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

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6 Author(s)
Peterson, B.A. ; MicroSensors & MicroActuators Group, Georgia Inst. of Technol., Atlanta, GA, USA ; Herrault, F. ; Oniku, O.D. ; Kaufman, Z.A.
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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.

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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )