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Novel Nanostructures for High-Energy Permanent Magnets Jeffrey E. Shield, University of Nebraska-Lincoln, DMR 0804744.

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  1. Novel Nanostructures for High-Energy Permanent Magnets Jeffrey E. Shield, University of Nebraska-Lincoln, DMR 0804744 Many modern technologies such as consumer electronics and hybrid/electric vehicles require the use of high-energy permanent magnets. The magnetic performance critically depends on the grain size and phases present. Both materials processing and alloying additions strongly influence these factors. In this project, we are working to control the microstructure of Sm-Co-based permanent magnets, a material important for high-temperature applications. The goal is to reduce the amount of Sm while producing superior performance. We use rapid solidification combined with alloy development to advance the field. Combined chromium and carbon additions reduce the grain size and increase coercivity (top figure). Heat treatment led to an increase and then a decrease in magnetic performance, the latter due to an inhomogeneous microstructure (bottom figure). 1 mm Captions: (top) The as-solidified coercivity depended on carbon content. (bottom) Transmission electron microscopy showed two distinct grain sizes. 100 mm

  2. Novel Nanostructures for High-Energy Permanent Magnets Jeffrey E. Shield, University of Nebraska-Lincoln, DMR 0804744 Ph.D. student Hellen Jiang actively promotes her field to underrepresented groups. She is pictured (she is on the left) in the promotional poster for the 2012 “Women in Physics” conference that is held annually at UNL. She serves as mentors to undergraduate researchers in the Shield group as well. This grant has supported M.S. students Wendy Keeler and Brian Dick and current Ph.D. student Jiang, as well as visiting scientist Dr. Shampa Aich from IIT-Kharagpur. REU and RET supplements support undergraduate students Miranda Barr, Eldon Summerson, and Evan Brown, as well as high school science teacher Pam Rasmussen. REU Site participant Joy Chao also worked on the processing/structure relationships in rare earth permanent magnets.

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