Abstract
A modeling of the hysteretic properties of an ensemble of interacting La0.7Sr0.3MnO3 (LSMO) magnetic nanoparticles is carried out. The experimental data are processed in the framework of the Preisach model. In this approach the system is modeled as an ensemble of two-level elements (hysterons) characterized by a magnetic moment and effective fields hsw and hint, which specify the “energy profile” of the hysteron in configuration space. Each particular magnetic sample is distinguished by a unique hysteron distribution described by the Preisach function P(hsw,hint). A feature of the theory is that it incorporates effects due to thermal fluctuations and superparamagnetic behavior of the magnetic nanoparticles at temperatures higher than the blocking temperature. The theory faithfully reproduces the magnetostatic properties of the system of LSMO nanoparticles in the whole investigated range of temperatures T=130–300K and magnetic fields H=0–10kOe.
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