Sub-picosecond exchange-relaxation in the compensated ferrimagnet Mn2RuxGa
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2021Access:
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Guido Bonfiglio; Karsten Rode; Gwenael Atcheson; Plamen Stamenov; J. M. D. Coey; Alexey Kimel; Theo Rasing; Andrei Kirilyuk, Sub-picosecond exchange-relaxation in the compensated ferrimagnet Mn2RuxGa, Journal of Physics Condensed Matter, 33, 2021, 135804-1 - 135804-7Download Item:
Abstract:
We study the demagnetization dynamics of the fully compensated half-metallic ferrimagnet Mn2RuxGa. While the two antiferromagnetically coupled sublattices are both composed of manganese, they exhibit different temperature dependencies due to their differing local environments. The sublattice magnetization dynamics triggered by femtosecond laser pulses are studied to reveal the roles played by the spin and intersublattice exchange. We find a two-step demagnetization process, similar to the well-established case of Gd(FeCo)3, where on a 5 ps timescale the two Mn-sublattices seem to have different demagnetization rates. The behaviour is analysed using a four-temperature model, assigning different temperatures to the two manganese spin baths. Even in this strongly exchange-coupled system, the two spin reservoirs have considerably different behaviour. The half-metallic nature and strong exchange coupling of Mn2RuxGa lead to spin angular momentum conservation at much shorter time scales than found for Gd(FeCo)3 which suggests that low-power, sub-picosecond switching of the net moment of Mn2RuxGa is possible.
Sponsor
Grant Number
European Union (EU)
737038 TRANSPIRE
Science Foundation Ireland (SFI for RF)
12/RC/2278 AMBER
Science Foundation Ireland (SFI for RF)
16/IA/4534 ZEMS
Author's Homepage:
http://people.tcd.ie/venkatemhttp://people.tcd.ie/stamenp
http://people.tcd.ie/atchesog
http://people.tcd.ie/rodek
http://people.tcd.ie/jcoey
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PUBLISHEDSponsor:
European Union (EU)Science Foundation Ireland (SFI for RF)
Science Foundation Ireland (SFI for RF)
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Journal of Physics Condensed Matter33
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Full text availableKeywords:
Demagnetization, Ferrimagnetism, Magnetization dynamicsSubject (TCD):
Nanoscience & Materials , FABRICATION , NANOSTRUCTURES , Nanotechnology , PhysicsISSN:
0953-8984Metadata
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