Facile synthesis of PVA-MnFe2O4 nanocomposite: Its magnetic investigation
2013 (English)In: Materials research bulletin, ISSN 0025-5408, E-ISSN 1873-4227, Vol. 48, no 10, 4066-4071 p.Article in journal (Refereed) Published
Manganese ferrite (MnFe2O4)-polyvinyl alcohol (PVA) nanocomposite was prepared by a PVA assisted sot-gel auto-combustion method. The magnetic core of the carriers was manganese ferrite (MnFe2O4), with average crystallite size of 9.1 +/- 2.1 nm. The PVA-MnFe2O4 nanocomposite exhibited superparamagnetic behavior at room temperature and ferromagnetic behavior at low temperatures. Zero-field-cooled and field-cooled measurements further confirm the superparamagnetic behavior with a blocking temperature of 160 K. The lower reduced remanent magnetization values than theoretical value of 0.5 indicate that the PVA/MnFe2O4 nanocomposite used in this study has uniaxial anisotropy rather than the expected cubic anisotropy according to the Stoner-Wohlfarth model. The calculated magnetic anisotropy constant of the sample is similar to 1.45 x 10(6) erg/cm(3) which is significantly higher than that of the bulk MnFe2O4 due to the strong magnetic coupling between magnetic core and surface spins.
Place, publisher, year, edition, pages
2013. Vol. 48, no 10, 4066-4071 p.
Magnetic materials, Nanostructures, Sol-gel chemistry, Impedance spectroscopy, Magnetic properties
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-129611DOI: 10.1016/j.materresbull.2013.06.047ISI: 000324077700066ScopusID: 2-s2.0-84882267023OAI: oai:DiVA.org:kth-129611DiVA: diva2:653445
QC 201310042013-10-042013-10-032013-10-04Bibliographically approved