A photo from open sources
Researchers from the University of Kanagawa (Japan) found promising field of practical application of diamagnetic levitation used now mainly in entertainment purposes.
For the first time, a group of scientists managed to control a levitated object, without touching it and without changing the parameters of the magnetic field – see video. In the experimental setup, a graphite disk with a diameter of 3 mm hovering over an array of permanent magnets of neodymium-iron-boron composition. Their poles are staggered. Laser irradiation the edge of the disk there is a temperature difference (about 20 degrees per give me a sec). As a result, the disk almost immediately shifts to beam direction. The height of the gap between the disk and the magnetic substrate can be regulated both due to the strength of the magnetic field, and by selecting material with the required magnetic susceptibility. According to the combination of properties, the most suitable Pyrolytic graphite and its highly oriented form are considered. If you put a graphite disk on a stack of neodymium magnets, then irradiation of its edge will cause rotation around the axis. For clarity the disk is segmented like a tablet. Based on observed of effect is predicted the creation of new energy conversion systems (focused) light into mechanical and electrical. At using instead of a laser of sunlight, researchers expect to reach speeds of more than 200 rpm. Because the the disk practically does not experience friction, energy losses should be extremely small.
Lasers Japan
