Size-dependent magnetic properties of high oxygen content YMn2O5 +/-delta multiferroic nanoparticles

TitleSize-dependent magnetic properties of high oxygen content YMn2O5 +/-delta multiferroic nanoparticles
Publication TypeJournal Article
Year of Publication2009
AuthorsMa C, Yan JQ, Dennis KW, McCallum RW, Tan X
Journal TitleJournal of Applied Physics
Date Published02/01
ISBN Number0021-8979
Accession NumberISI:000263409700063
Keywordsbifeo3 nanoparticles, exchange-bias, ferromagnetic materials, heterostructures, magnetic particles, magnetic transitions, manganese, multiferroics, nanoparticles, nanotechnology, particle size, particle-size, pbtio3, phase-transition, y, yttrium compounds

The effect of particle size on magnetic properties in single-crystalline multiferroic YMn2O5.07 nanoparticles was investigated. A modified Pechini's method was employed to synthesize YMn2O5.07 powders with different particle sizes under an atmosphere of 10 bar O-2. It was found that the multiferroic YMn2O5.07 compound displays a profound size dependence in its magnetic properties when the particles were smaller than 160 nm. With a decrease in particle size, a ferromagnetic-like phase with a broad transition emerges and the transition temperature increases. This ferromagnetic-like phase might be attributed to the surface layer of the nanoparticles and the broad magnetic transition could be caused by the dispersion of particle size and the size dependence of the transition temperature.

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