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, Z. Salman

Research output: Contribution to journalArticle

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 (LE-μSR). 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.

Original languageEnglish (US)
Article number064423
JournalPhysical Review B
Volume99
Issue number6
DOIs
StatePublished - Feb 19 2019

Fingerprint

Ferromagnetism
Titanium
ferromagnetism
topology
Topology
Magnetic fields
Interface states
Depolarization
Electronic states
Photoelectron spectroscopy
Wave functions
Conduction bands
Band structure
Magnetic properties
Photons
Tuning
Metals
X rays
titanium
muon spin rotation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Krieger, J. A., Ou, Y., Caputo, M., Chikina, A., Döbeli, M., Husanu, M. A., ... Salman, Z. (2019). Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface? Physical Review B, 99(6), [064423]. https://doi.org/10.1103/PhysRevB.99.064423
Krieger, J. A. ; Ou, Y. ; Caputo, M. ; Chikina, A. ; Döbeli, M. ; Husanu, M. A. ; Keren, I. ; Prokscha, T. ; Suter, A. ; Chang, Cui Zu ; Moodera, J. S. ; Strocov, V. N. ; Salman, Z. / Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface?. In: Physical Review B. 2019 ; Vol. 99, No. 6.
@article{ebe48fe118a74095af98ef5dd4c658ab,
title = "Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface?",
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 (LE-μSR). 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.",
author = "Krieger, {J. A.} and Y. Ou and M. Caputo and A. Chikina and M. D{\"o}beli and Husanu, {M. A.} and I. Keren and T. Prokscha and A. Suter and Chang, {Cui Zu} and Moodera, {J. S.} and Strocov, {V. N.} and Z. Salman",
year = "2019",
month = "2",
day = "19",
doi = "10.1103/PhysRevB.99.064423",
language = "English (US)",
volume = "99",
journal = "Physical Review B-Condensed Matter",
issn = "2469-9950",
publisher = "American Physical Society",
number = "6",

}

Krieger, JA, Ou, Y, Caputo, M, Chikina, A, Döbeli, M, Husanu, MA, Keren, I, Prokscha, T, Suter, A, Chang, CZ, Moodera, JS, Strocov, VN & Salman, Z 2019, 'Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface?', Physical Review B, vol. 99, no. 6, 064423. https://doi.org/10.1103/PhysRevB.99.064423

Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface? / Krieger, J. A.; Ou, Y.; Caputo, M.; Chikina, A.; Döbeli, M.; Husanu, M. A.; Keren, I.; Prokscha, T.; Suter, A.; Chang, Cui Zu; Moodera, J. S.; Strocov, V. N.; Salman, Z.

In: Physical Review B, Vol. 99, No. 6, 064423, 19.02.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface?

AU - Krieger, J. A.

AU - Ou, Y.

AU - Caputo, M.

AU - Chikina, A.

AU - Döbeli, M.

AU - Husanu, M. A.

AU - Keren, I.

AU - Prokscha, T.

AU - Suter, A.

AU - Chang, Cui Zu

AU - Moodera, J. S.

AU - Strocov, V. N.

AU - Salman, Z.

PY - 2019/2/19

Y1 - 2019/2/19

N2 - We probe the local magnetic properties of interfaces between the insulating ferromagnet EuS and the topological insulator Bi2Se3 using low energy muon spin rotation (LE-μSR). 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.

AB - We probe the local magnetic properties of interfaces between the insulating ferromagnet EuS and the topological insulator Bi2Se3 using low energy muon spin rotation (LE-μSR). 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.

UR - http://www.scopus.com/inward/record.url?scp=85061987450&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85061987450&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.99.064423

DO - 10.1103/PhysRevB.99.064423

M3 - Article

AN - SCOPUS:85061987450

VL - 99

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 2469-9950

IS - 6

M1 - 064423

ER -

Krieger JA, Ou Y, Caputo M, Chikina A, Döbeli M, Husanu MA et al. Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface? Physical Review B. 2019 Feb 19;99(6). 064423. https://doi.org/10.1103/PhysRevB.99.064423