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Large Fieldlike Spin-Orbit Torque and Magnetization Manipulation in a Fully Epitaxial van der Waals Two-Dimensional-Ferromagnet/Topological-Insulator Heterostructure Grown by Molecular-Beam Epitaxy

N. Figueiredo-Prestes1,*, P. Tsipas2, S. Krishnia1, P. Pappas2, J. Peiro1, S. Fragkos2,‡, V. Zatko1, A. Lintzeris2,§, B. Dlubak1 et al.

S. Chaitoglou2, M. Heuken3, N. Reyren1, H. Jaffrès1, P. Seneor1, A. Dimoulas2, and J.-M. George1,†

  • 1Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
  • 2National Center for Scientific Research DEMOKRITOS, Institute of Nanoscience and Nanotechnology, 15341 Athens, Greece
  • 3AIXTRON SE, Herzogenrath, Germany

  • *nicholas.figueiredo@cnrs-thales.fr
  • †jeanmarie.george@cnrs-thales.fr
  • ‡Also at Department of Mechanical Engineering, University of West Attica, 12241 Athens, Greece.
  • §Also at Department of Physics, National Technical University of Athens, 15780 Athens, Greece.
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Phys. Rev. Applied 19, 014012 – Published 5 January, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.014012

Abstract

With the development of technologies taking advantage of emerging quantum phenomena under extreme conditions of dimensionality and temperature, the search for alternative materials and heterostructure engineering has opened up on several fronts. Here, we report the magnetotransport properties of topological-insulator/two-dimensional-ferromagnet (TI/2D-FM) heterostructures composed of Cr1+δTe2/Bi2Te3 stacks grown by molecular-beam epitaxy. The electrical transport measurements reveal high levels of fieldlike effective torques, up to 115 mT at a current density of 107A/cm2; the occurrence of interfacial magnetoresistance effects, such as the anisotropic interfacial magnetoresistance; and anomalies in the anomalous Hall effect. Furthermore, we report on complementary characterization with scanning tunneling microscopy, angle-resolved photoemission spectroscopy, and superconducting quantum interference device measurements. Finally, magnetization reversal induced by current pulses is also reported. The reported results make the relevance of the TI/2D-FM interface evident and indicate the preservation of polarized surface states at the interface.

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Phys. Rev. Applied 19, 014012– Published 5 January, 2023
  • Received 27 June 2022
  • Revised 25 August 2022
  • Accepted 29 September 2022
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