Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface?

J. A. Krieger, Y. Ou, M. Caputo, A. Chikina, M. Döbeli, M.-A. Husanu, I. Keren, T. Prokscha, A. Suter, Cui-Zu Chang, J. S. Moodera, V. N. Strocov, and Z. Salman
Phys. Rev. B 99, 064423 – Published 19 February 2019

Abstract

We probe the local magnetic properties of interfaces between the insulating ferromagnet EuS and the topological insulator Bi2Se3 using low energy muon spin rotation (LEμSR). We compare these to the interface between EuS and the topologically trivial metal, titanium. Below the magnetic transition of EuS, we detect strong local magnetic fields which extend several nm into the adjacent layer and cause a complete depolarization of the muons. However, in both Bi2Se3 and titanium we measure similar local magnetic fields, implying that their origin is mostly independent of the topological properties of the interface electronic states. In addition, we use resonant soft x-ray angle resolved photoemission spectroscopy (SX-ARPES) to probe the electronic band structure at the interface between EuS and Bi2Se3. By tuning the photon energy to the Eu antiresonance at the Eu M5 pre-edge we are able to detect the Bi2Se3 conduction band, through a protective Al2O3 capping layer and the EuS layer. Moreover, we observe a signature of an interface-induced modification of the buried Bi2Se3 wave functions and/or the presence of interface states.

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  • Received 26 November 2018

DOI:https://doi.org/10.1103/PhysRevB.99.064423

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. A. Krieger1,2,3,*, Y. Ou4, M. Caputo2, A. Chikina2, M. Döbeli5, M.-A. Husanu2,6, I. Keren1, T. Prokscha1, A. Suter1, Cui-Zu Chang4,7, J. S. Moodera4,8, V. N. Strocov2,†, and Z. Salman1,‡

  • 1Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • 2Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • 3Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland
  • 4Francis Bitter Magnet Lab, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 5Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, CH-8093 Zürich, Switzerland
  • 6National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
  • 7Department of Physics, The Penn State University, State College, Pennsylvania 16802, USA
  • 8Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

  • *jonas.krieger@psi.ch
  • vladimir.strocov@psi.ch
  • zaher.salman@psi.ch

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Issue

Vol. 99, Iss. 6 — 1 February 2019

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