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Title: dc- and ac-magnetic field-induced strain effects in ferromagnetic shape memory composites of Ni–Mn–Ga single crystal and polyurethane polymer
Authors: Zeng, M
Or, DSW 
Chan, HLW 
Keywords: Ferromagnetic materials
Gallium alloys
Internal stresses
Magnetic multilayers
Magnetomechanical effects
Manganese alloys
Nickel alloys
Sandwich structures
Shape memory effects
Issue Date: 1-May-2010
Publisher: American Institute of Physics
Source: Journal of applied physics, 1 May 2010, v. 107, no. 9, 09A942, p. 1-3 How to cite?
Journal: Journal of applied physics 
Abstract: Ferromagnetic shape memory composites of multilayer and sandwich types were fabricated by laminating Ni–Mn–Ga single-crystal plates with polyurethane (PU) polymer plates. The dc- and ac-magnetic field-induced strains (MFISs) in the composites were measured as functions of both magnetic field and mechanical load, and the results were compared with those of the single crystal. It was found that the load-free dc-MFISs were 5.6%, 1.5%, and 0.8%, while the load-free ac-MFISs were 0.3%, 0.8%, and 0.5% in the single crystal, multilayer composite, and sandwich composite, respectively. The relatively smaller load-free dc-MFISs and larger load-free ac-MFISs in the composites than the single crystal originated from the stress bias of the Ni–Mn–Ga plates by the PU plates in the composites. The dc-MFISs of all samples and the ac-MFISs of the composites decreased with the increase in mechanical load amplitude, while the ac-MFIS of the single crystal peaked at 1.6 MPa load.
ISSN: 0021-8979 (print)
DOI: 10.1063/1.3357408
Rights: © 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in M. Zeng, S.W. Or & H.L.W. Chan, J. Appl. Phys. 107, 09A942 (2010) and may be found at
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