Rotational hysteresis energy in Co/Tb multilayers

Transition metal/rare-earth multilayers show some unusual magnetic properties and are potential candidates as magneto-optical recording media. In this paper, we study by means of a torque magnetometer, the magnetic behavior of [Cox Å/Tb15 Å]10 multilayers prepared by molecular beam epitaxy. We are interested here in the rotational hysteresis energy as a function of both the temperature and the Co thickness.