Abstract
Magnetism of 3d transition metal is closely related to the crystal structure via the band structure. From the viewpoint that the quasi-equilibrium crystal phase could possess the unique magnetism different from that of thermo-mechanically equilibrium phase, we have been investigating the creation of quasi-equilibrium crystal phase using epitaxial growth and its magnetism. In this report, we present the structure, magnetism and these correlation of ultrathin Co film grown on SrTiO_3(001) substrate which is expected to form the bcc type Co. It is found that the newly formed steps are observed on Co surface in the direction of 26° from SrTiO_3[001]. Furthermore, Co shows the uniaxial magnetic anisotropy parallel the newly observed step direction. In addition to the above correlation, from the discussions on the epitaxial growth of Co on SrTiO_3(001), it is considered that our Co film forms hcp(112^^-0) on SrTiO_3(001) surface.
