Dynamic Observation of AC Actuation in Bulk Magnetic Shape Memory Materials

摘要

A study of actuation performance in bulk NiMnGa magnetic shape memory single crystals at various frequencies is presented. A dynamic actuation experimental setup with the ability to apply mechanical stress and alternating magnetic field perpendicularly is developed in cooperation with time-resolved microscopy. Reversible twin boundary motion activated in the frequency range up to 600Hz is directly observed. The maximum field induced strain increases with actuation frequency. No limit for high frequency applications is observed in this study.