Фазовий склад, структура і магнітні властивості нанорозмірних плівкових композицій FePt з додатковими шарами Au

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dc.contributor.authorВербицька, Марина Юріївна
dc.date.accessioned2019-11-20T13:19:54Z
dc.date.available2019-11-20T13:19:54Z
dc.date.issued2019
dc.description.abstractenThe work is devoted to definition of the phase composition formation regularities, structure and magnetic properties in nanoscale Fe50Pt50-Au films and multilayered [Pt/Fe]n (n = 1, 4, 8) compositions on SiO2(100 nm)/Si(001) and Al2O3 (1010) substrates at thermal annealings. It is established that by supervising of mechanical stresses level and their sign in Fe50Pt50 layer by change of a thickness, location, quantity of additional Au layers and annealing conditions (temperature, duration, speed of heating and atmosphere  vacuum, nitrogen, hydrogen) one can operate by ordering processes and phase compound formation, structure and magnetic properties of film compositions The variations in residual stresses/strains level and sign in the FePt layer of as-deposited films influense the change in the ordered L10-FePt phase formation temperature, structure and the coercivity in the film compositions. Increasing the level of compressive stresses in the Fe50Pt50 layer causes a decrease in the ordering temperature and improvement of the magnetic properties. It is established that oriented grain growth with c-axis of easy magnetization in the [001] direction perpendicular to the film plane at annealing in vacuum occurs in films with a smaller thickness of the intermediate Au(7.5 nm) layer due to the higher level of compressive strains in the deposited films. Increasing the thickness of the Au layer to 15 nm and reducing the level of compressive deformations contributes to the growth of FePt grains with the c-axis of easy magnetization in the plane of the film. The same orientation can be achieved by increasing the thickness of the intermediate Au layer to 30 nm. 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treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of hydrogen heat treatment accelerates It is revealed, that application of 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of hydrogenhydrogenhydrogenhydrogen hydrogenhydrogenhydrogen atoms atoms atoms atoms atoms in to L10-FePt phase crystal lattice FePt phase crystal latticeFePt phase crystal latticeFePt phase crystal latticeFePt phase crystal latticeFePt phase crystal lattice FePt phase crystal lattice FePt phase crystal lattice FePt phase crystal latticeFePt phase crystal latticeFePt phase crystal lattice FePt phase crystal latticeFePt phase crystal latticeFePt phase crystal latticeFePt phase crystal latticeFePt phase crystal latticeFePt phase crystal latticeFePt phase crystal lattice voidsvoidsvoidsvoidsvoids. Thus the c-axis of easy magnetization in L10-FePt phasephasephase phase grains is located in the film plane. Hydrogen treatment allows to obtain higher values of coercivity (27.3 kOe) in Fe50Pt50/Au/Fe50Pt50 film compositions at a lower annealing temperature of 700 °C than at annealing in vacuum (900 °C), due to the intensive penetration of hydrogen atoms into the film. It was determined that due to the action of the compressive stress during the diffusion of gold along the grain boundaries and the increase in the number of interfaces in films with an intermediate Au(7.5 nm) layer, the ordered L10-FePt phase formation temperature the can be reduced compared to the other Au layer location. In the films with various Au layer location (top, intermediate, under-) separated from the substrate, the same tendency of the A1→ L10 phase transformation temperature changing as in the films on the substrate is remained: the ordering temperature is lower in film with intermediate Au(7.5 nm) layer then in Au/FeAu/FeAu/FeAu/Fe 50 Pt 50 and and and and Fe 50 Pt 50 /Au filmsfilmsfilmsfilmsfilms. In this work it is also shown that the increase in the number of interfaces in [Pt/Fe]n film compositions, where n = 1, 4, 8, while maintaining the total film thickness, promotes the activation in diffusion processes and the formation of the disordered phase A1-FePt in the composition [Pt/Fe]4 and partially ordered regions with tetragonal distortions in the [Pt/Fe]8 composition already during deposition. Rapid thermal