Assessment of Laser-Induced Damage in Laser-Micromachined Rare-Earth Permanent Magnets

Author

Peterson, Brock A. ; Herrault, Florian ; Oniku, Ololade D. ; Kaufman, Zachary A. ; Arnold, David P. ; Allen, Mark G.

Author_Institution

MicroSensors & MicroActuators Group, Georgia Inst. of Technol., Atlanta, GA, USA

Volume

48

Issue

11

fYear

2012

Firstpage

3606

Lastpage

3609

Abstract

The effects of micromachining bulk rare-earth magnets are investigated by measurements of the moment of sub-millimeter scale micromachined structures. A model representing these effects is also presented to provide a basis for interpreting the results. Laser-induced damage to the magnetic material, manifesting as a loss of magnetic properties, is estimated to reach 10-20 μm from the magnet edge in the lateral dimension. The results indicate the affected volume due to laser micromachining bulk rare-earth magnets is limited to less than 25 μm, laterally through the material, for the rare-earth magnetic materials tested.

Keywords

boron alloys; cobalt alloys; iron alloys; laser beam machining; magnetic moments; micromachining; neodymium alloys; permanent magnets; remanence; samarium alloys; NdFeB; SmCo; bulk rare-earth magnets; laser micromachining; laser-induced damage assessment; laser-micromachined rare-earth permanent magnets; lateral dimension; magnet edge; magnetic property loss; micromachining bulk rare-earth magnet effects; moment measurements; rare-earth magnetic materials; submillimeter scale micromachined structures; Laser beam cutting; Magnetic materials; Magnetic resonance imaging; Magnetization; Magnetometers; Superconducting magnets; Laser micromachining; NdFeB; SmCo; micromagnets; remanence;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2012.2196423

Filename

6332608