6% magnetic-field-induced strain by twin-boundary motion in ferromagnetic Ni-Mn-Ga

Journal Article · Mon Aug 07 00:00:00 EDT 2000 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1306635· OSTI ID:20217173

Murray, S J ^[1]; Marioni, M ^[1]; Allen, S M ^[1]; O'Handley, R C ^[1]; Lograsso, T A ^[2]

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1. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
2. Ames Laboratory, United States Department of Energy, Iowa State University, Ames, Iowa 50014 (United States)

Field-induced strains of 6% are reported in ferromagnetic Ni-Mn-Ga martensites at room temperature. The strains are the result of twin boundary motion driven largely by the Zeeman energy difference across the twin boundary. The strain measured parallel to the applied magnetic field is negative in the sample/field geometry used here. The strain saturates in fields of order 400 kA/m and is blocked by a compressive stress of order 2 MPa applied orthogonal to the magnetic field. The strain versus field curves exhibit appreciable hysteresis associated with the motion of the twin boundaries. A simple model accounts quantitatively for the dependence of strain on magnetic field and external stress using as input parameters only measured quantities. (c) 2000 American Institute of Physics.

• OSTI ID: 20217173
• Journal Information: Applied Physics Letters, Vol. 77, Issue 6; Other Information: PBD: 7 Aug 2000; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL ALLOYS
MANGANESE ALLOYS
GALLIUM ALLOYS
TWINNING
STRAINS
MAGNETIC FIELDS
FERROMAGNETIC MATERIALS
HYSTERESIS
EXPERIMENTAL DATA