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Information × Registration Number 0212U008249, 0110U001316 , R & D reports Title The formation of stable nanodimensional FePt film for ultra high density magnetic recording and information storage popup.stage_title Head Makogon Iurii Mykolayovich, Registration Date 06-12-2012 Organization Faculty of аircraft and space systems NTUU "KPI" popup.description2 By the complex used modern methods of Material Science - X-ray diffraction, resistometry (four-probe method), X-ray reflectometry, TEM, SIMS, RBS, AFM and MFM, SQUID - magnitometry, МОКЕ and ferromagnetic resonance were investigated interlayer interaction, phase transitions and magnetic properties in Fe50Pt50(30 nm), Fe50Pt50(15 nm)/Mе(x nm)/Fe50Pt50(15 nm), Pt(15 nm)/Mе(x nm)/Fe(15 nm), where Ме is intermediate layers of Ag, Au, Cu by thickness of х = 0; 3; 7,5; 30 nm, Pt(15 нм)/Fe(15 нм)]2 nanoscaled films on the planar SiO2(100 nm)/Si(001) substrates after annealing in vacuum and nitrogen environment. A new approach to the diffusion formation of stable nanoscaled hard magnetic FePt films with chemically ordered phase L10 (FePt)FCT using additional layers of alloying elements (Ag, Au, Cu) with a low surface energy. The interface energy between the layers was used as an additional extra-drive force for acceleration of thermally-activated processes of chemical ordering FePt films and lower temperature (at 100 оС ) of phase transition from chemically disordered soft magnetic A1 (FePt)FCC phase to chemically ordered hard magnetic L10 (FePt)FCT phase with superstructure. It is shown the reasonable use of alloying elements (Ag, Au, Cu) with limited solubility in the FePt alloy for effective control by parameters and the crystal superlattice orientation, and also grain growth limit and the location of the easy magnification axis perpendicular to the substrate surface. It is carried out a complex experimental study of nanoscaled multilayer film compositions that allowed thus formed L10 (FePt)FCT phase with high coercivity (Hc ~ 20-30 kOe), saturation magnetization (~ 1500 emo/cm3), with rectangular shape of magnetization curve and Mr / Ms ratio close to 1 in the surface layers. Recommendations for the choice of technological parameters of the process of FePt films formation and stabilization, the application of which will help improve the density of magnetic recording and storage of information by thermal activated method writing to ~ 250 Gbit/cm2 instead of nowadays reached the 60 Gbit/cm2 are developed. Product Description popup.authors Вербицька тетяна Іванівна Макогон Юрій Миколайович Павлова Олена Петрівна Тихонович Володимир Броніславович popup.nrat_date 2020-04-02 Close