Development of ferromagnetic insulator EuO thin films for the insulator barrier of high-T{sub}c Josephson junction

摘要

We intend to develop a high-T{sub}C superconductor (HTSC)-T{sub}C/ferromagnetic insulator EuO/HTSC Josephson junction. Ferromagnetic Curie temperature of BuO is 69 K. It is expected that the effect of ferromagnetism on junction characteristic is investigated as considering the transition from paramagnetism to ferromagnetism of barrier layer below T{sub}C. As a first step to develop such a junction, we grow EuO film on MgO substrate, which has same structure as EuO, and on SrTiO{sub}3 substrate, which structure is a base of HTSC layered structure. EuO films epitaxially grew directly on MgO substrate, and on SrTiO{sub}3 substrate with BaO butler layer. Such films had magnetic properties same as bulk.