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MA: Fachverband Magnetismus

MA 3: Magnetic Materials I

MA 3.1: Vortrag

Montag, 26. März 2007, 10:15–10:30, H22

Melt-spun MnFe(P,Ge,Si) as a giant magnetocaloric material — •Oliver Gutfleisch, Wei Zhang, Julia Lyubina, and Ludwig Schultz — Leibniz Institute of Solid State and Materials Research Dresden (IFW Dresden), Institute of Metallic Materials, P.O. Box 270016, D-01171 Dresden, Germany

The giant magnetocaloric effect was studied in Mn1.1Fe0.9P0.8-xSixGe0.2 (x=0.1, 0.12, 0.13, 0.14) and Mn1.1Fe0.9P0.85-xSixGe0.15 (x=0.18, 0.2, 0.22) melt-spun ribbons. Thermal, structural and magnetic properties were investigated by SQUID, PPMS, XRD and SEM. The dependence of Curie-temperature, thermal and magnetic hysteresis, crystal lattice parameters and magnetic entropy changes on composition are described. It is demonstrated that melt-spinning [1,2] is a efficient and very simple processing route for MnFe(P,Ge,Si)-type materials, i.e. arsenic free Fe2P-type alloys [3], exhibiting large values of magnetic entropy change (|deltaS(m)|=45J/kgK) with very small magnetic hysteresis near room temperature.

[1] O. Gutfleisch et al., J. Appl. Phys. 97 (2005) 10M305. [2] A. Yan, et al., J. Appl. Phys. 99 (2006) 08K903. [3] D.T. Cam Thanh et al., J. Appl. Phys. 99 (2006) 08Q107.