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- Title
Ultra-high spin emission from antiferromagnetic FeRh.
- Authors
Hamara, Dominik; Strungaru, Mara; Massey, Jamie R.; Remy, Quentin; Chen, Xin; Nava Antonio, Guillermo; Alves Santos, Obed; Hehn, Michel; Evans, Richard F. L.; Chantrell, Roy W.; Mangin, Stéphane; Ducati, Caterina; Marrows, Christopher H.; Barker, Joseph; Ciccarelli, Chiara
- 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. The authors measure picosecond spin pumping in FeRh as a function of temperature by optical pump-THz emission spectroscopy. In the antiferromagnetic phase of FeRh enhanced spin pumping above the value measured in the ferromagnetic phase is observed.
- Subjects
OPTICAL pumping; CONDUCTION electrons; MAGNETIC transitions; MAGNETIC field measurements; TERAHERTZ spectroscopy; EMISSION spectroscopy; LASER pulses; MAGNETIC fields
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-48795-z