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Impact of Interfacial Magnetism on Magnetocaloric Properties of Thin Film Heterostructures



Brian J. Kirby, June W. Lau, D. V. Williams, C. A. Bauer, Casey W. Miller


Polarized neutron reflectometry was used to determine the depth profile of the magnetic moment per Gd atom, MGd, in a Gd(30 nm)/W(5 nm) multilayer. Despite sharp interfaces observed by Transmission Electron Microscopy, mGd is systematically suppressed near the Gd-W interfaces. Because the peak magnetic entropy change is proportional to M{2/3}Gd, this results in a reduction of the maximum achievable magnetocaloric effect in Gd-W heterostructures. By extension, our results suggest that creating materials with Gd-ferromagnet interfaces may increase the MGd relative to the bulk, leading to enhanced magnetocaloric properties.
Applied Physics Letters


magnetocalorics, polarized neutron scattering


Kirby, B. , Lau, J. , , D. , , C. and , C. (2011), Impact of Interfacial Magnetism on Magnetocaloric Properties of Thin Film Heterostructures, Applied Physics Letters, [online], (Accessed June 18, 2024)


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Created March 17, 2011, Updated February 19, 2017