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MA: Fachverband Magnetismus

MA 21: Magnetic Shape Memory Alloys I

MA 21.11: Talk

Wednesday, March 25, 2009, 12:45–13:00, HSZ 103

Observation of pulsed field induced twin boundary motion in bulk NiMnGa — •Ryan Yiu Wai Lai, Jeffrey McCord, Rudolf Schaefer, and Ludwig Schultz — Leibniz-Institute for Solid State and Materials Research, P.O.Box 270116, Dresden D-01171, Germany

A study of the twin boundary motion in bulk NiMnGa magnetic shape memory single crystals under pulsed magnetic fields with various rise-times is presented. A dynamic actuation experimental setup with the ability to apply mechanical stress and pulsed magnetic field perpendicularly is developed in cooperation with time-resolved microscopy. Reversible twin boundary motion activated by repetitive pulsed fields with rise-time down to 1 ms is directly observed. The maximum field induced strain increases with reducing rise-time. The mechanism of the enhancement of the twin boundary mobility will be discussed. Funding through the DFG priority program SPP1239 is gratefully acknowledged.