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Nanoparticles of FePt with diameter of 3 nm, even after heat treatment at 600 °C for 0.5 h in N 2 atmosphere, were fabricated by using mesopores of the MCM-41 molecular sieve as nano-reactors. An assembly of the FePt nanoparticles isolated by dielectric SiO 2 capping layer exhibited superparamagnetic behavior. The uniaxial magnetocrystalline anisotropic constant was estimated to 5...
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