Temperature Study of the Antiferromagnetic Coupling at the Interface of La $_{0.7}$ Sr $_{0.3}$ MnO

We have studied the antiferromagnetic coupling at the interface of the La_0.7 Sr _0.3MnO₃/SrRuO₃ bilayer as function of temperature. We measured the La_0.7 Sr _0.3MnO₃ magnetization reversal while the SrRuO ₃ magnetization is blocked due to a field cooled procedure and because of its high coercive field. Even if in this system, the La _0.7Sr_0.3MnO₃ magnetization cycle may be explained by two exchange couplings which coexist up to 120 K, the exchange bias and the coercive field from 5 K to 300 K have a similar behavior from some ferromagnetic/antiferromagnetic systems.