Magnetic properties of (Gd x Y 1−x )Co 2 B 2 compounds

Magnetic measurements were performed on the (GdxY1−x)Co2B2 compounds, in the temperature range 2–800 K and fields up to 70 kOe. YCo2B2 is a paramagnet. The (GdxY1−x)Co2B2 compounds with x≥0.2 shows a ferromagnetic type ordering. The saturation magnetization at 2 K coincides only with the contribution of gadolinium. The Curie temperatures are nearly linearly dependent on the composition. Above the Curie points, the thermal variations of the magnetic susceptibility can be described as a superposition of a temperature independent term ϰ0 on a Curie-Weiss behavior. The Curie constants are determined by the contribution of Gd3+ ions only. The ϰ0 values increase when the gadolinium content is greater. The observed properties are discussed in the wider framework of the magnetic behavior of cobalt in GdCoxBy compounds.