Fig. 4: Estimation of curvature/strain-induced azimuthal uniaxial magnetic anisotropy using electrical (AMR) signal.
From: Self-assembly as a tool to study microscale curvature and strain-dependent magnetic properties
a-i Optical image of the planar magnetic stripe with contact wires fabricated on top of the polymeric platform. a-ii,iii,iv Optical images of magnetic stripe after rolling down the polymeric platform with different diameters. Scale bar, 100 µm. Depending on the diameter of the tube, the magnetic stripe may be displaced from the tube’s dome as indicated by the blue arrows. The stripe in the case of a-ii is hidden under the polymeric tube. The red dashed lines in the images show the position from the bottom where the sacrificial layer starts in the planar polymeric platform. b AMR hysteresis measured for rolled stripes of different curvatures. c Estimated azimuthal uniaxial magnetic anisotropy, derived from the measured AMR signal vs. strain in the magnetic stripes. The error bars along the x- and y-axis represent the least count errors resulting from the measurement of bilayer (PI/Ni78Fe22) thicknesses, the radius of curvature, and AMR hysteresis measurements, respectively.
