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FLUX PINNING IN MgB2 THIN FILMS GROWN BY PULSED LASER DEPOSITION

M. Ionescu1,* , Y. Zhao1, M. Roussel1, S. X. Dou1, R. Ramer2, M. Tomsic3

Affiliation

  1. Institute for Superconducting & Electronic Materials, University of Wollongong, NSW 2522 Australia
  2. School of Electrical Engineering and Telecommunications, University of South Wales, Sydney 2052, Australia
  3. Hypertech Research Inc. OH, USA

Abstract

A number of c-axis oriented MgB2 thin films were grown in-situ by pulsed laser deposition (PLD) on Al2O3-R cut, and the pinning properties were investigated using transport, DC magnetisation and magneto-optical imaging (MOI) techniques. It was found that at temperatures below 10K and large applied DC magnetic fields, the irreversibility line of in situ MgB2 thin films is higher that a bulk material. The critical current density Jc of in-situ thin films is less dependent on the applied magnetic field B than the current density Jc of an ex-situ MgB2 film or bulk. The penetration of magnetic field inside the film is uniform, and it follows the theoretical prediction for a homogenous thin film..

Keywords

MgB2, Thin films, Pulsed laser deposition, Superconductor, Flux pinning.

Submitted at: Oct. 14, 2003
Accepted at: March 15, 2004

Citation

M. Ionescu, Y. Zhao, M. Roussel, S. X. Dou, R. Ramer, M. Tomsic, FLUX PINNING IN MgB2 THIN FILMS GROWN BY PULSED LASER DEPOSITION, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 1, pp. 169-176 (2004)