Memory and aging effects in antiferromagnetic nanoparticles
نویسنده
چکیده
We investigate the slow dynamics of polydisperse antiferromagnetic NiO nanoparticles using Monte Carlo simulations. The zero-field cooled and field cooled magnetizations exhibit the size-dependent fluctuations. We find memory effects and very weak aging effects in a noninteracting polydisperse assembly of nanoparticles. The relaxation measurements of magnetization after a sudden cooling, heating and removal of fields validate the memory effects. We find that the role of sizedependent magnetization fluctuations in various relaxation processes of assembly of antiferromagnetic nanoparticles is unavoidable. We also study the role of polydispersity and size-dependent magnetization fluctuations on the system using single peak and two-peak size lognormal distributions. PACS numbers: 75.50.Ee, 75.50.Tt, 74.40.+k, 75.75.+a, 75.40.Mg Memory and aging effects in antiferromagnetic nanoparticles 2
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تاریخ انتشار 2009