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Ultrafast magnetization dynamics in half-metallic Co2FeAl Heusler alloy

Ultrafast magnetization dynamics in half-metallic Co2FeAl Heusler alloy

Authors :
Malik, Rameez Saeed
Delczeg-Czirjak, Erna Krisztina
Knut, Ronny
Vaskivskyi, Igor
Stefanuik, Robert
Kvashnin, Yaroslav
Söderström, Johan
Karis, Olof
Thonig, Danny
Gupta, Rahul
Husain, Sajid
Kumar, Ankit
Svedlindh, Peter
Eriksson, Olle
Malik, Rameez Saeed
Delczeg-Czirjak, Erna Krisztina
Knut, Ronny
Vaskivskyi, Igor
Stefanuik, Robert
Kvashnin, Yaroslav
Söderström, Johan
Karis, Olof
Thonig, Danny
Gupta, Rahul
Husain, Sajid
Kumar, Ankit
Svedlindh, Peter
Eriksson, Olle

Abstract

We report on optically induced, ultrafast magnetization dynamics in the Heusler alloy Co2FeAl,probed by time-resolved magneto-optical Kerr effect. Experimental results are compared to resultsfrom electronic structure theory and atomistic spin-dynamics simulations. Experimentally, we findthat the demagnetization time (τM) in films of Co2FeAl is almost independent of varying structuralorder, and that it is similar to that in elemental 3d ferromagnets. In contrast, the slower processof magnetization recovery, specified byτR, is found to occur on picosecond time scales, and isdemonstrated to correlate strongly with the Gilbert damping parameter (α). Our results showthat Co2FeAl is unique, in that it is the first material that clearly demonstrates the importance ofthe damping parameter in the remagnetization process. Based on these results we argue that for Co2FeAl the remagnetization process is dominated by magnon dynamics, something which mighthave general applicabilit

Details

Database :
OAIster
Notes :
application/pdf, application/pdf, English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1235291565
Document Type :
Electronic Resource