Pulsed-laser deposition of oxides : High -TC superconductors and piezoelectrics
2008
Pulsed-laser deposition (PLD) is an excellent technique to grow thin films and multi-layers of complex oxide materials.
We present our recent results on deposition, characterization and nano-patterning of novel oxide high-temperature
superconductors (HTS) and piezoelectric materials. HTS thin films of improved superconducting properties are
fabricated from ceramic targets consisting of Y 2 Ba 4 CuMO y (M = metal) nano-particles embedded in YBa 2 Cu 3 O 7
(YBCO) matrix. The nano-composite ceramics are UV-laser ablated and the optical plasma emission is monitored by
laser - induced breakdown spectroscopy. The HTS films reveal superconducting critical current densities that depend on
target composition and are strongly enhanced as compared to phase pure YBCO films. Application of HTS layers in
future nano-electronic devices requires novel techniques for nano-patterning. Masked ion-beam structuring enables the
nano-patterning of YBCO thin films in a direct and single-step process. Gallium orthophosphate (GaPO 4 ) thin films and
piezoelectric ZnO multi-layers are reported also. GaPO 4 is an outstanding piezoelectric material with very high
transition temperature (~ 970 °C). Epitaxial GaPO 4 films are fabricated on quartz substrates by PLD and thermal post-annealing.
Long-term annealing at high temperature does not degrade the GaPO 4 films. Multi-layers of Al and Li doped
ZnO are pulsed-laser deposited on various substrates and investigated for applications in thin film sensors.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
8
References
1
Citations
NaN
KQI