Control of magnetic flux in a YBa2Cu3O7−δ thin film loop using femtosecond laser pulses

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  • Masayoshi Tonouchi
    Research Center for Superconducting Materials and Electronics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565, Japan
  • Noboru Wada
    Research Center for Superconducting Materials and Electronics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565, Japan
  • Masanori Hangyo
    Research Center for Superconducting Materials and Electronics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565, Japan
  • Masahiko Tani
    Kansai Advanced Research Center, Communications Research Laboratory, 588-2 Iwaoka, Nishi-ku, Kobe 651-24, Japan
  • Kiyomi Sakai
    Kansai Advanced Research Center, Communications Research Laboratory, 588-2 Iwaoka, Nishi-ku, Kobe 651-24, Japan

Abstract

<jats:p>A superconducting optical flux-trap memory with a femtosecond pulsed laser is proposed and then demonstrated. The magnetic flux is trapped in a simple YBa2Cu3O7−δ thin film loop with a polarity controlled by means of optical supercurrent modulation. After removing the external bias current, the trapped fluxes are detected by observing electromagnetic pulse radiation 60 cm away from the sample, which is excited by modulating a persistent current that circulates in the loop. The mechanism for the readin of the magnetic fluxes is discussed in relation to the current distribution in the memory.</jats:p>

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