Search academic texts

Information × Registration Number 0222U001740, 0119U000120 , R & D reports Title The formation of structure, magnetic properties of nanoscale FePt(Pd) films by hydrogen heat treatmant for information magnetic recording of a high density popup.stage_title Head Makogon Iurii Mykolayovich, Доктор технічних наук Registration Date 02-02-2022 Organization National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" popup.description2  Using a set of modern methods of physical materials science - X-ray diffraction phase analysis, X-ray reflectometry, Secondary Neutral Mass Spectrometry, Rutherford backscattering, electronography (HREED method), Transmission electron microscopy, Atomic force and Magnetic force microscopy, SQUID-magnetometry, electronic paramagnetic resonance- the phase transformation, magnetic states and magnetic properties has been investigated in nanoscale FePd((5-х) nm)/Me(х=0; 0,3; 0,6; 0,9 nm) (Me = Ag, Au, Cu) films and layered Fe/Pd, Pd/Fe, Fe/Me/Pt(Pd), Pt(Pd)/Me/Fe structures with a total thickness of up to 40 nm on SiO2(100 nm)/Si(001) and SiO2(200 nm)/Si(001) after annealing in vacuum, rapid thermal annealing (RTA) in N2, heat treatment in hydrogen and complex heat treatment (RTA + H2, RTA + vacuum). The scientific foundations for the accelerated formation of nanoscale, thermally stable films based on FePd, FePt with a magnetic-hard L1о phase for use as a medium of high-density magnetic recording have been created. The influence of the chemical and mechanical factor of hydrogen action on the phase composition and structure, as well as the physical factor of the effect on the electronic structure of nanoscale films based on FePt and FePd doped with Au, Ag, Cu, and their magnetic properties was estimated and taken into account. This made it possible to propose a new scientific approach to the use of hydrogen heat treatment in nanoscale films based on FePt and FePd to limit the undesirable effect of the nanoscale factor, that slows down the ordering processes with decreasing of thickness and accelerate the diffusion processes formation of thermostable, nanosized, magnetically hard films based on FePt, FePd. Practical recommendations have been developed for the use of annealing in hydrogen to control the kinetics and degree of ordering in diffusion processes of the magnetic hard L1о phase formation with the required orientation of the crystal lattice, with an easy c-axis Product Description popup.authors Verbytska Marina Yuriivna Verbуtska Tetyana Ivanivna Makohon Yurii Mykolaiovych Makushko Pavlo Volodymyrovich Shamis Mark Natanovich popup.nrat_date 2022-03-09 Close