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Ultra-high spin emission from antiferromagnetic FeRh

Author

Listed:
  • Dominik Hamara

    (University of Cambridge)

  • Mara Strungaru

    (University of York)

  • Jamie R. Massey

    (University of Leeds
    ETH Zurich
    Paul Scherrer Institute)

  • Quentin Remy

    (Freie Universität Berlin)

  • Xin Chen

    (University of Cambridge)

  • Guillermo Nava Antonio

    (University of Cambridge)

  • Obed Alves Santos

    (University of Cambridge)

  • Michel Hehn

    (Université de Lorraine, CNRS, IJL)

  • Richard F. L. Evans

    (University of York)

  • Roy W. Chantrell

    (University of York)

  • Stéphane Mangin

    (Université de Lorraine)

  • Caterina Ducati

    (University of Cambridge)

  • Christopher H. Marrows

    (University of Leeds)

  • Joseph Barker

    (University of Leeds)

  • Chiara Ciccarelli

    (University of Cambridge)

Abstract

An antiferromagnet emits spin currents when time-reversal symmetry is broken. This is typically achieved by applying an external magnetic field below and above the spin-flop transition or by optical pumping. In this work we apply optical pump-THz emission spectroscopy to study picosecond spin pumping from metallic FeRh as a function of temperature. Intriguingly we find that in the low-temperature antiferromagnetic phase the laser pulse induces a large and coherent spin pumping, while not crossing into the ferromagnetic phase. With temperature and magnetic field dependent measurements combined with atomistic spin dynamics simulations we show that the antiferromagnetic spin-lattice is destabilised by the combined action of optical pumping and picosecond spin-biasing by the conduction electron population, which results in spin accumulation. We propose that the amplitude of the effect is inherent to the nature of FeRh, particularly the Rh atoms and their high spin susceptibility. We believe that the principles shown here could be used to produce more effective spin current emitters. Our results also corroborate the work of others showing that the magnetic phase transition begins on a very fast picosecond timescale, but this timescale is often hidden by measurements which are confounded by the slower domain dynamics.

Suggested Citation

  • Dominik Hamara & Mara Strungaru & Jamie R. Massey & Quentin Remy & Xin Chen & Guillermo Nava Antonio & Obed Alves Santos & Michel Hehn & Richard F. L. Evans & Roy W. Chantrell & Stéphane Mangin & Cate, 2024. "Ultra-high spin emission from antiferromagnetic FeRh," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48795-z
    DOI: 10.1038/s41467-024-48795-z
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    References listed on IDEAS

    as
    1. G. Li & R. Medapalli & J. H. Mentink & R. V. Mikhaylovskiy & T. G. H. Blank & S. K. K. Patel & A. K. Zvezdin & Th. Rasing & E. E. Fullerton & A. V. Kimel, 2022. "Ultrafast kinetics of the antiferromagnetic-ferromagnetic phase transition in FeRh," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
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