Papers by Keyword: Atomic Ordering

Abstract: Phase composition, crystal structure and magnetic properties of ordering FePd and Fe₅₀Pd_50-xPt_x (х = 1-10 atomic %) alloy films were studied. Spectral dependencies of Faraday rotation and optical absorption were measured. We studied how thermal treatment affects crystal structure, magnetization and coercive force in ordered alloys and how the degree of atomic order affects the value of perpendicular magnetic anisotropy. It was shown that near equiatomic ordered FePd and Fe₅₀Pd_50-xPt_x (х = 1-10 at. %) alloy films can be used as medium for magnetic and thermo-magnetic data recording.

Abstract: Superstructure transformation processes in intermetallics have beenstudied at the atomistic scale using Monte Carlo algorithms within two dis-tinct models: two-body interactions Ising-like system and Analytic Bond-Order Potentials. The transformation from “in-plane” to “off-plane” L10 vari-ant in [001]-oriented FePt nano-layers was observed and analysed by analyt-ical calculations providing clear explanation of the origin of the process, aswell as by “rigid-lattice” and “off-lattice” Monte Carlo simulations showingthe kinetics of the superstructure transformation.

Abstract: Magnetic properties of Ni3Al1-yMny alloys at y≤0.6 were investigated at T≤400 K in magnetic fields H≤4 MA/m. The concentration y dependencies of the spontaneous magnetic moment s, the effective magnetic moment eff, the Curie temperature ТС, the Weiss constant , and the temperature independent part of the magnetic susceptibility 0 were determined. The behavior of the Rhodes-Wohlfarth parameter р(y) in the transition region from the itinerant electron magnetism to the spin localized one is related to the increase in the spontaneous magnetic moment of Ni atoms inversely proportional to the average distance between Mn atoms with the highly localized magnetic moments.