Abstract
The local and global critical current densities of polycrystalline bulks Sr0.6K0.4Fe2As2 were investigated by both the remnant magnetic moment and Campbell’s methods. It was found that the global critical current density was improved by addition of Ag. It was speculated that the reason for the enhancement of the global critical current density was ascribed to the enlarged size of particle and the clean boundaries due to addition of Ag. It was also found that the critical current density estimated from usual magnetization measurement was a type of average value of both local and global critical current densities and can be explained by simple contributions from magnetic moments by local and global shielding currents. Therefore, the size of the grain was estimated by the present model and the agreement with the observation by SEM was obtained.
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