The room-temperature magnetization of the Fe_3O_4 films is 296 emu/cm3 under 50 kOe magnetic fields, which is much lower than that of the bulk value (471 emu/cm3) and was not saturated in such a high magnetic field.

• 室温下多晶Fe_3O_4薄膜在50 kOe的磁场下磁化强度为296 emu/cm3,远远小于块体材料的饱和磁化强度值(471 emu/cm3),而且没有达到饱和。 低温下,带场冷却的磁滞回线有交换偏置现象,但当温度升高到200 K左右时交换偏置消失。