Temperature dependence of magnetic properties and magnetic-field behavior of three-layer thin-film Co/Gd/Co systems

The results of the investigation of the dependence of the magnetic properties and magnetic- field behavior of thin-film three-layer Co/Gd/Co systems on temperature in the range from 100 to 300 K are presented. The samples were obtained by ion-plasma magnetron sputtering. The thickness of the Co layers is 5.0 nm, and Gd layers, tGd, varied from 3.0 to 9.0 nm. The volume magnetic characteristics were studied using a vibrating sample magnetometer with the field oriented parallel to the plane of the samples. It is found the temperature influence on the magnetic characteristics and magnetic field behavior of the samples. In particular, the shape of the hysteresis loops depends on the thickness of the Gd layer and the temperature. The dependences of the magnetic moment and coercive force on temperature are found. As the temperature changes from 100 to 300 K, an increase in the values of the magnetic moment of the samples is observed, as well as a decrease with an increase in tGd. It is discovered that the values of the coercive force decrease with an increase in temperature from 100 to 300 K. It is found that the magnetic compensation point for a sample with tGd = 9 nm is T = 150 K.