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- W1974216811 abstract "A technique of pure nanoparticle preparation has been explored by forming first small metal particles under high pressure sputtering and then embedding them into a sputtered film matrix. The tandem deposition method is used where the sputtered matrix is deposited at an argon pressure of 5 mTorr and the particles are formed within a specially designed gun at a pressure of 1 Torr and then deposited. The particle-matrix compositional limitations of reactivity and miscibility are thus reduced. The new technique was applied to dysprosium metal particles in an aluminum matrix. The absence of the antiferromagnetic transition for particles with sizes of 4–12 nm was observed. The 4 nm particles behaved superparamagnetically, while the larger 12 nm particles showed coercivities over twice as large as that of the bulk material at cryogenic temperatures. The success of the technique is demonstrated by having been able to carry out the study on the dysprosium-aluminum system that normally reacts, preventing the existence of pure Dy particles." @default.
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- W1974216811 date "1999-03-08" @default.
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- W1974216811 title "Preparation and characterization of Dy nanoparticles" @default.
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