scholarly journals High-speed scanning Hall-probe microscopy for two-dimensional characterization of local critical current density in long-length coated conductor

2012 ◽  
Vol 27 ◽  
pp. 228-231 ◽  
Author(s):  
Kohei Higashikawa ◽  
Kei Shiohara ◽  
Yoshihiro Komaki ◽  
Keitaro Okumura ◽  
Kazutaka Imamura ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Speed ◽  
Coated Conductor ◽  
Hall Probe ◽  
Two Dimensional ◽  
Probe Microscopy ◽  
Scanning Hall Probe Microscopy

Estimation of Local Current Transport Properties in Thin Film Superconductor Based on Scanning Hall-probe Microscopy

2012 ◽  
Vol 1434 ◽  
Author(s):  
Kohei Higashikawa ◽  
Kei Shiohara ◽  
Masayoshi Inoue ◽  
Takanobu Kiss ◽  
Masateru Yoshizumi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Critical Current Density ◽  
Electric Field ◽  
Critical Current ◽  
Current Density ◽  
Limiting Factors ◽  
Hall Probe ◽  
Scanning Hall Probe Microscopy ◽  
Field Criterion

ABSTRACTTo 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.

Characterization of Critical Current Distribution in Roebel Cable Strands Based on Reel-to-Reel Scanning Hall-Probe Microscopy

2017 ◽  
Vol 27 (4) ◽  
pp. 1-4 ◽  
Author(s):  
Kohei Higashikawa ◽  
Xiang Guo ◽  
Masayoshi Inoue ◽  
Zhenan Jiang ◽  
Rodney Badcock ◽  
...  
Keyword(s):  
Critical Current ◽  
Current Distribution ◽  
Hall Probe ◽  
Probe Microscopy ◽  
Scanning Hall Probe Microscopy

Study on the High Speed Jet-Electrode Position Ni-P Alloy

2013 ◽  
Vol 567 ◽  
pp. 39-44
Author(s):  
Ying Wang ◽  
Min Kang ◽  
Yong Yang ◽  
Xiu Qing Fu
Keyword(s):  
Grain Size ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Speed ◽  
Electrode Position ◽  
Stirring Intensity

The high speed jet-electrodepositing equipment was used to prepare Ni-P alloy in substrate of 45 steel. The influences of current density on depositing rate, hardness of deposit and microstructure of Ni-P alloy were studied, and the comparation with that of conventional electroplating were studied. The results show that with the increase of stirring intensity of the electrolyte, the thickness of diffused layer decreases, the critical current density increases, and then the depositing rates increase to 69.82/min. A linear increasing of the depositing rate with the increase of current density is observed, and it refines grain size obviously. Deposit hardness up to 679HV.

scholarly journals Variable-temperature characterization of NbTi strands in the low critical-current density range

2008 ◽  
Vol 97 ◽  
pp. 012306 ◽  
Author(s):  
L Affinito ◽  
S Chiarelli ◽  
V Corato ◽  
A della Corte ◽  
G De Marzi ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Variable Temperature ◽  
Density Range ◽  
Current Density Range
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