. The Bell System technical journal . ) ^ r-H CS ^ 19,00011,600 Maxi-mumPerme-ability Mm ooooooo ooooooo lO t-~ O O 0__iO 00 lo o f5 lo tN >* --T CN O 1^ O <50 InitialPerme-ability O O O O O O ID lO o o o o o o CN -* r-_^O__O__00 rn O t-~ •<:f< r<u-- 2 E £ 900 Anneal 800 Anneal 1100 Anneal 1000 + Air Quench, 1000 Anneal 800 Anneal 1000 + 425 Bake 840 Quench 940 Quench Quench + 600 Bake Quench + 700 Bake 950 Vacuum Soft Magnetic Materials Magnetic Iron 4 Per Cent Silicon Iron 45 Permalloy (Ni, Fe) Permalloy (Ni, Fe) 4-79 Mo-Permalloy (Mo, Ni, Fe) 2 V Permendur (V, Co, Fe) 45
. The Bell System technical journal . ) ^ r-H CS ^ 19,00011,600 Maxi-mumPerme-ability Mm ooooooo ooooooo lO t-~ O O 0__iO 00 lo o f5 lo tN >* --T CN O 1^ O <50 InitialPerme-ability O O O O O O ID lO o o o o o o CN -* r-_^O__O__00 rn O t-~ •<:f< r<u-- 2 E £ 900 Anneal 800 Anneal 1100 Anneal 1000 + Air Quench, 1000 Anneal 800 Anneal 1000 + 425 Bake 840 Quench 940 Quench Quench + 600 Bake Quench + 700 Bake 950 Vacuum Soft Magnetic Materials Magnetic Iron 4 Per Cent Silicon Iron 45 Permalloy (Ni, Fe) Permalloy (Ni, Fe) 4-79 Mo-Permalloy (Mo, Ni, Fe) 2 V Permendur (V, Co, Fe) 45-25 Perminvar (Co, Ni, Fe) Magnet Steels 3 Per Cent ChromeHonda (C, W, Co, Fe)Mishima (Al, Ni, Fe)Remalloy (Mo, Co, Fe)Oxide (Fe, Co, O2) 1-1 o; a; n »H Csl <V5 -^ »0 so t^ 00 0\ 0 -H CN MAGNETIC MATERIALS IN TELEPHONE SYSTEM 44J. FUUX DENSITY IN GAUSSES (B) 444 BELL SYSTEM TECHNICAL JOURNAL The saturation flux density for the soft magnetic materials can be readfrom these curves, and it is Hsted in the adjacent Table III in thecolumn headed 47r/oo. The pre-eminence of 2 \^-permendur is note-worthy. Further important magnetic properties are obtained from thehysteresis loop. This gives the B, II relationship for a material whichhas already been magnetized up to a peak value //,„. The flux densityremaining after the removal of a very large magnetizing force is theresidual By, and the reverse magnetizing force necessary to bring theflux to zero is the coercive force He. The area of the B, H loopwhen the peak magnetizing force is very large gives the maximumenergy W^ dissipated by hysteresis in the material when it is carriedfrom positive magnetic saturation to negative, and back again. TableIII gives values of W^, Br and //«. The low values of these propertiesfor 4—79 Mo-permalloy are noteworthy. Among soft ma
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
