Proximity-Driven Enhanced Magnetic Order at Ferromagnetic-Insulator-Magnetic-Topological-Insulator Interface

Mingda Li; Cui-Zu Chang; Brian J Kirby; Michelle E Jamer; Wenping Cui; Lijun Wu; Peng Wei; Yimei Zhu; Don Heiman; Ju Li; Jagadeesh S Moodera

doi:10.1103/PhysRevLett.115.087201

Proximity-Driven Enhanced Magnetic Order at Ferromagnetic-Insulator-Magnetic-Topological-Insulator Interface

Phys Rev Lett. 2015 Aug 21;115(8):087201. doi: 10.1103/PhysRevLett.115.087201. Epub 2015 Aug 17.

Authors

Mingda Li^{1

2

3}, Cui-Zu Chang², Brian J Kirby⁴, Michelle E Jamer⁵, Wenping Cui⁶, Lijun Wu³, Peng Wei², Yimei Zhu³, Don Heiman⁵, Ju Li^{1

7}, Jagadeesh S Moodera^{2

8}

Affiliations

¹ Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
² Fracsis Bitter Magnet Lab, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
³ Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
⁴ Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
⁵ Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA.
⁶ Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
⁷ Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
⁸ Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

PMID: 26340203
DOI: 10.1103/PhysRevLett.115.087201

Abstract

Magnetic exchange driven proximity effect at a magnetic-insulator-topological-insulator (MI-TI) interface provides a rich playground for novel phenomena as well as a way to realize low energy dissipation quantum devices. Here we report a dramatic enhancement of proximity exchange coupling in the MI/magnetic-TI EuS/Sb(2-x)V(x)Te3 hybrid heterostructure, where V doping is used to drive the TI (Sb2Te3) magnetic. We observe an artificial antiferromagneticlike structure near the MI-TI interface, which may account for the enhanced proximity coupling. The interplay between the proximity effect and doping in a hybrid heterostructure provides insights into the engineering of magnetic ordering.