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Thermoinduced magnetization in nanoparticles of antiferromagnetic materials.

We show that there is a thermoinduced contribution to the magnetic moment of nanoparticles of antiferromagnetic materials. It arises from thermal excitations of the uniform spin-precession mode, and it has the unusual property that its magnitude increases with increasing temperature. This has the consequence that antiferromagnetism is nonexistent in nanoparticles at finite temperatures and it e...

Memory and aging effects in antiferromagnetic nanoparticles

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, heatin...

Magnetic Properties of Cluster Glassy Ni/NiO Core–Shell Nanoparticles: an Investigation of Their Static and Dynamic Magnetization

We review the phenomenology of the exchange bias and its related effects in core-shell nanocrystals. The static and dynamic properties of the magnetization for ferromagnetic Ni-core and antiferromagnetic NiO-shell cluster glassy nanoparticles are examined, along with the pinning-depinning process, through the measurement of the conventional exchange bias, and associated with different cooling f...