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Tailoring the FeRh Magnetostructural Transition

Tailoring the FeRh Magnetostructural Transition (A Materials World Network Project) Laura H. Lewis, Northeastern University, DMR 0908767.

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Tailoring the FeRh Magnetostructural Transition

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  1. Tailoring the FeRh Magnetostructural Transition(A Materials World Network Project) Laura H. Lewis, Northeastern University, DMR 0908767 Magnetostructural transitions, comprising simultaneous magnetic & structural phase changes, can deliver large functional effects in response to small changes in magnetic field, temperature and/or strain. Such materials may be incorporated into devices as networked environmental sensors for energy harvesting and energy management. Thermally-driven diffusion offers a route to tailor the magnetostructural transition in FeRh films. Au diffusion into FeRh films broadens & decreases the onset of the transition temperature as well as increases its sensitivity to applied magnetic field (Figs. 1-2). Associated synchrotron-based x-ray diffraction data confirm incorporation of Au into the FeRh lattice. Fig. 1. Thermal hysteresis loops of a 50-nm-thick FeRh film with a Au capping layer grown without thermal diffusion (“Au cold”, left) & with thermal diffusion (“Au hot”, right) Fig. 2. Magnetostructural transition temperature Tt vs. field data that confirms a decrease in Tt and increased sensitivity to applied field with Au incorporation into the lattice.

  2. Tailoring the FeRh Magnetostructural Transition (A Materials World Network Project) Laura H. Lewis, Northeastern University, DMR 0908767 The broader impact aspects of the project remain very strong. In July 2011 the U.S. team (Lewis, Heiman and Loving) traveled to the Diamond Synchrotron in the U.K. for investigations of the magnetic and structural profiles of FeRh films. Nate Mahlmeister (left), Northeastern University ChE student (2012) joined the team and is currently working on the project at Leeds University, UK, as an international co-op student in the laboratory of collaborator Chris Marrows. Over the reporting period four presentations were delivered by Ph.D. student Melissa Loving.Additionally, Melissa was chosen to attend the highly selective IEEE Summer School on Magnetics (New Orleans, May 2011) and the 2011 National School on Neutron and X-ray Scattering (Argonne/ORNL, June 2011) Melissa Loving & Nate Mahlmeister at the RASOR Station at the Diamond Synchrotron, Harwell, U.K.

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