Structures and Superconducting Properties of Y-Ba-Cu-O Sputtered Films

Abstract

Y-Ba-Cu-O thin films were prepared by an RF magnetron sputtering technique. When annealed at temperatures between 920°C and 1000°C the crystal structures of these films are orthorhombic, while when annealed at 1010°C the structures are tetragonal. Superconductivity can be observed for the orthorhombic films. Their critical temperature (T c) of superconducting becomes higher as the a-axis becomes shorter, and is independent of the b-axis value.

Saturation magnetostriction of α″-Fe16N2 phase

“…The saturation magnetostriction of ␣ -Fe 16 N 2 phase is evaluated to be −19.1 × 10 −6 according to Eq. (2). It can be seen that the absolute value of the saturation magnetostriction of the ␣ -Fe 16 N 2 nanocrystallites is bigger than that of the ␣-Fe (Si) nanocrystallites (−4.5 × 10 −6 ) [19].…”

“…The magnetic properties of ␣ -Fe 16 N 2 phase have been attracting attention, since the first paper, where the preparation of a considerable amount of this phase by nitriding iron thin films was announced [1,2], reported unusually high value of magnetization ( = 3.0 B ) ascribed to this phase from the experimentally determined magnetic moment of a mixture containing several ironbased phases. There appeared a great number of papers dealing with the formation mechanism and the magnetic properties of ␣ -Fe 16 N 2 phase.…”

Annealing Effects of Iron Nitride Thin Film Grown by Plasma-Assisted Evaporation Technique

“…In 1988, by using the molecular beam epitaxy (MBE) technique, Komuro et al successfully synthesized singlecrystal Fe 16 N 2 lms with gi ant magnetic moment of 2.9 Wb/m 2 at room temperature. 2) Therefore, it was conrmed that Fe 16 N 2 has higher saturation magnetization than that of iron. Also, Nakajima et al formed Fe 16 N 2 in epitaxial iron lms by nitrogen implantation.…”

Nanocrystalline soft magnetic ribbon with α″-Fe16N2 nanocrystallites embedded in amorphous matrix

“…The a 00 -Fe 16 N 2 phase has been intensively studied for a long time because of its high saturation magnetization (2.83 T) [6,7].…”