0804020 McHenry

1. Room Temperature Magnetocaloric Materials without Rare Earth ElementsMichael E. McHenry, Carnegie-Mellon University, DMR 0804020 The observation of a giant magnetocaloric effect in rare-earth compounds has stimulated the magnetocaloric research in the last two decades. However, the high price of rare-earth elements and their proclivity to corrosion have prevented their commercial use. To reduce raw materials cost, transition metal-based alloys are investigated to replace rare earth-based materials. Environmental, substitution for scarce and strategic elements, and cost considerations all speak to potential contributions of these new materials to sustainability. Among these, Fe-based soft amorphous alloys and γ-FeNi are believed to be the most promising magnetic refrigerants operating near room temperature [1]. [1] Huseyin Ucar, John, J. Ipus, V. Franco, M. E. Mchenry and D. E. Laughlin, Journal of Metals, 64, 782, (2012) [2] N. J. Jones, H. Ucar, J. J. Ipus, M. E. McHenry, and D. E. Laughlin J. Appl. Phys. 111, 07A334 (2012)

2. The Effect of Mo Additions on Structure and Magnetocaloric Effect in γ-FeNi NanoparticlesMichael E. McHenry, Carnegie-Mellon University, DMR 0804020 Mark Craven (left) of Carlow College worked with CMU MSE graduate student Huseyin Ucar (right) through the CMU MRSEC summer REU program. Mark worked to develop new g-FeNi magnetocaloric materials with near room temperature Curie temperatures. He also investigated the RF heating of these materials for applications in cancer thermotherapies. Work has been submitted for the 2013 MMM/Intermag Conference to be held in Chicago, Illinois [3]. [3] H. Ucar, M. Craven, M. E. McHenry, and D. E. Laughlin, Abstract Submitted to Joint MMM/Intermag Conference (2013)