Abstract
Magnetic measurements were performed on Ferromagnetic/Antiferromagnetic (F/AF) Ca-doped manganite bilayers in order to elucidate the interface contribution to the total magnetic moment. A 10-nm-thick La2/3Ca1/3MnO3 (F) film was used as a ferromagnetic layer and a 60-nm-thick La1/3Ca2/3MnO3 (AF) film as an Antiferromagnetic. The low thickness ratio (1/6) allowed us to enhance the magnetic moment effects due to the AF layer. The temperature dependence of the saturation magnetic moment (MS) was studied. MS was extracted from isothermal magnetic hysteresis loops from room temperature down to 10 K. By using the Heisenberg model frame for the saturation magnetization change, a τ5/2 term was found to better describe the experimental data, meaning long-wavelength spin waves dominate the temperature behaviour. By applying a field cooling field (FC), a significant exchange bias field (Hex) was found (around 20 Oe at 10 K). The Hex temperature dependence follows an exponential decay similar to that observed in the F/AF superlattice case.
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