annealing of [Pt/Fe]n film compositions (where n = 4, 8) on SiO2(100 nm)/Si(001) substrates in nitrogen atmosphere leads to the oriented growth of L10-FePt phase grains with a c-axis of easy magnetization, located in [001] direction, perpendicular to film plane. The recommendations for controlling the stress state, the reduction of the temperature of the ordered L10-FePt phase formation, the obtaining of c-axis of easy magnetization oriented perpendicular or parallel to the film plane in the film based on FePt, application of which by thermal activated method will allow to increase the magnetic recording density and storage information were developeduk
dc.description.abstractruДиссертационная работа посвящена определению закономерностей формирования фазового состава, структуры и магнитных свойств в наноразмерных пленках Fe50Pt50-Au и многослойных композициях [Pt/Fe]n (n = 1, 4, 8) на подложках SiO2(100 нм)/Si(001) и Al2O3 при термических отжигах. Установлено, что контролируя уровень механических напряжений и их знак в слое Fe50Pt50 изменением толщины, расположения, количества дополнительных слоев Au, скорости нагрева и атмосферы при отжиге можно управлять процесами упорядочения и формированием фазового состава, структуры и магнитными свойствами в пленочных композициях. Применение водородной термообработки ускоряет процессы упорядочения в пленках Fe50Pt50/Au/Fe50Pt50, по сравнению с отжигом в вакууме, за счет создания дополнительных сжимающих напряжений при внедрении атомов водовода в пустоты кристаллической решетки фазы L10-FePt. При этом ось легкого намагничиваня c в зернах фази L10-FePt располагается в плоскости пленки. Быстрый термический отжиг пленочных композиций [Pt/Fe]n (где n=4, 8) на подложках SiO2(100 нм)/Si(001) в атмосфере азота приводит к ориентированному росту зерен фазы L10-FePt с осью легкого намагничивания c, расположенной в направлении [001], перпендикулярном плоскости пленки.uk
dc.description.abstractukДисертаційна робота присвячена визначенню закономірностей формування фазового складу, структури і магнітних властивостей в нанорозмірних плівках Fe50Pt50-Au та багатошарових композиціях [Pt/Fe]n (n = 1, 4, 8) на підкладках SiO2(100 нм)/Si(001) та Al2O3 (1010) при термічних відпалах. Встановлено, що контролюючи рівень механічних напружень та їх знак у шарі Fe50Pt50 зміненням товщини, розташування, кількості додаткових шарів Au, швидкості нагріву та атмосфери при відпалі (вакуум, азот, водень), можна керувати процесами упорядкування та формуванням фазового складу, структури та магнітними властивостями в плівкових композиціях. Застосування водневої термообробки прискорює процеси упорядкування в плівках Fe50Pt50/Au/Fe50Pt50 порівняно з відпалом у вакуумі за рахунок створення додаткових стискаючих напружень при втіленні атомів водню у пустоти кристалічної гратки фази L10-FePt. При цьому вісь легкого намагнічування c у зернах фази L10-FePt розташовується у площині плівки. Швидкий термічний відпал плівкових композицій [Pt/Fe]n (де n=4, 8) на підкладках SiO2(100 нм)/Si(001) в атмосфері азоту призводить до орієнтованого росту зерен фази L10-FePt з віссю легкого намагнічування c, розташованою в напрямку [001], перпендикулярному площині плівки.uk
dc.format.page28 с.uk
dc.identifier.citationВербицька, М. Ю. Фазовий склад, структура і магнітні властивості нанорозмірних плівкових композицій FePt з додатковими шарами Au : автореф. дис. … канд. техн. наук : 05.16.01 – металознавство та термічна обробка металів технічні науки / Вербицька Марина Юріївна. – Київ, 2019. – 28 с.uk
dc.identifier.urihttps://ela.kpi.ua/handle/123456789/30099
dc.language.isoukuk
dc.publisherКПІ ім. Ігоря Сікорськогоuk
dc.publisher.placeКиївuk
dc.subjectнанорозмірні плівкиuk
dc.subjectвідпалuk
dc.subjectвпорядкована фаза L10-FePtuk
dc.subjectдодатковий шар Auuk
dc.subjectкоерцитивна силаuk
dc.subjectnanoscaled filmsuk
dc.subjectannealinguk
dc.subjectordered L10-FePt phaseuk
dc.subjectadditional Au layeruk
dc.subjectcoercivityuk
dc.subjectнаноразмерные пленкиuk
dc.subjectотжигuk
dc.subjectупорядочена фаза L10-FePtuk
dc.subjectдополнительный слой Auuk
dc.subjectкоэрцитивная силаuk
dc.subject.udc539.216:537.65]:669(043.3)uk
dc.titleФазовий склад, структура і магнітні властивості нанорозмірних плівкових композицій FePt з додатковими шарами Auuk
dc.typeThesisuk

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