Bulk permanent magnet with Fe/Ni multi-layered structure prepared by a pack rolling

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In this study, we tried to prepare a bulk permanent magnet with Fe and Ni multi-layered structure, which is one of good candidates for a rare earth-free magnet, by using a pack rolling. The combination of an induction heating and a pack rolling enabled us to obtain a 26 multi-layered Fe-Ni sheet with the thickness of approximately 30 microns under the rolling rate up to approximately 96 %. It, however, was difficult to increase the rolling rate and reduce the thickness of one layer because of the work hardening. In addition, further investigation was required to control the ordering and texture of the samples.