FE-SEM observation of chains of nanohillocks in SrTiO and Nb-doped SrTiO surfaces irradiated with swift heavy ions

Kitamura, Akane; Ishikawa, Norito   ; Kondo, Keietsu  ; Yamamoto, Shunya*; Yamaki, Tetsuya*

Irradiation at grazing incidence formed chains of multiple hillocks on the surface of strontium titanate (SrTiO) and titanium oxide (TiO). They were observed with an atomic force microscope (AFM), however, the AFM measurement gives resolution errors in a nanometer order due to the curvature of the probe tip. To prevent these errors, a field emission scanning electron microscope (FE-SEM) would be a better option for observation. In this study, we performed SEM observations for the chains of the multiple hillocks. Single crystals of SrTiO and TiO were irradiated with 200 MeV Xe in the tandem accelerator at JAEA-Tokai. It was revealed that a lot of isolated hillocks were formed in a line on these surface. The diameter and the interval of those hillocks are discussed in comparison to AFM observation.