Abstract
The objective of this study is to calculate the parameters of strong exchange interactions within magnetic nanoparticles and weak (dipolar + anisotropic) interactions for the patterns of nanoparticles injected into non-magnetic substrate. The Fe–Pt magnetic system was chosen as the best applicable for this purpose. However, computations done in this work may be extended to the other f.c.c. magnetic systems. In this paper, we estimated the parameters of exchange interactions within the magnetic Fe–Pt nanoparticles close to equiatomic composition with 4–10 nm in diameter. Size effect for exchange interaction parameters was found. Temperature dependences of spontaneous magnetizations for Fe and Pt subsystems of nanoparticles with different sizes at fixed equiatomic composition were obtained. Total magnetic energies of weak interactions between Fe and Pt nanoparticles injected different matrixes were also estimated. Magnetic moment ordering temperature was evaluated within the simple model for ordered and disordered Fe–Pt nanoparticles of various sizes (4–10 nm) separated by different interparticle distances (30–50 nm).
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