Abstract
We report the effect of permanent magnet (PM) collars on the flux-creep rate of magnetized bulk HTS. The creep rates of single-grain, cylindrical samples are measured with attached collars activated to various fields, BPM, in the range 0 ≤ BPM ≤ BPM,max, where BPM,max is the fully saturated field of the PM. As BPM varies, the creep rate of the HTS is found to maintain its well-known form—a constant fractional loss λ, of original residual field, per decade of time. However, the magnitude of λ decreases as BPM increases. The decrease in λ is found to be linearly dependent on increasing BPM. The collar field for which flux-creep extrapolates to zero is found to be comparable to the maximum trappable field of the HTS bulk, BT,max. The properties of the dependence of λ on the HTS peak field, BT,max, the PM field, BPM, and the creep rate λ0 with BPM = 0 permit the reduced creep rate in these experiments to be predicted by a universal equation.
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