High performance DC superconducting quantum interference device utilizing a bicrystal junction with a 30° misorientation angle

Tadashi Minotani, Satoru Kawakami, Takanobu Kiss, Yukinori Kuroki, Keiji Enpuku

Research output: Contribution to journalArticle

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Abstract

A high Tc dc superconducting quantum interference device (SQUID) was fabricated using a bicrystal junction with a misorientation angle of θ = 30°. The junction with a width of 2 μm exhibited high resistance Rs = 10Ω and critical current I0 = 25 μA at T = 77 K. This gives a I0Rs as high as 250 μV. These values indicate that the bicrystal junction has great potential for the development of high performance SQUIDs. The SQUID fabricated with a 30° junction exhibited voltage modulation depths as high as ΔV = 85 μV, 40 μV and 20 μV at T = 77 K for the inductance values of Ls = 60 pH, 100 pH and 160 pH, respectively. These are the highest values reported so far. Preliminary noise measurement showed that the flux noise of the SQUID is less than 8 μΦ0/Hz1/2 for the white noise region, and less than 70 μΦ0/Hz1/2 at f = 1 Hz when the 60 pH-SQUID is dc biased and operated with a conventional Flux Locked Loop (FLL) circuit.

Original languageEnglish
Pages (from-to)L1092-L1095
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume36
Issue number8 SUPPL. B
Publication statusPublished - Aug 15 1997

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Bicrystals
bicrystals
SQUIDs
misalignment
direct current
interference
Fluxes
high resistance
noise measurement
white noise
inductance
Critical currents
White noise
critical current
Inductance
modulation
Modulation
electric potential
Networks (circuits)
Electric potential

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

High performance DC superconducting quantum interference device utilizing a bicrystal junction with a 30° misorientation angle. / Minotani, Tadashi; Kawakami, Satoru; Kiss, Takanobu; Kuroki, Yukinori; Enpuku, Keiji.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 36, No. 8 SUPPL. B, 15.08.1997, p. L1092-L1095.

Research output: Contribution to journalArticle

Minotani, Tadashi ; Kawakami, Satoru ; Kiss, Takanobu ; Kuroki, Yukinori ; Enpuku, Keiji. / High performance DC superconducting quantum interference device utilizing a bicrystal junction with a 30° misorientation angle. In: Japanese Journal of Applied Physics, Part 2: Letters. 1997 ; Vol. 36, No. 8 SUPPL. B. pp. L1092-L1095.
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