気相急冷 Fe-Al 合金の非平衡相の磁性

Fe-Al alloy films have been obtained by rf sputtering technique and have been investi. gated by means of X-ray diffraction, magnetization and Mossbauer effect measurements A well disordered bcc phase is extended up to about 70at % Al, an amorphous phase between 75 and 85at % Al and an fcc phase from 90 to 100at % Al. The disordered bcc alloys are ferromagnetic at low temperatures and show a perpendicular magnetic anisotropy at 290 K for about 38 at % Al. The amorphous and fcc alloys are paramagnetic even at 4.2 K.