Paramagnetic to ferromagnetic transition and superparamagnetic blocking in Ni(OH)2 nanoparticles

Details Paramagnetic to ferromagnetic transition and superparamagnetic blocking in Ni(OH)2 nanoparticles Paramagnetic to ferromagnetic transition and superparamagnetic blocking in Ni(OH)2 nanoparticles

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvb..77v4430t&link_type=abstract

Physical Review B, vol. 77, Issue 22, id. 224430

Physics

5

Nanoparticles, Nanocrystals, Magnetic Field And Magnetism

Scientific paper

We report the temperature, field, and time dependence of magnetization on sol-gel prepared nanoparticles of Ni(OH)2 . At higher temperature the system is found to behave as a paramagnet. As we lower the temperature the system undergoes paramagnet to ferromagnet transition. We also find evidence for superparamagnetic blocking on further lowering the temperature. We try to discuss the underlying mechanism.

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