- Physical Review Journals
All JournalsPhysics Magazine

Physical Review B

Export citation

Export citation

Choose format for download:

Download Citation
  • Letter

Itinerant ferromagnetism mediated by giant spin polarization of the metallic ligand band in the van der Waals magnet Fe5GeTe2

K. Yamagami1,2, Y. Fujisawa1, B. Driesen1, C. H. Hsu1,3, K. Kawaguchi2, H. Tanaka2, T. Kondo2, Y. Zhang4, H. Wadati5,6 et al.

K. Araki7, T. Takeda7, Y. Takeda8, T. Muro9, F. C. Chuang3,10,11, Y. Niimi12,13, K. Kuroda2, M. Kobayashi6,14, and Y. Okada1

  • 1Okinawa Institute of Science and Technology Graduate University, Onna-son, Kunigami-gun, Okinawa 904-0495, Japan
  • 2Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277–8581, Japan
  • 3Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
  • 4Institute of High Energy Physics, Chinese Academy of Sciences, Shijingshan District, Beijing 100049, China
  • 5Graduate School of Material Science, University of Hyogo, Ako, Hyogo 678–1297, Japan
  • 6Institute of Laser Engineering, Osaka University, Suita, Osaka 565–0871, Japan
  • 7Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113–8656, Japan
  • 8Materials Sciences Research Center, Japan Atomic Energy Agency, Sayo-cho, Sayo-gun, Hyogo 679–5148, Japan
  • 9Japan Synchrotron Radiation Research Institute (JASRI), Sayo-cho, Sayo-gun, Hyogo 679–5198, Japan
  • 10Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
  • 11Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan
  • 12Department of Physics, Graduate School of Science, Osaka University, Toyonaka 560–0043, Japan
  • 13Center for Spintronics Research Network, Osaka University, Toyonaka 560–8531, Japan
  • 14Center for Spintronics Research Network, The University of Tokyo, Bunkyo-ku, Tokyo 113–8656, Japan

PDF

Phys. Rev. B 103, L060403 – Published 12 February, 2021

DOI: https://doi.org/10.1103/PhysRevB.103.L060403

Abstract

We investigate near-Fermi-energy (EF) element-specific electronic and spin states of ferromagnetic van der Waals (vdW) metal Fe5GeTe2. The soft x-ray angle-resolved photoemission spectroscopy (SX-ARPES) measurement provides spectroscopic evidence of localized Fe 3d band. We also find prominent hybridization between the localized Fe 3d band and the delocalized Ge/Te p bands. This picture is strongly supported from direct observation of the remarkable spin polarization of the ligand p bands near EF, using x-ray magnetic circular dichroism (XMCD) measurements. The strength of XMCD signal from ligand element Te shows the highest value, as far as we recognize, among literature reporting finite XMCD signal for nonmagnetic element in any systems. Combining SX-ARPES and elemental selective XMCD measurements, we collectively point to an important role of giant spin polarization of the delocalized ligand Te states for realizing itinerant long-range ferromagnetism in Fe5GeTe2. Our finding provides a fundamental elemental selective viewpoint for understanding mechanism of itinerant ferromagnetism in low-dimensional compounds, which also leads to insight for designing exotic magnetic states by interfacial band engineering in heterostructures.

View figure in article

Physics Subject Headings (PhySH)

Authorization Required

We need you to provide your credentials before accessing this content.

Other Options

Supplemental Material (Subscription Required)

References (Subscription Required)

Outline

Information

Phys. Rev. B 103, L060403– Published 12 February, 2021
  • Received 24 July 2020
  • Revised 23 October 2020
  • Accepted 7 January 2021
Crossmark - Check for updates button

©2021 American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation