Breaching the work output of ferromagnetic shape memory alloys
by
Yaniv Ganor, Doron Shilo, Thomas W. Shield and Richard D. James
in
Applied Physics Letters, 93, 122509, 2008.
Category: Journal Article
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Abstract:
One important parameter that quantifies the performance of ferromagnetic shape memory alloys is the blocking stress. To date, the low blocking levels (<5 MPa) impede the utilization of these alloys in applications where high work output is required. In this paper, we demonstrate an increase in the blocking stress by more than 100% by reducing the actuator size. A new theoretical model shows that smaller specimens have increased values of the blocking stress due to an enhancement in the energy barrier to magnetization rotation and indicates on a fundamental relationship among the specimen size, its microstructure, and its physical properties
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