The axial permanent magnet is composed of a special-shaped neodymium iron boron magnetic block array. The central axis of the magnetic field has a through hole, the magnetic field strength is high, and the volume is small, which is suitable for optical experiments and calibration of axial probes.

Dimensions Φ60*50mm Inner diameter Φ20mm Weight 1 (Kg) 12 sector-shaped magnetic blocks, each with a different magnetization direction, arranged in a Halbch circular array; The central magnetic field strength is 1.04 (T); The uniformity in the range of Φ6*6mm in the center of the magnetic field is 0.5% in the axial direction and 0.5% in the radial direction.

The permanent magnet can be made into a rotating magnetic field in the form of mechanical rotation. When the permanent magnet rotates mechanically around the center of action of the magnetic field, the direction of the magnetic field is fixed in space to obtain a sine wave magnetic field. The alternating frequency of the magnetic field polarity is adjustable from 0-7Hz, the magnetic field space is large, and the magnetic field intensity can be customized.