Detection of Magnetic Signal in High-Tc Superconductor Devices by Scanning Laser Magneto-Optical Microscope

Author

Kitamura, Ryohei ; Murakami, Hironaru ; Kawayama, Iwao ; Tonouchi, Masayoshi

Author_Institution

Inst. of Laser Eng., Osaka Univ., Suita, Japan

Volume

19

Issue

3

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

745

Lastpage

748

Abstract

We have fabricated a superconducting vortex flow transistor (SVFT) device with a YBa₂Cu₃O_7-delta (YBCO) thin film on an MgO substrate. To detect the local magnetic flux state inside the superconducting loop of the device, we utilized a scanning laser magneto-optical microscope (SLMO). As a result we have succeeded in the observation of magnetic flux distribution in the device by applying dc-control current larger than 100 mA. Moreover, we could detect the time variation of local magnetic field in the superconducting loop as the MO signals by applying ac-control current with an amplitude of 100 mA at 500 Hz.

Keywords

Faraday effect; flux flow; high-temperature superconductors; magnetic flux; optical microscopy; superconducting thin films; superconducting transistors; yttrium compounds; Faraday effects; MgO; SLMO; SVFT device; YBa₂Cu₃O_7-delta-MgO; current 100 mA; frequency 500 Hz; high-temperature superconductor devices; magnetic field; magnetic flux state; magnetic signal detection; scanning laser magneto-optical microscopy; superconducting loop; superconducting thin film; superconducting vortex flow transistor device; Faraday effect; magnetic flux; magneto-optical microscope; superconducting device;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2009.2018536

Filename

5153046