superparamagnetic

Physics

Harnessing magnetic relaxation: the “Pacman effect” allows precise organization of superparamagnetic beads

The orbital representation of a magnetic colloid dipole (left) resembles a Pac-Man shape (right). Credit: Biswal lab/Rice University Particles larger than ordinary molecules or atoms but invisible to the naked eye can form a variety of useful structures, including miniature propellers for microrobots, cell probes, and steerable microwheels designed for targeted drug delivery. Masu. When Lisa Biswal and her team…