Fig. 2: Buckling instability-encoded heterogeneous magnetization in strip magneto-elastomer.
a Demonstration of the original strip structure, its buckled state, and geometric transformation. The magnetic flux density profiles of the structure before and after magnetization are measured by magneto-optical sensor. The modeling results show the deformation of the strip structure under the stimuli from solvent and external magnetic field, and the magnetization profiles of the strip. B represents the applied magnetic field. b–d The quantitative relationship between wavelength, amplitude of the strip structure and the geometric parameters of the structure including length (b), height (c), thickness (d). The gray area in Fig. 2b represents no wavy pattern generated in the elastomeric structure. e–f The quantitative relationship between the magnetic field strength (e), direction angle (θ) of magnetic field and amplitude of the buckling structure (f). The inset images illustrate experimental and simulation results. The inset image with label ‘1’ shows twisted strip structures when the direction angle is equal to 90◦. The inset image with label ‘2’ shows collapsed strip structures with the height of 5.0 mm when the direction angle is equal to 180◦. The inset image with label ‘3’ shows the wavy patterns of strip structures with the thicknesses of 1.6 mm when the direction angle is equal to 180◦. Error bars stand for the standard error of the mean with the number of trials n = 3. εmax is the maximum principal strain. The scale bar is 5 mm.
