Fig. 4: Correlative experimental and computational magnetic feature analysis from the microscale to the nanoscale in the A-MCA material.
a Evolution of the magnetic domain pattern recorded using MOKE microscopy under different applied magnetic fields and a correlative EBSD-KAM map. b High-resolution MOKE images and a corresponding EBSD-IPF map recorded from the region marked by the orange dashed frame in a. c Correlative AFM-MFM images showing magnetic domain features adjacent to the cold rolling-induced twinning region, corresponding to the black dashed frames in b. d Lorentz TEM analysis. Left and middle: in-focus and underfocus Fresnel images of magnetic domain walls. Right: underfocus Fresnel image recorded after saturating the sample. The defocus used to record each image was 1 mm. e Fresnel image (left) and corresponding magnetic induction map measured using off-axis electron holography (middle) of a magnetic flux closure state. The contour lines have a spacing of 2π radians and show the projected in-plane magnetic induction. The magnetic domain wall width δw was determined by fitting a function to the differential of the electron optical phase shift measured using off-axis electron holography (right, inset). f Simulated 3D magnetic configurations, highlighting the exchange interaction between the fcc matrix and the morphologically anisotropic nanoprecipitates. The magnetization vector direction and color denote the local magnetization direction and magnitude, respectively.
