In situ high temperature X-ray reflectivity and grazing incidence X-ray diffraction measurements in the energy dispersive mode were used to study the ordered face-centered tetragonal L10 phase formation in [Fe(19Å)/Pt(25Å)]10 multilayers prepared by ion-beam sputtering. With the in situ X-ray measurements it was observed that (i) the multilayer structure first transforms to a disordered FePt and subsequently to an ordered fct L 10 phase, (ii) the ordered fct L 10 FePt peaks start to appear at 320C annealing, (iii) the activation energy of the interdiffusion was 0.8eV and (iv) ordered fct FePt grains have preferential out-of-plane texture. The magneto-optical Kerr effect and conversion electron Mössbauer spectroscopies were used to study the magnetic properties of the as-deposited and 400C annealed multilayers. The magnetic data for the 400C annealed sample indicate that the magnetization was at an angle of ~50° from the plane of the film.
In situ X-ray Reflectivity and Grazing Incidence X-ray Diffraction Study of L10 Ordering in 57Fe/Pt Multilayers. V.R.Reddy, A.Gupta, A.Gome, W.Leitenberger, U.Pietsch: Journal of Physics - Condensed Matter, 2009, 21, 186002