Magnetic torque transferring study for bulk High-Tcsuperconductors and permanent magnets

Wongsatanawarid, A.; Suzuki, A.; Seki, Hiroya; Murakami, Masato

doi:10.1088/1742-6596/153/1/012035

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…Figure 6 shows a contour map of the magnetic field trapped by sample D. Four peaks with N-S-N-S configuration similar to that of the activating magnets were observed. However, compared to the previous data for a single-domain Y-Ba-Cu-O sample [3], the peak field was rather low, in that the peak was only 0.04 T for the present sample, while that of the single domain was 0.15 T. This is due to the fact that the size of the Y211 secondphase particles was not refined since Pt or CeO 2 addition was not performed in the present samples.…”

Section: Resultscontrasting

confidence: 88%

“…In the previous work [3], we observed four peaks similar to figure 9 in the trapped field distribution of a single-domain sample. Hence, one can conclude that, for torque transferring applications using permanent magnets, multi-seeded superconductors can replace a single-grain superconductor.…”

Section: Resultssupporting

confidence: 71%

“…The magnitude of the transferable magnetic torque force is dependent on the initial gap, the flux pinning performance of the superconductor, the arrangement and the field strength of the permanent magnets. In the previous study [3] it was found that a magnetic circuit with four magnetic poles provided more stable levitation and higher coupling forces than a two-pole configuration. When the magnetic field distribution trapped by a single-domain superconductor was monitored, four magnetic poles similar to the magnetic circuit were observed, reflecting the field distribution of the magnetic circuit.…”

Section: Introductionmentioning

confidence: 95%

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Growth of large bulk Y–Ba–Cu–O with multi-seeding

Wongsatanawarid¹,

Seki²,

Murakami³

2010

Supercond. Sci. Technol.

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Large bulk Y-Ba-Cu-O superconductors, 62 mm in diameter and 12 mm in thickness, have been fabricated by a cold seeding method in which four seeds are placed on top of the precursor at room temperature prior to melt processing. The advantage of a cold seeding technique is that the desired seeding location can be arranged at room temperature. However, due to the reaction of the seed with the precursor at high temperatures, controlled single-grain growth has been difficult. In the present study, we carefully investigated the influence of the processing parameters such as the maximum heating temperature, the dwelling time at this temperature, the temperature to start slow cooling and the slow cooling rate on the grain growth behavior. Through the optimization of these processing parameters, we have succeeded in growing large bulk Y-Ba-Cu-O with four large grains. The sample with 1 wt% CeO 2 addition showed almost the same field trapping ability as a single-domain sample.

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Section: Resultscontrasting

confidence: 88%

Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 95%

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Growth of large bulk Y–Ba–Cu–O with multi-seeding

Wongsatanawarid¹,

Seki²,

Murakami³

2010

Supercond. Sci. Technol.

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“…For this purpose, a magnet circuit must have a multi-pole configuration like NSNS. When field-cooled with such a magnetic circuit in face, a single domain bulk superconductor is magnetized like a mirror image, in that almost the same pole configuration of NSNS is trapped [2,3]. Thus we fabricated a multi-domain superconductor, and confirmed that it could have almost the same torque transferable forces as a single domain.…”

Section: Introductionmentioning

confidence: 53%