Ultra-high spin emission from antiferromagnetic FeRh

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, Caterina Ducati, Christopher H. Marrows, Joseph Barker () and Chiara Ciccarelli ()
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Dominik Hamara: University of Cambridge
Mara Strungaru: University of York
Jamie R. Massey: University of Leeds
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

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-48795-z

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