Microlinear Halbach Array of Thick-Film Nd–Fe–B Magnets Utilizing Local Laser Irradiation and a Direction-Changeable External Magnetic Field

Abstract

The Halbach array magnetization of thick-film Nd–Fe–B magnets using local laser irradiation is examined. A 75 µm thick isotropic Nd–Fe–B magnet is deposited on a Si substrate by pulsed laser deposition and used to form microlinear Halbach arrays. The micromagnetization patterning of the Halbach arrays is realized by a combination of pulsed magnetization and laser-assisted heating with changing the external magnetic field direction. Halbach magnetic patterns with a pitch of 200 µm are obtained over a surface area of 1.7 mm width and 2.8 mm length. Their magnetic density over the top surface was measured by a scanning Hall probe. The vertical magnetic field value peak-to-peak at 100 µm from the magnet surface was 65 mT for the Halbach pattern, 2.7 times that of 24 mT for an alternating pattern.