Abstract: A device for producing pulsating magnetic fields comprises a substrate rotatable about an axis and having disposed thereon at least one pair of magnets with a direction of magnetization substantially parallel to the rotational axis such that rotation of the substrate by 180.degree. about its rotational axis transfers the pole faces of the magnets into each other and that there exists no symmetry of the pole faces relative to a plane which includes the rotational axis. The orientation of the pole faces of the magnets is such that during rotation of the substrate, magnetic forces are exerted radially with respect to the axis about which the substrate is rotated by drive structure provided for that purpose. In accordance with various embodiments, the magnets may be disposed upon one or both sides of the substrate and may be of rectangular, arcuate, wedge-like or other plate-like configurations.