Researchers have developed sperm-inspired microrobots which can be controlled by oscillating weak magnetic fields. The 322 micron-long robots consist solely of a head coated in a thick cobalt-nickel layer and an uncoated tail. Researhers have said that this type of robots can help in many avenues such as targeted drug delivery in vitro fertilization cell sorting and cleaning of clogged arteries among others. When the robot is subjected to an oscillating field of less than five millitesla - about the strength of a decorative refrigerator magnet - it experiences a magnetic torque on its head which causes its flagellum to
