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... -magnetic materials (such as Permendur) are weakly anisotropic but highly magnetostrictive.Soft-magnetic materials are subdivided into two groups according to their function: materials for weak-current equipment and for electrical steel. Binary and other Fe-Ni alloys (Permalloys), which have low H c (≈ 0.01 oersted) and very high μ a (up to 10 5) and μ max (up to ...