Magnetic properties of CoFe2O4 nanoparticles synthesized through a block copolymer nanoreactor route

Sufi R. Ahmed, S. B. Ogale, Georgia C. Papaefthymiou, Ramamoorthy Ramesh, Peter Kofinas
2002 Applied Physics Letters  
The development of self-assembled magnetic CoFe 2 O 4 nanoparticles within polymer matrices at room temperature is reported. Diblock copolymers consisting of poly ͑norbornene͒ and poly ͑norbornene-dicarboxcylic acid͒ ͑NOR/NORCOOH͒ were synthesized. The self-assembly of the mixed metal oxide within the NORCOOH block was achieved at room temperature by processing the copolymer nanocomposite using wet chemical methods. Morphology and magnetic properties were determined by superconducting quantum
more » ... onducting quantum interference device magnetometry, transmission electron microscopy, wide angle x-ray diffraction, and 57 Fe Mössbauer spectroscopy. The CoFe 2 O 4 nanoparticles are uniformly dispersed within the polymer matrix, and have an average radius of 4.8Ϯ1.4 nm. The nanocomposite films are superparamagnetic at room temperature and ferrimagnetic at 5 K.
doi:10.1063/1.1456258 fatcat:gtvbc2kckva4tlqo5gxolf6h2m