Energy-dispersive neutron imaging and diffraction of magnetically driven twins in a Ni2MnGa single crystal magnetic shape memory alloy

6th European Conference on Neutron Scattering

Kabra, Saurabh^1 ; Kelleher, Joe^1 ; Kockelmann, Winfried^1 ; Gutmann, Matthias^1 ; Tremsin, Anton^2

Rutherford Appleton Laboratory, ISIS Facility, Chilton

OX11 0QX, United Kingdom^1

Space Sciences Laboratory, University of California, Berkeley

CA

94720, United States^2

关键词: Energy dispersive;    Energy transmission;    Magnetic shape memory alloys;    Single-crystal neutron diffraction;    Spallation neutron sources;    Spatially resolved;    Transmission images;    Transmission spectrums;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012056/pdf
DOI  :  10.1088/1742-6596/746/1/012056

来源: IOP

【 摘 要 】

Single crystals of a partially twinned magnetic shape memory alloy, Ni2MnGa, were imaged using neutron diffraction and energy-resolved imaging techniques at the ISIS spallation neutron source. Single crystal neutron diffraction showed that the crystal produces two twin variants with a specific crystallographic relationship. Transmission images were captured using a time of flight MCP/Timepix neutron counting detector. The twinned and untwinned regions were clearly distinguishable in images corresponding to narrow-energy transmission images. Further, the spatially-resolved transmission spectra were used to elucidate the orientations of the crystallites in the different volumes of the crystal.