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Abstract
The conversion of ferrimagnets to quantum superparamagnets in extremely anisotropic spinel ferrite (MOFe 2O 3) nanoparticles becomes saliently from quantum tunneling on applying a transverse microwave magnetic field or implicitly by a strong internal anisotropic field perpendicular to the easy axis at low temperatures. The quantum critical behavior of CoFe 2O 4 nanoparticles is prominently observed from the spin resonance spectra and magnetization measurements at low temperatures. The fascinating interplay between thermal and quantum fluctuations in the vicinity of a quantum critical point is clearly realized from the inherited high anisotropic field of Co ferrite nanoparticles. A blocking of quantum superparamagnetic state of fractured domains is observed at much lower temperatures attributing to the quantum splitting of a single domain into multi domains.
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