Abstract: Disclosed magnetic shape-memory compositions that comprise a polymer matrix and a population of hard-magnetic particles dispersed within the polymer matrix. In some embodiments, the magnetic shape-memory compositions can further comprise a population of auxiliary magnetic particles (e.g., ferrite particles) dispersed within the polymer matrix. The compositions can exhibit 1) reversible, fast, and controllable transforming deformation, 2) shape-locking, and 3) reprogramming capabilities.

Abstract: Described herein are unit cells including a base plate; a top plate; and a lumen extending longitudinally from the base plate to the top plate, the lumen defined by a side wall formed from a plurality of cojoined panels extending between a bottom surface of the top plate and a top surface of the base plate. The unit cell can be magnetically actuatable, such that the unit cell can be reversibly transitioned between a contracted configuration, an extended configuration, or a combination thereof using an applied magnetic field.