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Nanoscale surface properties of iron treated by electrochemical and physico-chemical methods
H. Nanjo,M. Fujimura,N.J. Laycock,Z. Xia,M. Nishioka,I. Ishikawa,J. Onagawa 한국물리학회 2006 Current Applied Physics Vol.6 No.3
The nanoscale surface structure of surface oxide lms formed on pure iron treated by UV irradiation at 3 mW/cm2 and electrochem-microscopy and spectroscopic ellipsometry. UV irradiation of the air-formed lm decreased the lm thickness, surface roughness andsurface area. UV irradiation of electrochemically passivated surfaces increased the lm thickness and the terrace width of the oxide film.
Effects of La Substitution for BiFeO<sub>3</sub> Epitaxial Thin Films
K. Wakazono,Y. Kawahara,K. Ujimoto,T. Yoshimura,N. Fujimura 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
The relationship between the Curie temperature and the piezoelectric properties for BiFeO<sub>3</sub> epitaxial thin films was investigated by using A-site substitution of La. BiFeO<sub>3</sub> and (Bi<sub>0.9</sub>La<sub>0.1</sub>)FeO<sub>3</sub> epitaxial thin films were deposited by using pulsed laser deposition. The crystallinities, ferroelectric domain structures and piezoelectric properties for the films were investigated. Although the crystallinity was improved by La substitution, the piezoelectric properties decreased. We suggest that La substitution for BiFeO<sub>3</sub> epitaxial thin films enlarges the domain size and decreases the 71˚ domain wall, which reduce the intrinsic contribution to the piezoelectric properties.
T. Matsui,E. Taketani,H. Tanaka,K. Morii,N. Fujimura,T. Ito 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
We have succeeded in preparing single crystalline lms of BaFeO3, which may contain unusual Fe4+ ions, on (100) SrTiO3 substrates by pulsed laser beam deposition. The RHEED patterns for the lms on the (100) substrates apparently show a C4 symmetry, suggesting that the sample had a pseudo-cubic perovskite structure rather than hexagonal unit cell. The (100) epitaxially grown lms were found to be highly insulating, up to the leakage current density lower than 1 A/cm2 at the bias voltage of ..1:5 V. In addition, the lms showed a high value of dielectric constant of " = 59, and relatively small dissipation factor of about 0.07 at 100 kHz. The samples were also revealed to have a remanent magnetization at 300 K.