TY - JOUR
T1 - Estimation of local current transport properties in thin film superconductor based on scanning hall-probe microscopy
AU - Higashikawa, Kohei
AU - Shiohara, Kei
AU - Inoue, Masayoshi
AU - Kiss, Takanobu
AU - Yoshizumi, Masateru
AU - Izumi, Teruo
N1 - Publisher Copyright:
© 2012 Materials Research Society.
PY - 2012
Y1 - 2012
N2 - To enhance a global critical current in a superconductor, it is indispensable to understand current limiting factors and their influence on such a critical current. From this point of view, we have investigated in-plane distribution of local critical current density and its electric field criterion in a thin-film superconductor by using scanning-Hall probe microscopy. In a remanent state, after the application of sufficiently high magnetic field to a sample, current flows at critical current density according to the critical state model. Such distribution of current density was estimated from that of measured magnetic field using the Biot-Savart law. Furthermore, the corresponding electric field criterion was evaluated from the relaxation of such remanent magnetic field by considering Faraday's law. This means that we could estimate in-plane distribution of local critical current density as a function of electric field criterion in a nondestructive manner. This characterization method would be very helpful for finding current limiting factors in a thin-film superconductor and their influence on its global current density versus electric field properties which would usually be obtained by four-probe method.
AB - To enhance a global critical current in a superconductor, it is indispensable to understand current limiting factors and their influence on such a critical current. From this point of view, we have investigated in-plane distribution of local critical current density and its electric field criterion in a thin-film superconductor by using scanning-Hall probe microscopy. In a remanent state, after the application of sufficiently high magnetic field to a sample, current flows at critical current density according to the critical state model. Such distribution of current density was estimated from that of measured magnetic field using the Biot-Savart law. Furthermore, the corresponding electric field criterion was evaluated from the relaxation of such remanent magnetic field by considering Faraday's law. This means that we could estimate in-plane distribution of local critical current density as a function of electric field criterion in a nondestructive manner. This characterization method would be very helpful for finding current limiting factors in a thin-film superconductor and their influence on its global current density versus electric field properties which would usually be obtained by four-probe method.
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U2 - 10.1557/opl.2012.1587
DO - 10.1557/opl.2012.1587
M3 - Conference article
AN - SCOPUS:84939147970
VL - 1434
SP - 57
EP - 62
JO - Materials Research Society Symposium - Proceedings
JF - Materials Research Society Symposium - Proceedings
SN - 0272-9172
IS - January
T2 - 2012 MRS Spring Meeting
Y2 - 9 April 2012 through 13 April 2012
ER -