MAGNETIC-ANOMALIES IN EUO NONMAGNETIC INSULATOR MULTILAYERED FILMS/

Ferromagnetic EuO multilayered films (MLs) were fabricated with nonmag netic oxides such as MgO, ZrO2, and Y2O3. The EuO MLs showed increased Curie temperature (T-c) and metal insulator transition temperature (T -mi) than the bulk values due to oxygen deficiency. However, (EU)-E-15 1 Mossbauer spectra did not exhibit such an anomaly in T-c. It suggest s a field induced magnetic component in the MLs. Significant increase of coercive force (H-c) with decreasing EuO layer thickness was observ ed only in EuO/MgO MLs. It was suggested that this increase was origin ated from a kind of interface effect. (C) 1997 American Institute of P hysics.