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The Nature of Magnetic State of Small Fe3O4 NanoparticlesKeywords: magnetite Fe3O4 , nanoparticles , magnetic properties , superspin glass Abstract: We have investigated the nature of the magnetic state of 4 nm and 7 nm magnetite Fe3O4 nanoparticles and show that they form a collective superspin glass state. Magnetic force on the nanoparticles relevant to the tumor targeting application was determined as well.
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