
There is a more recent version of this eprint available. Click here to view it.
Hamara, D., Strungaru, M., Massey, J. et al. (10 more authors) (2024) Ultra-high spin emission from antiferromagnetic FeRh. [Preprint - arXiv]
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.
Metadata
Item Type: | Preprint |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | This is an open access preprint under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Condensed Matter (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Jan 2025 10:37 |
Last Modified: | 21 Jan 2025 10:37 |
Identification Number: | 10.48550/arxiv.2404.07841 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:222003 |
Available Versions of this Item
- Ultra-high spin emission from antiferromagnetic FeRh. (deposited 21 Jan 2025 10:37) [Currently Displayed]