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Ordered YBCO sub-micron array structures induced by pulsed femtosecond laser irradiation.

C W Luo1, C C Lee, C H Li

  • 1Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan, ROC. cwluo@mail.nctu.edu.tw

Optics Express
|December 10, 2008
PubMed
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Femtosecond laser pulses create organized sub-micron Yttrium Barium Copper Oxide (YBCO) dots on YBCO films. The dot morphology is controllable by adjusting laser fluence, yielding arrays with a critical temperature of 89.7 K.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Superconductivity

Background:

  • Yttrium Barium Copper Oxide (YBCO) is a high-temperature superconductor.
  • Controlling the morphology of thin films is crucial for device applications.

Purpose of the Study:

  • To investigate the formation of organized sub-micron YBCO dots using femtosecond laser irradiation.
  • To determine the influence of laser fluence on the morphology of YBCO films.

Main Methods:

  • YBCO films prepared by pulse laser deposition were irradiated with femtosecond laser pulses.
  • Laser fluences ranged from 0.21 to 0.53 J/cm(2).
  • Surface morphology was analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM).

Main Results:

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  • At a laser fluence of approximately 0.21 J/cm(2), periodic ripples with sub-micrometer spacing were observed.
  • Increasing the laser fluence to 0.26 J/cm(2) resulted in organized sub-micron dots (100-800 nm diameter, 150 nm height).
  • Higher fluences (over 0.32 J/cm(2)) led to massive melting and irregular morphology.

Conclusions:

  • Femtosecond laser irradiation offers a method for controlled fabrication of YBCO sub-micron dots.
  • The study demonstrates tunable morphology control of YBCO films by laser fluence.
  • Arrays of YBCO sub-micron dots with a critical temperature (Tc) of 89.7 K were successfully fabricated.