A New Method to Obtain M-h Hysteresis Loops Using Torque Magnetometer

We have developed a new technique of using a torque rnagnetomet.er to obtain M·H hysteresis loop of a uniaxial magnetic materiaL The hysteresis curve was obtained from the loop of the torque r measured as a function of an applied field H, when the direction of the applied field q, was 9" from the uniaxial orientation. This technique was applied to obtain the hysteresis curves of several Co/Pd multilayer thin films. For a sample having a high anisotropy field, the present method was able to obtain its magnetization curve with a greater accuracy than a conventional VSM. This method, for example, has shown a high sensitivity of about 1 x 10-6 emu in measuring the magnetization curve of (2-A Co/9-A Pd)27.