A Comparative Study of Experimental and Simulated Trapped Magnetic Field of MgB₂ Bulks Prepared by the Magnesium Vapor Transport Process

Abstract

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Superstrength permanent magnets with iron-based superconductors by data- and researcher-driven process design

“…Figure 7 shows a 3D visualization of the distributions of the (a) current density and (b) trapped magnetic flux density within the bulks obtained from the field-cooling magnetization (FCM) model when the magnetizing field initially reached 0 T (t = 5250 s). The assembled disks exhibited collective bulk-like behavior, where the distributions of current density and magnetic flux density aligned with the characteristic trapped field patterns observed in magnetized bulk superconductors 61,62,65 . A high magnetic flux density was observed in the central region, accompanied by a related decrease in current density.…”

“…The sweep rate for demagnetizing the superconducting magnet from 7 to 0 T was 4.8 T/h. This sweep rate was faster than the typical sweep rates used during the magnetization of similar polycrystalline-type bulk magnets, MgB 2 [59][60][61][62] (e.g., 0.6 T/h, Badica et al 60 ), suggesting that relatively fast magnetization could be employed in Ba122 at low temperatures such as 5 K, potentially because of its high thermomagnetic stability. The magnetic flux density in the flux creep state, denoted as B T (t), could be reasonably approximated by the following equation:…”