Development of Linear-Drive Type Modulated Rotating Magnetic Field Equipment

Abstract

Powders of functional materials with tri-axial magnetic anisotropy can be bi-axially aligned under modulated rotating magnetic fields (MRFs) in principle. Magnetic alignment is a material production process without highly oriented templates and a room temperature process. However, in the case of MRF, rotation of magnetic field is required for the generation of MRF, which looks inappropriate for continuous production process along a linear direction with linear motion apparently. In this article, development and details about the equipment of linear drive type MRF generation system are described. First topic is principle of MRF and design of permanent magnet array for generate of MRF. Second topic is the bi-axial magnetic alignment of practical rare-earth-based cuprate superconductors using the equipment. Final topic is the current status on design of the magnet arrays to generate higher magnetic flux densities.