The influence of intergranular interaction on the magnetization of the ensemble of oriented Stoner-Wohlfarth nanoparticles - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




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Abstract: We consider the influence of interparticle interaction on the magnetizationreversal in the oriented Stoner-Wohlfarth nanoparticles ensemble. To do so, wesolve a kinetic equation for the relaxation of the overall ensemblemagnetization to its equilibrium value in some effective mean field. Latterfield consists of external magnetic field and interaction mean fieldproportional to the instantaneous value of above magnetization. We show thatthe interparticle interaction influences the temperature dependence of acoercive field. This influence manifests itself in the noticeable coercivity at$T>T {b}$ $T {b}$ is so-called blocking temperature. The above interactioncan also lead to a formation of the -superferromagnetic- state with correlateddirections of particle magnetic moments at $T>T {b}$. This state possessescoercivity if the overall magnetization has a component directed along the easyaxis of each particle. We have shown that the coercive field in the-superferromagnetic- state does not depend on measuring time. This timeinfluences both $T {b}$ and the temperature dependence of coercive field at$T


Author: A.A. Timopheev, S.M. Ryabchenko, V.M. Kalita, A.F. Lozenko, P.A. Trotsenko, V.A. Stephanovich, A.M. Grishin, M. Munakata

Source: https://arxiv.org/







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