The bimagnetic core-shell nanoparticles from a combination of hard phase CoFe2O4 and soft phase MnFe2O4 have been synthesized and their magnetic properties have been systematically studied. Both HRTEM and EDS results confirmed the formation of core-shell structured nanoparticles. The bimagnetic core-shell nanoparticles show very unique magnetic properties such as the blocking temperature and coercivity. The systematic and comparative studies on the magnetic properties of mechanical mixture of pure CoFe2O4 and MnFe2O4 nanoparticles, chemically mixed Co1-xMnxFe2O4 nanoparticles, and bimagnetic core-shell CoFe2O4@MnFe2O4 and MnFe2O4@CoFe2O4 nanoparticles will be discussed. The magnetic properties of other core-shell nanoparticles will also be discussed. The core-shell nanoparticles evidently demonstrate the rational design capability to separately control the blocking temperature and the coercivity by varying the materials, their combination and the volume ratio between the hard and soft phase, and switching hard or soft phase materials between the core and shell.

Control of magnetic properties of CoFe2O4 and MnFe2O4 spinel ferrite nanoparticles in a core-shell structure

244th National Meeting (2012)

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