. The Bell System technical journal . -FIG. 2 PERMEABILITr CORVESFOR LOW MAGNETIZINGFORCES 5CO00 40000 30000 20000 10000 400 300 ZOO 100 .01 4RMC0 IRON MAGNETIZING FORCE M 02 400 300 ZOO 100 .03 -04 Fig. 2 .00 .06 .01 linearly with composition throughout the nickel-iron series, from 222for iron to 59 for The value 84 which we have found for per cent nickel alloy is therefore not abnormal. The magnetic characteristics of heat-treated ring samples of thesame alloy have also been determined through a wider range of field 4P. Weiss, Faraday Society Trans. 8, 149-156 (1912). PERMAL
. The Bell System technical journal . -FIG. 2 PERMEABILITr CORVESFOR LOW MAGNETIZINGFORCES 5CO00 40000 30000 20000 10000 400 300 ZOO 100 .01 4RMC0 IRON MAGNETIZING FORCE M 02 400 300 ZOO 100 .03 -04 Fig. 2 .00 .06 .01 linearly with composition throughout the nickel-iron series, from 222for iron to 59 for The value 84 which we have found for per cent nickel alloy is therefore not abnormal. The magnetic characteristics of heat-treated ring samples of thesame alloy have also been determined through a wider range of field 4P. Weiss, Faraday Society Trans. 8, 149-156 (1912). PERMALLOY, A NEW MAGNETIC MATERIAL 107 B 16000 ARMCO IROM ■c PERMALLOY 1 5000 MAGfCTIZAI ION CURVES 0 H 20 40 60 SO 100 Fig. 3 12000 AR *k;o iron FT eooo - ■ 1ALL0Y B / 4000 FIG 4-MAGNETIZATION CORVES H <j J j n b i 3 10 Fig. 4 108 BELL SYSTEM TECHNICAL JOURNAL 12 0OOr 6000 4000. Fig. 5 B /] ^_. PERMftLLO-i ARf 1CO RON / n .! i 1 a -— zooo 1 / ■ 3 •^AOOO FIG .6 . Fig. 6 PERMALLOY, A NEW MAGNETIC MATERIAL 109 strengths by ballistic methods. Figs. 3, 4, and 5 show B-H curves forsuch a sample of permalloy and for a sample of annealed armco Fig. 5 is apparent the enormous susceptibility of the formermaterial in the weak fields so important in communication engineer-ing. Fig. 6 shows for the same two materials hysteresis loops carriedto a maximum induction of 5000 maxwells. The area of the permalloyloop is only one sixteenth that of the loop for soft iron. Fig. 7 shows 100000 80 000 60000 40 000 20000
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