Abstract
Hot-pressed Nd-Fe-B, epoxy-bonded Nd-Fe-Co-B, and BaO-6Fe 2O 3 (ferrite) permanent magnets are heated by scanning their surfaces with an argon ion laser beam. The laser heating response of each magnet material is examined by measuring the depth of the heat-affected zone as a function of beam power and scan rate. An analytic heat transfer model is used to provide a convenient description of the laser surface heating process. The temperature distribution in the magnets is calculated to estimate the depth of the heat-affected zone as defined by the position of the Curie temperature isotherm. Agreement is good among the calculated and measured depths for all three permanent magnet materials.
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