TY - JOUR
T1 - Improvement of Persistent Magnetic Field Trapping in Bulk Y-Ba-Cu-O Superconductors
AU - Chen, In Gann
AU - Weinstein, Roy
N1 - Funding Information:
This work is supported in part by grants from the Department of Energy, Texas Center for Superconductivity, Electric Power Research Institute, and NASA Johnson Space Center.
PY - 1993/3
Y1 - 1993/3
N2 - Far type II superconductors, magnetic field can be trapped due to persistent internal super-current. Quasi-persistent magnetic fields near 2 Tesla at 60 K (and 1.4 T at 77 K) have been measured in mini-magnets made of proton irradiated melt-textured Y-Ba-Cu-0 (MT-Y123) samples. Using this effect, high field permanent magnets with dipole, quadrupole, or more complicated configurations can be made of existing MT-Y123 material, thus bypassing the need for high temperature superconductor (HTS) wires. A phenomenological current model has been developed to account for the trapped field intensity and profile in HTS samples. This model is also a guide to select directions of materials development to further improve field trapping properties. General properties, such as magnetic field intensities, spatial distributions, stabilities, and temperature dependance of trapped field will be discussed.
AB - Far type II superconductors, magnetic field can be trapped due to persistent internal super-current. Quasi-persistent magnetic fields near 2 Tesla at 60 K (and 1.4 T at 77 K) have been measured in mini-magnets made of proton irradiated melt-textured Y-Ba-Cu-0 (MT-Y123) samples. Using this effect, high field permanent magnets with dipole, quadrupole, or more complicated configurations can be made of existing MT-Y123 material, thus bypassing the need for high temperature superconductor (HTS) wires. A phenomenological current model has been developed to account for the trapped field intensity and profile in HTS samples. This model is also a guide to select directions of materials development to further improve field trapping properties. General properties, such as magnetic field intensities, spatial distributions, stabilities, and temperature dependance of trapped field will be discussed.
UR - http://www.scopus.com/inward/record.url?scp=0027554034&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0027554034&partnerID=8YFLogxK
U2 - 10.1109/77.233878
DO - 10.1109/77.233878
M3 - Letter
AN - SCOPUS:0027554034
SN - 1051-8223
VL - 3
SP - 1041
EP - 1044
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 1
ER -