Neodymium micro magnet is commonly founded in both injection molded magnets and compression molded magnets because of the binder is more flexible, but in fact, the material of micro magnet has been already expanded to ferrite magnets, sintered Neodymium magnets, sintered Samarium Cobalt magnets, and AlNiCo magnets. Neodymium micro magnet can be offered in micro disc magnets, micro block magnets, and micro ring magnets. Magnetic performance of sintered Neodymium magnets will be deteriorated after machining process, and this is largely due to the nucleation of magnetization reversal which occurred by surface oxidation and structural deformation. For Neodymium micro magnets, damaged area occupies the much larger proportion of the whole volume, then magnetic performance of Neodymium micro magnets decreases as the dimension declines. Sagawa found that coercivity of such Neodymium micro magnets restored after introduced heavy rare earth element (HRRE) Dy film to the surface and processed a heat treatment. This work is also considered as an illuminating thinking to subsequent grain boundary diffusion (GBD) magnets. Besides conventional metal coating like Nickel or Zinc, biocompatible Parylene coating is also suitable for Neodymium micro magnets. SDM has the capability to ensure tolerance in the range of +/-0.005mm to +/-0.020mm via advanced laser incising and drilling technology.
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