The magnetic properties of the ultrathin FeCoCu (100) films grown at 110 K with Co underlayer thickness below 2 monolayers (ML) are investigated by means of the in situ magneto-optical Kerr effect. The spin reorientation transitions (SRT) from out-of-plane to in-plane influenced by the Co underlayer are observed. A simplified bilayer growth mode of Co is introduced to fit the experiment results, obtaining that the true critical Fe thickness of a SRT if without structural transformation for a fct Fe on Cu(001) is about 4.6 ML, the same value as the previous Co capping experiment.
Bibliographical noteFunding Information:
This work has been supported by the National Nature Science Foundation (Grant Nos. 10025417, 10374019, 60490290), grants from the Science and Technology Committee of Shanghai (Grant No. 04D214001) and the State Education Ministry in China
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