Fabrication and properties of high- Tc YBCO josephson junction and SQUID with variable thickness bridges by focused ion beam

Chiu Hsien Wu; Fong Jyun Jhan; Jau Han Chen; Jen Tzong Jeng; Kuen Lin Chen; Hong Chang Yang

doi:10.1109/TASC.2010.2100352

Fabrication and properties of high- T_c YBCO josephson junction and SQUID with variable thickness bridges by focused ion beam

Chiu Hsien Wu^*
, Fong Jyun Jhan
, Jau Han Chen
, Jen Tzong Jeng
, Kuen Lin Chen
, Hong Chang Yang

^*Corresponding author for this work

Institute and Undergraduate Program of Electro-Optical Engineering

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

We have successfully fabricated YBCO Josephson junctions and SQUIDs with variable thickness bridges. The variable-thickness bridges of YBCO thin film were fabricated by photolithography and Focused ion beam mill. The Josephson effects of variable thickness bridges were obtained in a 80 nm-thick-film of high- T_c YBa₂Cu₃O_y The Shapiro steps were observed in single junction in the gigahertz range from 3.02 to 14.64 GHz. The voltage-current and voltage-field characteristics were measured in SQUID magnetometer. The SQUID shows a peak-to-peak voltage swing of 1.5 μV at 70 K. The properties of one junction and SQUID magnetometer have been investigated.

Original language	English
Article number	5699961
Pages (from-to)	375-378
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	21
Issue number	3 PART 1
DOIs	https://doi.org/10.1109/TASC.2010.2100352
Publication status	Published - 2011 Jun

Keywords

Focused ion beam
Josephson junction
Variable thickness bridges

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1109/TASC.2010.2100352

Cite this

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title = "Fabrication and properties of high- Tc YBCO josephson junction and SQUID with variable thickness bridges by focused ion beam",

abstract = "We have successfully fabricated YBCO Josephson junctions and SQUIDs with variable thickness bridges. The variable-thickness bridges of YBCO thin film were fabricated by photolithography and Focused ion beam mill. The Josephson effects of variable thickness bridges were obtained in a 80 nm-thick-film of high- Tc YBa2Cu3Oy The Shapiro steps were observed in single junction in the gigahertz range from 3.02 to 14.64 GHz. The voltage-current and voltage-field characteristics were measured in SQUID magnetometer. The SQUID shows a peak-to-peak voltage swing of 1.5 μV at 70 K. The properties of one junction and SQUID magnetometer have been investigated.",

keywords = "Focused ion beam, Josephson junction, Variable thickness bridges",

author = "Wu, \{Chiu Hsien\} and Jhan, \{Fong Jyun\} and Chen, \{Jau Han\} and Jeng, \{Jen Tzong\} and Chen, \{Kuen Lin\} and Yang, \{Hong Chang\}",

note = "Funding Information: Manuscript received August 03, 2010; accepted December 11, 2010. Date of publication January 24, 2011; date of current version May 27, 2011. This work was supported by the National Science Council of Taiwan (NSC98-2112-M-005-006-MY3). C.-H. Wu and F.-J. Jhan are with the Institute of Nanoscience, National Chung Hsing University, Taichung 402, Taiwan (e-mail: [email protected]). J.-H. Chen is with the Department of Electrical Engineering, Da-Yeh University, Changhwa 515, Taiwan. J.-T. Jeng is with the Department of Mechanical Engineering, National Kaoh-siung University of Applied Sciences, Kaohsiung 807, Taiwan. K.-L. Chen and H.-C. Yang are with the Department of Physics, National Taiwan University, Taipei, Taiwan. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2010.2100352",

year = "2011",

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AU - Wu, Chiu Hsien

AU - Jhan, Fong Jyun

AU - Chen, Jau Han

AU - Jeng, Jen Tzong

AU - Chen, Kuen Lin

AU - Yang, Hong Chang

N1 - Funding Information: Manuscript received August 03, 2010; accepted December 11, 2010. Date of publication January 24, 2011; date of current version May 27, 2011. This work was supported by the National Science Council of Taiwan (NSC98-2112-M-005-006-MY3). C.-H. Wu and F.-J. Jhan are with the Institute of Nanoscience, National Chung Hsing University, Taichung 402, Taiwan (e-mail: [email protected]). J.-H. Chen is with the Department of Electrical Engineering, Da-Yeh University, Changhwa 515, Taiwan. J.-T. Jeng is with the Department of Mechanical Engineering, National Kaoh-siung University of Applied Sciences, Kaohsiung 807, Taiwan. K.-L. Chen and H.-C. Yang are with the Department of Physics, National Taiwan University, Taipei, Taiwan. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2010.2100352

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N2 - We have successfully fabricated YBCO Josephson junctions and SQUIDs with variable thickness bridges. The variable-thickness bridges of YBCO thin film were fabricated by photolithography and Focused ion beam mill. The Josephson effects of variable thickness bridges were obtained in a 80 nm-thick-film of high- Tc YBa2Cu3Oy The Shapiro steps were observed in single junction in the gigahertz range from 3.02 to 14.64 GHz. The voltage-current and voltage-field characteristics were measured in SQUID magnetometer. The SQUID shows a peak-to-peak voltage swing of 1.5 μV at 70 K. The properties of one junction and SQUID magnetometer have been investigated.

AB - We have successfully fabricated YBCO Josephson junctions and SQUIDs with variable thickness bridges. The variable-thickness bridges of YBCO thin film were fabricated by photolithography and Focused ion beam mill. The Josephson effects of variable thickness bridges were obtained in a 80 nm-thick-film of high- Tc YBa2Cu3Oy The Shapiro steps were observed in single junction in the gigahertz range from 3.02 to 14.64 GHz. The voltage-current and voltage-field characteristics were measured in SQUID magnetometer. The SQUID shows a peak-to-peak voltage swing of 1.5 μV at 70 K. The properties of one junction and SQUID magnetometer have been investigated.

KW - Focused ion beam

KW - Josephson junction

KW - Variable thickness bridges

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