Temperature dependence of magnetization reversal in Ni80Fe20/Au/Co/Au multilayers

In this contribution we present the results concerning temperature changes of magnetic properties of [Ni80Fe20(2 nm)/Au(tAu)/Co(tCo)/Au(tAu)]10 multilayers (MLs) with tAu = 1.5, 2.2 nm and tCo = 0.6, 0.8 nm. Hysteresis loops of investigated MLs were measured using vibrating sample magnetometer in temperature range from 175 to 423 K. Saturation field HSCo of Co layers, determined from the loops taken with in-plane applied field, increases with decreasing temperature. The HSCo field is directly related to perpendicular magnetic anisotropy of Co layer. It was also found that a shape of a central part of the hysteresis loops, taken with magnetic field applied perpendicular to the sample plane, is characteristic for samples with large perpendicular anisotropy and stripe domain structure. The shape of hysteresis loops is preserved in the whole temperature range of measurements indicating a presence of stable stripe domains. The magnetization reversal of the Co layers can be described by nucleation HN, annihilation HA and coercive HC fields. Temperature dependence of above mentioned parameters is presented.