Inducing magnetism onto the surface of a topological crystalline insulator

B. A. Assaf, F. Katmis, P. Wei, Cui-Zu Chang, B. Satpati, J. S. Moodera, D. Heiman

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Inducing magnetism onto a topological crystalline insulator (TCI) has been predicted to result in several novel quantum electromagnetic effects. This is a consequence of the highly strain-sensitive band topology of such symmetry-protected systems. We thus show that placing the TCI surface of SnTe in proximity to EuS - a ferromagnetic insulator - induces magnetism at the interface between SnTe and EuS, and thus breaks time-reversal symmetry in the TCI. Magnetotransport experiments on SnTe-EuS-SnTe trilayer devices reveal a hysteretic lowering of the resistance at the TCI surface that coincides with an increase in the density of magnetic domain walls. This additional conduction could be a signature of topologically protected states within domain walls. Additionally, a hysteretic anomalous Hall effect reveals that the usual in-plane magnetic moment of the EuS layer is canted towards a perpendicular direction at the interface. These results are evidence of induced magnetism at the SnTe-EuS interfaces, resulting in broken time-reversal symmetry in the TCI.

Original languageEnglish (US)
Article number195310
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number19
DOIs
StatePublished - May 11 2015

Fingerprint

Magnetism
insulators
Crystalline materials
Domain walls
Crystal symmetry
domain wall
symmetry
Magnetoelectric effects
Galvanomagnetic effects
Magnetic domains
Hall effect
Magnetic moments
magnetic domains
Topology
proximity
topology
magnetic moments
signatures
electromagnetism
conduction

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Assaf, B. A. ; Katmis, F. ; Wei, P. ; Chang, Cui-Zu ; Satpati, B. ; Moodera, J. S. ; Heiman, D. / Inducing magnetism onto the surface of a topological crystalline insulator. In: Physical Review B - Condensed Matter and Materials Physics. 2015 ; Vol. 91, No. 19.
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Inducing magnetism onto the surface of a topological crystalline insulator. / Assaf, B. A.; Katmis, F.; Wei, P.; Chang, Cui-Zu; Satpati, B.; Moodera, J. S.; Heiman, D.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 91, No. 19, 195310, 11.05.2015.

Research output: Contribution to journalArticle

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