PROJECT TITLE :

Sub-Millimeter Pitch Multipole Magnetization in a Sintered Nd-Fe-B Magnet Utilizing Laser Heating

ABSTRACT:

Sub-millimeter pitch, multipole magnetization is obtained in an exceedingly sub-millimeter-thick, sintered, Nd-Fe-B magnet. Regions of a perpendicularly magnetized half are heated by a scanned laser beam. The heated regions with lower coercivity are reverse-magnetized by the leakage flux from adjacent unheated areas. A high side ratio of magnetized width to thickness is achieved by the use of heat insulating slits. The slit depth and laser scanning conditions were determined by simulating the temperature distribution in the magnet. A 500 μm thick multipole magnet with a 650 μm pitch had a vertical magnetic field of zero.forty eight T (p-p) at a distance of 100 μm from the surface, in shut agreement with the simulation.


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