^{[2
]}

Nemes, Norbert M. ^{[3
]}

Martinez, Jose L. ^{[4
]}

Rocci, Mirko ^{[1
]}

Duong, Alexander ^{[5
]}

Akey, Austin ^{[6
]}

Foucher, Alexandre C. ^{[7
]}

Ge, Wenbo ^{[8
]}

Suri, Dhavala ^{[9
]}

Wang, Yiping ^{[10
]}

Ambaye, Haile ^{[11
]}

Keum, Jong ^{[11
,12
]}

Randeria, Mohit ^{[2
]}

Trivedi, Nandini ^{[2
]}

Burch, Kenneth S. ^{[10
]}

Bell, David C. ^{[6
,13
]}

Ross, Frances M. ^{[7
]}

Wu, Weida ^{[8
]}

Heiman, Don ^{[1
,14
]}

Lauter, Valeria ^{[11
]}

Moodera, Jagadeesh S. ^{[1
,15
]}

Chi, Hang ^{[5
,16
,17
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Francis Bitter Magnet Lab, Cambridge, MA 02139 USA

[2] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[3] Univ Complutense Madrid, Fac Ciencias Fis, Dept Fis Mat, GFMC, Madrid 28040, Spain

[4] CSIC, Inst Ciencia Mat Madrid, ICMM, Calle Sor Juana Ines Cruz 3, Madrid 28049, Spain

[5] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada

[6] Harvard Univ, Ctr Nanoscale Syst, Cambridge, MA 02138 USA

[7] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[8] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ USA

[9] Indian Inst Sci, Ctr Nano Sci & Engn, Bengaluru 560012, Karnataka, India

[10] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[11] Oak Ridge Natl Lab, Neutron Scattering Div, Neutron Sci Directorate, Oak Ridge, TN 37831 USA

[12] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Phys Sci Directorate, Oak Ridge, TN 37831 USA

[13] Harvard Univ, Harvard John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[14] Northeastern Univ, Dept Phys, Boston, MA 02115 USA

[15] MIT, Dept Phys, Cambridge, MA 02139 USA

[16] Univ Ottawa, Sch Elect Engn & Comp Sci, Ottawa, ON K1N 6N5, Canada

[17] Univ Ottawa, Nexus Quantum Technol, Ottawa, ON K1N 6N5, Canada

来源：

REPORTS ON PROGRESS IN PHYSICS | 2025年 / 88卷 / 06期

基金：

加拿大自然科学与工程研究理事会; 欧盟地平线“2020”; 美国国家科学基金会;

关键词：

transition metal chalcogenides; molecular beam epitaxy; topological materials; two-dimensional magnetism; exchange coupling; TEMPERATURE; MAGNETISM; EXCHANGE; STATES;

D O I：

10.1088/1361-6633/add9c5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Exchange-coupled interfaces are pivotal in exploiting two-dimensional (2D) ferromagnetism. Due to the extraordinary correlations among charge, spin, orbital and lattice degrees of freedom, layered magnetic transition metal chalcogenides (TMCs) bode well for exotic topological phenomena. Here we report the realization of wafer-scale Cr2Te3 down to monolayer (ML) on insulating SrTiO3(111) and/or Al2O3(001) substrates using molecular beam epitaxy. Robust ferromagnetism persists in the 2D limit. In particular, the Curie temperature TC of 2 ML Cr2Te3 increases from 100 K to similar to 120 K when proximitized to topological insulator (TI) (Bi,Sb)2Te3, with substantially boosted magnetization as observed via polarized neutron reflectometry. Our experiments and theory strongly indicate that the Bloembergen-Rowland interaction is likely universal underlying TC enhancement in TI-coupled magnetic heterostructures. The topological-surface-enhanced magnetism in 2D TMC enables further exchange coupling physics and quantum hybrid studies, including paving the way to realize interface-modulated topological electronics.

引用

页数：9

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