Vortex migration caused by travelling magnetic wave in a 2 in. diameter YBa2Cu3O7−δ thin film

Abstract

Field dependent alternating current susceptibility of metalorganically deposited YBa 2 Cu 3 O 7 − δ films

Direct measurement of the vortex migration caused by traveling magnetic wave

“…As shown in our previous publication, the increase of the flux density in the centre of the sample happens mostly in the first three cycles (predominantly the first period). 4 The following cycles do not change the magnetization very much. In Fig.…”

“…The experimental setup and some early experimental results of the CTMFP system had been reported in our previous publications. 4,8,9 The CTMFP is the conceptual combination of the thermally actuated flux pump 10 and the linear type magnetic flux pump (LTMFP). 11 Fig.…”

Magnetization of YBCO film with ac travelling magnetic waves of relatively short wavelengths

“…To understand the above mentioned problem, a "circular-type magnetic flux pump" (CTMFP) device [9][10][11] was previously built, to study the magnetization of HTS YBa 2 Cu 3 O 7-d film in ac travelling magnetic waves. In the CTMFP experiments, both the YBCO film and the applied field are axial-symmetric, while the magnetization behaviour can be directly compared with the classic magnetization model for type-II superconductor.…”

“…1 In this paper, we have built an updated CTMFP device, shortening the produced wavelengths to half and quarter of the previous experiment. 10 An updated numerical model have also been built to reveal the causation of the induced intermediate values of current densities. Fig.…”

“…The geometry of the setup is axial-symmetric. The phase windings in the CTMFP magnets generate axialsymmetric ac travelling magnetic waves, 10 while the flux are perpendicular to the a-b plane of the YBCO film. The detailed experimental setup can be found elsewhere.…”