Efficient Two-Step PFM Process Employing Novel Crossed Fields Combination

Abstract

A reliable in-situ magnetization technique is crucial for exploiting the remarkable magnetic flux trapping capability of bulk superconductors in practical applications, such as nuclear magnetic resonance, MRI, superconducting rotating machines, and superconducting undulators. It has been reported that the magnetization efficiency of bulk superconductors can be improved by exploiting flux jump. We propose a novel magnetization method named crossed pulsed fields magnetization, combining a transverse pulsed field magnetization (PFM) followed by a perpendicular PFM. The experimental results suggest that transverse premagnetization can reduce the perpendicular pulsed field required for magnetization by exceeding 1.2 T and increase the magnetization efficiency by approximately 9.5% both at 50 and 30 K, which is of great significance to the practical applications of single-grain YBaCuO (YBCO) bulk superconductors in electromagnetic devices.