2007•arXiv (Cornell University)Open access

Paramagnetic to Superparamagnetic Transition in Ni(OH)_2 Nanoparticles

S.D. Tiwari, K. P. Rajeev

Abstract

We report the temperature and field dependence of dc magnetization on sol-gel prepared nanoparticles of Ni(OH)_2. At higher temperature the system is found to behave as a paramagnet while we find evidence for superparamagnetic blocking at low temperature. The system shows a paramagnet-superparamagnet transition and we discuss the underlying mechanism.

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Key concepts: Superparamagnetism, Paramagnetism, Nanoparticle, Magnetization, Materials science, Condensed matter physics, Nuclear magnetic resonance, Nanotechnology