Enhanced Flux Pinning Properties in Self-Assembled Magnetic $\hbox{CoFe}_{2}\hbox{O}_{4}$ Nanoparticles Doped $ \hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Thin Films
作者： Chen-Fong Tsai , Li Chen , Aiping Chen , F. Khatkhatay , Wenrui Zhang
DOI: 10.1109/TASC.2013.2238277
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摘要: In this work, self-assembled magnetic CoFe2O4 (CFO) nanoparticles are introduced into YBa2Cu3O7-δ (YBCO) thin films as both cap and buffer layers to enhance the flux pinning properties. CFO incorporated YBCO matrix by alternative laser ablation of targets employing pulsed deposition method, which is compatible with commercial processing method coated conductors. By introducing ferromagnetic nanoinclusions, defect can be achieve stronger effects under higher applied field regimes. Detailed microstructural studies conducted verify morphologies all doped samples. Both self-field in-field performance (Jcsf Jcin-field(H//c)) measured at various temperatures (65, 40, 5 K) studied. The results suggest that nanoparticle an ideal approach introduce ordered centers in films, shows enhanced superconducting properties high regimes without degrading YBCO's intrinsic
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