Oscillation phenomenon of transition temperatures of coupled magnetic planes
محل انتشار: مجله پژوهش فیزیک ایران، دوره: 4، شماره: 2
سال انتشار: 1382
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 282
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شناسه ملی سند علمی:
JR_PSI-4-2_012
تاریخ نمایه سازی: 30 دی 1397
چکیده مقاله:
Oscillatory behavior of transition temperature in supper lattice, Ni/Au/Ni, has been observed as a function of spacer layer, Au. The observed oscillation period is almost the half period of interlayer exchange coupling. The high temperature susceptibility of a two - dimensional lattice is evaluated within the Bethe-Peierls-Wiess approximation in the presence of a random field with square distribution. This susceptibility is used to evaluate the transition temperature of coupled planes as a function of spacer thickness. The calculated transition temperature of coupled planes oscillates as half period of interlayer exchange coupling and falls below the results of the uncoupled films at some values of the average spacer thickness that were experimentally observed. Additionally, the transition temperature depends on the distribution function of random field at the small thickness of spacer.
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نویسندگان
h moradi
Department of Physics, School of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran