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SiO 2 -coated Co nanoparticles were synthesized; the different temperature-dependent magnetic behaviors between Co nanoparticles with and without inner Co-oxide cores were observed. For Co nanoparticles free of Co-oxide cores, the magnetization obeyed Bloch's T 3/2 law with a Bloch constant close to the bulk value; the coercivity exhibited a weak and linear dependence on...
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