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Recent Developments in Rare Earth Lean/Free Permanent Magnets

Recent Developments in Rare Earth Lean/Free Permanent Magnets

Datum: 20. Januar 2015 17:15

Ort: Heisenbergstr. 1, Stuttgart-Büsnau, Hörsaal 2D5

Veranstalter: Physikalisches Kolloquium (MPI)

Recent Developments in Rare Earth Lean/Free Permanent Magnets
George C. Hadjipanayis, University of Delaware, Newark

Permanent magnets (PMs) are indispensable for many commercial applications including the electric, electronic and automobile industries, communications, information technologies and automatic control engineering. Worldwide demand for high performance permanent magnets has increased dramatically in the past few years driven by hybrid and electric cars, wind turbines and other power generation systems. The recent rare earth crisis has led to worldwide efforts to develop rare earth-lean/free permanent magnets. This talk will address the major principles guiding the development of PMs and review current research efforts in developing rare earth-lean/free PMs. In our lab we are using both the top down and bottom-up approach to develop exchange-coupled nanocomposite PMs, consisting of a fine mixture of phases with high magnetization and large magnetic hardness. The talk will also summarize ongoing research efforts to develop rare earth-free permanent magnets focused on Mn-based compounds with high anisotropy.

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