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A trapped magnetic field of greater than 3 T has been achieved in a singlegrain GdBa2Cu3O7-{\delta} (GdBaCuO) bulk superconductor of diameter 30 mm byemploying pulsed field magnetisation (PFM). The magnet system is portable andoperates at temperatures between 50 K and 60 K. Flux jump behaviour wasobserved consistently during magnetisation when the applied pulsed field, Ba,exceeded a critical value (e.g. 3.78 T at 60 K). A sharp dBa/dt is essential tothis phenomenon. This flux jump behaviour enables the magnetic flux topenetrate fully to the centre of the bulk superconductor, resulting in fullmagnetization of the sample without requiring an applied field as large as thatpredicted by the Bean model. We show that this flux jump behaviour can occurover a wide range of fields and temperatures, and that it can be exploited in apractical quasi-permanent magnet system.

A portable magnetic field of > 3 T generated by the flux jump assisted, pulsed field magnetisation of bulk superconductors