New soft magnetic alloys for applications in modern electrotechnics and electronics

New alloys for earth-leak transformers, pulse transformers, thyristor protecting chokes, and improved magnetic amplifiers are presented. It will be shown that fundamental developments in the range of materials are closely connected with the rise of new applications. The developments of materials concern Ni-Fe alloys with high initial and maximum permeability, with flat hysteresis loops and a low remanence, and with a rectangular loop. The physical background resulting in such loops will be explained and examples will be given for special dynamic characteristics.