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We report the compositional and temperature dependence of magneticcompensation in amorphous GdFeCo films. Magnetic compensation is attributed tothe competition between antiferromagnetic coupling of rare-earth withtransition-metal (TM) ions and ferromagnetic interaction between the TM ions.The low-Gd region from 20 to 34 at. % was found to exhibit compensationphenomena characterized by a low saturation magnetization and perpendicularmagnetic anisotropy (PMA) near the compensation temperature. Compensationtemperature was not observed in previously unreported high-Gd region from 52 to59 at. %, in qualitative agreement with results from recent model calculations.However, low magnetization was achieved at room temperature, accompanied by alarge PMA with coercivity reaching ~6.6 kOe. The observed perpendicularmagnetic anisotropy of amorphous GdFeCo films probably has a structural originconsistent with certain aspects of the atomic-scale anisotropy. Our findingshave broadened the composition range of transition metal-rare earth alloys fordesigning PMA films, making it attractive for tunable magnetic anisotropy innanoscale devices.

Amorphous GdFeCo Films Exhibiting Large and Tunable Perpendicular Magnetic Anisotropy