Vortex behavior in the finite-sized square network of Pb

✍ Scribed by Hiroshi Noda; Hirokazu Yoshikawa; Osamu Sato; Masaru Kato; Kazuo Satoh; Tsutomu Yotsuya; Takekazu Ishida

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 384 KB
• Volume: 426-431
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2005.02.025

✦ Synopsis

Vortex behavior of superconducting finite-sized networks with 2 • 2 and 10 • 10 hole arrays has been investigated in a weak magnetic field. Photoresist films spin-coated on silicon substrates were first processed to draw network patterns by using the electron beam lithography. Then, the Pb networks have been made up by a lift-off technique after depositing Pb film on the resist patterns. The thickness of deposited Pb films is 200-250 nm. Photoresist film was coated to protect Pb networks fabricated on silicon substrates (4 • 4 mm). We carried out magnetization measurements of the Pb networks by a SQUID magnetometer as well as vortex image observations by a SQUID microscope. Matching peaks appeared in magnetization curve when a magnetic field was scanned from À4.7 G to +4.7 G. The magnetic field in SQUID microscope measurements was chosen as the integral multiples of the matching field H / , where the scanning area typically covers 128 • 128 lm with 1-or 2-lm step.