• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.04a
• /
• pp.125.2-125.2
• /
• 2000

• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.04a
• /
• pp.85.2-85.2
• /
• 2000

• Proceedings of the Korean Ceranic Society Conference
• /
• 2004.04b
• /
• pp.31.4-31.4
• /
• 2004

• Journal of the Korean Ceramic Society
• /
• v.36 no.11
• /
• pp.1183-1188
• /
• 1999

• Proceedings of the Korean Magnestics Society Conference
• /
• 2000.05a
• /
• pp.122-123
• /
• 2000

• 한국전기화학회:학술대회논문집
• /
• 2004.10a
• /
• pp.33-33
• /
• 2004

• Proceedings of the Korean Vacuum Society Conference
• /
• 2004.02a
• /
• pp.73-73
• /
• 2004

• Proceedings of the Korean Magnestics Society Conference
• /
• 2000.09a
• /
• pp.457-458
• /
• 2000

• Progress in Superconductivity and Cryogenics
• /
• v.24 no.2
• /
• pp.19-22
• /
• 2022

We studied the effect of substrate-induced strain state on the superconducting transition in GdBa₂Cu₃O_7-x(GdBCO)/La_0.7Sr_0.3MnO₃ (LSMO) bilayers deposited on a LaAlO₃ (LAO) substrate. The stain state of LSMO is controlled by increasing the thickness from 20 nm to 80 nm. Analyses on the extended X-ray absorption fine structure (EXAFS) measurements reveal difference in the direction of MnO₆ octahedral distortion depending on the LSMO thickness, which leads to a difference in anisotropy of magnetization of LSMO layer. The superconducting transitions of our system are strongly correlated with the magnetic anisotropy accompanied by the MnO₆ octahedron distortion in a specific direction. This result suggests the possibility of improving the superconducting transition in the GdBCO/LSMO bilayer system by controlling the degree of competition between superconductivity and ferromagnetism via adjusting strain state in the LSMO layer.

• Korean Journal of Materials Research
• /
• v.21 no.9
• /
• pp.482-485
• /
• 2011

$La_{0.6}Sr_{0.4}MnO_3$ (LSMO) thin films, which are known as colossal magnetoresistance materials, were prepared on fused silica thin films by conventional RF magnetron sputtering, and the interfacial reactions between them were investigated by rapid thermal processing. Various analyses, namely, X-ray diffraction, transmission electron microscopy combined with energy adispersive X-ray spectrometry, and secondary ion mass spectrometry, were performed to explain the mechanism of the interfacial reactions. In the case of an LSMO film annealed at $800^{\circ}C$, the layer distinction against the underplayed $SiO_2$ was well preserved. However, when the annealing temperature was raised to $900^{\circ}C$, interdiffusion and interreaction occurred. Most of the $SiO_2$ and part of the LSMO became amorphous silicate that incorporated La, Sr, and Mn and contained a lot of bubbles. When the annealing temperature was raised to $950^{\circ}C$, the whole stack became an amorphous silicate layer with expanded bubbles. The thermal instability of LSMO on fused silica should be an important consideration when LSMO is integrated into Si-based solid-state devices.