Exchange Bias and Coercivity in Vicinity of Magnetic Compensation Point in GdFeCo Amorphous Film

Magnetic properties of amorphous GdFeCo film are studied in the temperature range from 5 to 300 K.The temperature dependence of the magnetization shows that the GdFeCo film has different compensation temperature for cooling and heating processes.Perpendicular magnetic anisotropy is observed in the GdFeCo film and persists in the whole measuring temperature range.Coercivity increases rapidly as the temperature approaches the compensation point and displays M-type variation.The hysteresis loop shows a small exchange bias at room temperature.The exchange bias is observed to increase significantly when temperature is close to the compensation point and shows multiple peak variation.Two magnetic phases are suggested to be coexisting in the sample.Bases on this assumption, the peculiar magnetic properties of the amorphous GdFeCo film can be well explained.