Publication Type:Journal Article
Source:Applied Physics Letters, Volume 93, Number 23 (2008)
Keywords:Applied magnetic fields, Epitaxial strains, Focused Ion Beam etchings, Gallium alloys, Heusler, Magnetic controls, Magnetic fields, Magnetic thin films, Martensite transitions, Phase transformation behaviors, Shape memory compounds, Sputtered films, stoichiometry, Twin boundaries, Twin morphologies, Twin structures, Twinning structures
Twin structure engineering in sputtered films close to the Heusler stoichiometry Ni2 MnGa (001) is used to demonstrate temperature and magnetic control of the phase transformation behavior. A custom heating apparatus integrated with a commercial microscope allows the observation of the austenite-martensite transition in epitaxially clamped films. Intermartensitic twin boundaries on cantilevers released from the epitaxial strain by focused ion beam etching are shown to move in response to an applied magnetic field with a strength of 0.6 T. We also report the observation of two coexisting twin morphologies. © 2008 American Institute of Physics.
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