Nanostructuring is a promising pathway to the design of more sustainable permanent magnets with high energy products. To achieve this goal, we employ a bottom-up approach, in which binary nanomagnets are prepared in the form of a hard magnetic core (SrFe12O19, SmCo5, Nd2Fe14B) covered with a soft magnetic shell (Fe, Co). The core-shell nanoparticles are then hot-pressed into a bulk nanostructured material in a manner similar to a ceramic process. We are particularly interested in enhancing the energy product through the control of the size, shape, and magnetic anisotropy of the constituent nanoparticles. We report our initial efforts in this direction, i.e. the preparation of core-shell nanomagnets via single source microwave and high-temperature routes. The physical, structural and magnetic properties will be discussed.

Synthesis of nanosized permanent magnets

244th National Meeting (2012)

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