Element-resolved evidence of superdiffusive spin current arising from ultrafast demagnetization process

Gupta，R.1,2; Cosco，F.2; Malik，R. S.2; Chen，X.2,3; Saha，S.2,4; Ghosh，A.2,5; Pohlmann，T.6; Mardegan，J. R.L.6; Francoual，S.6; Stefanuik，R.2; Söderström，J.2; Sanyal，B.2; Karis，O.2; Svedlindh，P.1; Oppeneer，P. M.2; Knut，R.2

2023-08-01

10.1103/PhysRevB.108.064427

Physical Review B   Impact Factor & Quartile

2469-9950

2469-9969

Using element-specific measurements of the ultrafast demagnetization of Ru/Fe65Co35 hetero-structures, we show that Ru can exhibit a significant magnetic contrast (3% asymmetry) resulting from ultrafast spin currents emanating from the demagnetization process of the FeCo layer. We use this magnetic contrast to investigate how superdiffusive spin currents are affected by the doping of heavy elements in the FeCo layer. We find that the spin currents are strongly suppressed, and that the recovery process in Ru slows down by Re doping. This is in accordance with a change in interface reflectivity of spin currents as found by the superdiffusive spin transport model.

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PHYSICS

2-s2.0-85169289823

Scopus

1.Department of Materials Science and Engineering,Uppsala University,Uppsala,Box 35,SE-751 03,Sweden
2.Department of Physics and Astronomy,Uppsala University,Uppsala,Box 516,SE-751 20,Sweden
3.Department of Physics,Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
4.Department of Physics,Ashoka University,Haryana,131029,India
5.MAX IV Laboratory,Lund University,Lund,SE-22 100,Sweden
6.Deutsches Elektronen-Synchrotron (DESY),Hamburg,Notkestrasse 85,D-22607,Germany

Gupta，R.,Cosco，F.,Malik，R. S.,et al. Element-resolved evidence of superdiffusive spin current arising from ultrafast demagnetization process[J]. Physical Review B,2023,108(6).

Gupta，R..,Cosco，F..,Malik，R. S..,Chen，X..,Saha，S..,...&Knut，R..(2023).Element-resolved evidence of superdiffusive spin current arising from ultrafast demagnetization process.Physical Review B,108(6).

Gupta，R.,et al."Element-resolved evidence of superdiffusive spin current arising from ultrafast demagnetization process".Physical Review B 108.6(2023).