Presentation Information
[15p-PB1-41]Development of a Permanent-Magnet-Based Magnetic Levitation System Generating
〇Hikaru Goto1, Yasuhiro Ikezoe1 (1.NIT)
Keywords:
diamagnetic magnetic levitation,permanent magnets
Diamagnetic levitation is realized when the repulsive force exerted by a magnet on a diamagnetic material balances gravity.
A key feature of diamagnetic levitation is that a levitated object can be stably held at rest under mild, room-temperature conditions, making this technique promising for applications in materials science, crystal growth, and related experimental studies. However, because the magnetic susceptibility of diamagnetic materials is extremely small, the magnetic repulsive force acting on the levitated object is also very weak. Consequently, it has generally been believed that diamagnetic levitation requires extremely strong magnetic fields on the order of 20 T, typically generated by powerful magnets such as hybrid magnets.
In recent years, however, we have succeeded in stably levitating liquids and solids within a narrow gap by precisely calculating the magnetic field distribution formed in a long, valley-shaped gap along the edge created when rectangular permanent magnets are brought into contact [1]. During the development of this technique, we also found that the magnetic force increases as the radius of curvature of the magnet edge decreases. In the present study, we report the development of a magnetic levitation device using custom-made permanent magnets with an edge curvature radius of 0.1 mm. This device is expected to greatly expand the versatility and future potential of magnetic levitation experiments.
[1] T. Naito, et al., Appl. Phys. Lett. 125, 264102 (2024)
A key feature of diamagnetic levitation is that a levitated object can be stably held at rest under mild, room-temperature conditions, making this technique promising for applications in materials science, crystal growth, and related experimental studies. However, because the magnetic susceptibility of diamagnetic materials is extremely small, the magnetic repulsive force acting on the levitated object is also very weak. Consequently, it has generally been believed that diamagnetic levitation requires extremely strong magnetic fields on the order of 20 T, typically generated by powerful magnets such as hybrid magnets.
In recent years, however, we have succeeded in stably levitating liquids and solids within a narrow gap by precisely calculating the magnetic field distribution formed in a long, valley-shaped gap along the edge created when rectangular permanent magnets are brought into contact [1]. During the development of this technique, we also found that the magnetic force increases as the radius of curvature of the magnet edge decreases. In the present study, we report the development of a magnetic levitation device using custom-made permanent magnets with an edge curvature radius of 0.1 mm. This device is expected to greatly expand the versatility and future potential of magnetic levitation experiments.
[1] T. Naito, et al., Appl. Phys. Lett. 125, 264102 (2024)