Since the exchange coupling theory was proposed by Kneller and Hawig in 1991 there has been a significant effort within the magnetic materials community to enhance the performance of rare earth magnets by utilising nano-composite meta-materials. Inclusions of magnetically soft iron smaller than approximately 10 nm in diameter are exchange coupled to a surrounding magnetically hard Nd2Fe14B matrix and provide an enhanced saturisation magnetisation without reducing coercivity. For such a fine nanostructure to be produced, close control over the thermal history of the material is needed. A processing route which provides this is laser annealing from an amorphous alloy precursor. In the current work, relationships between laser parameters, thermal histories of laser processed amorphous stoichiometric NdFeB ribbons and the magnetic properties of the resulting nanocrystalline products have been determined with a view to applying the process to thick film nanocomposite magnet production.
Fiber laser processing of amorphous rare earth NeFeB magnetic materials
David Hopkinson, Andrew Cockburn, William O’Neill; November 27–30, 1990. "Fiber laser processing of amorphous rare earth NeFeB magnetic materials." Proceedings of the International Laser Safety Conference. ICALEO® 2011: 30th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Cincinnati, Ohio, USA. (pp. pp. 1233-1240). ASME. https://doi.org/10.2351/1.5062208
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