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Technology update

Nov 22, 2007

Making hard nanoparticles the easy way

Researchers have finally succeeded in making hard magnetic nanoparticles based on samarium-cobalt (SmCo), a technologically important magnetic material. J Ping Liu and colleagues at the University of Texas achieved their feat using a simple ball milling technique where the particles were suspended in a surfactant. The particles show a narrow size distribution, which leads to a significant room-temperature coercivity – a magnetic material's resistance to demagnetization.

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