1J85 yog npib tsib xee-hlau hlau nplaum, muaj li ntawm 80% npib tsib xee thiab 20% hlau ntsiab lus.
1J79 yog npib tsib xee-hlau hlau nplaum, muaj li ntawm 80% npib tsib xee thiab 20% hlau ntsiab lus. Tsim nyob rau hauv 1914 los ntawm physicist Gustav Elmen ntawm Tswb Xov Tooj Laboratories, nws yog ib qho tseem ceeb rau nws cov magnetic permeability siab heev, uas ua rau nws muaj txiaj ntsig zoo li cov khoom siv hlau nplaum hauv cov khoom siv hluav taws xob thiab hluav taws xob, thiab tseem muaj cov hlau nplaum tiv thaiv los thaiv cov hlau nplaum.
1J50 yog npib tsib xee-hlau hlau nplaum, muaj li ntawm 50% npib tsib xee thiab 48% hlau ntsiab lus. Nws yog muab los ntawm permalloy. Nws muaj cov yam ntxwv ntawm siab permeability thiab siab saturation magnetic flux ceev.