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The optical intersite spin transfer (OISTR) effect was recently verified inFe$_{50}$Ni$_{50}$ using magneto-optical Kerr measurements in the extremeultraviolet range. However, one of the main experimental signatures analyzed inthis work, namely a magnetic moment increase at a specific energy in Ni, wassubsequently found also in pure Ni, where no transfer from one element toanother is possible. Hence, it is a much-discussed issue whether OISTR in FeNialloys is real and whether it can be verified experimentally or not. Here, wepresent a comparative study of spin transfer in Fe$_{50}$Ni$_{50}$,Fe$_{19}$Ni$_{81}$ and pure Ni. We conclusively show that an increase in themagneto-optical signal is indeed insufficient to verify OISTR. However, we alsoshow how an extended data analysis overcomes this problem and allows tounambiguously identify spin transfer effects. Concomitantly, our work solvesthe long-standing riddle about the origin of delayed demagnetization behaviorof Ni in FeNi alloys.

Verification of ultrafast spin transfer effects in FeNi alloys