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(a) Normalised Co L-edge XMCD spectra and integrated XMCD spectra of as-deposited and 350 °C-annealed samples of tCo = 2.0 nm. (b) Co thickness dependence of morb/mspin* obtained in this study (Pt/Ru/Co/TiOx structure) and previous studies (Pt/Co/AlOx structure)30,31.