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Information × Registration Number 0210U003394, 0107U002245 , R & D reports Title Research of the phenomenon of giant magnetoresistance in multi-layered film standards. popup.stage_title Head Loboda Baleriy Borisovit, Кандидат фізико-математичних наук Registration Date 01-02-2010 Organization Sumy State Pedagogical University named by Makarenko popup.description2 It is revealed that all of the as-deposited three-layered films are polycrystalline with a small grain size (~ 10 nm). The as-deposited film systems on the basis of Co (Со/Cu/Со and Со/Ag/Со) consist of HCP-Co, FCC-Cu or FCC-Ag, accordingly; to the permalloy (FeNi/Cu/FeNi and FeNi/Ag/FeNi) - FCC-FeNi, FCC-Cu or FCC-Ag, accordingly. The lattice parameters are consistent with the proper parameters for massive metals. Nonmagnetic layers with the effective thickness dCu 2 nm and dAg 4 nm are structural-continuous. Annealing at 700 K leads to 5-20 times increase of grain size according to the layers thickness and type. For the annealed at 700 K systems based on Co, the FCC-Co lines are fixed on the electron diffraction patterns. For the FeNi/Cu/FeNi system a solid solution forming is fixed, and for the FeNi/Ag/FeNi system the phase composition change is not fixed by the electron diffraction method. It is theoretically revealed that in small values area of relation of the nonmagnetic and magnetic layers thickness d2/d1 the value of resistivity is determined by the character of charge carriers interaction with external limits and interfaces of the conductor. Approbation of the received analytical correlations showed that experimental dates conform to the calculation of almost 20%. Correlation for determination of the three-layered alloy films ТCR is suggested, and its values calculation for the films on the basis of Fe, Ni and Cu is conducted. It is revealed that the calculated TCR values conform to the experimental ones. The results of the based on Co, FeNi, Cu and Ag three-layered films magnetoresistive effect research showed that for as-deposited films with the thickness of dCu = 3-15 nm the giant magnetoresistance effect is realized. The GMR value for the heat-treated at the different temperatures three-layered films is determined by the layers thickness and type. It is found out that only for the Со/Cu/Co system at dCu 5 nm the transition of GMR in АМR is not observed even after standards annealing at 700 К. The maximum GMR value (4% at a room temperature) was received for annealing at 700 K Со/Cu/Co films. At decreasing of measuring temperature to 150 K the 1,3-2 times increase of GMR effect amplitude is observed. In the case of the Со/Cu(Ag)/Со and FeNi/Cu(Ag)/FeNi film systems the dependence of GMR effect amplitude on the nonmagnetic layer thickness has two maximums. In the studied structures the area of optimum (for obtaining maximum GMR effect) unmagnetic layer thickness is 3-7 nm. Product Description popup.authors Лобода В.Б. Хурсенко С.М. Шкурдода Ю.О. popup.nrat_date 2020-04-02 Close