Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

Investigation of the magnetic thin film structures with perpendicular magnetic anisotropy (PMA) is interesting task for both fundamental research and possible applications. New effect of Ga+ ion irradiation induced changes of magnetic and magnetooptical properties was reported in [1] where two branches of PMA were discovered on the 2D maps (dCo, F) of magnetic and magnetooptical parameters driven by ion fluence F and Co thickness. We shall report results of studies performed on Pt/(Co(dCo= 3.3nm)/Pt samples: nonirradiated and two irradiated with fluences corresponding to first (F1= 2.8*1014 ions/cm2) and second (F2= 6*1015 ions/cm2) PMA branches on Co K-edge and Pt L2,3-edges using XANES and XMCD techniques. XANES studies for both irradiated samples showed: (i) changes of the spectra profiles and (ii) big changes of the amplitude for the fluence F2 what is related with induced by irradiation modification of the local environment of Co(Pt) atoms and etching process, respectively. XMCD Co spectra on irradiated samples had similar shape as once for CoPt alloy. XMCD Pt L2,3-edges studies reveal increase of the magnetic moments of Pt atoms for both irradiated samples.
[1] A. Maziewski et al., Phys. Rev. B 85, 054427 (2012).