Suppression of magnetic relaxation processes in melt-textured YBa$_2$Cu$_3$O$_x$ superconductors by a transverse ac magnetic field

TL;DR

This study demonstrates that applying a transverse AC magnetic field significantly suppresses magnetic relaxation in melt-textured YBa₂Cu₃Oₓ superconductors by enhancing pinning forces, with minimal impact on the trapped magnetic field.

Contribution

It reveals a method to reduce magnetic relaxation in superconductors using transverse AC fields, improving their stability for practical applications.

Findings

50-fold suppression of relaxation rate

Increase in pinning force confirmed by trapped-induction distribution

Minimal reduction in maximum trapped field

Abstract

The effect of the transverse AC magnetic field on relaxation process in YBa$_2$Cu$_3$O$_x$ melt-textured superconductor was studied. A factor of 50 suppression of the relaxation rate could be achieved at the expense of some reduction in the maximum trapped field, with the magnetic-induction gradient being unchanged. This phenomenon is interpreted as a result of an increase of the pinning force after the action of the transverse AC magnetic field that is confirmed by the measurement of the trapped-induction distribution.