MgB2 in bulk form shows great promise as a trapped field magnet (TFM) as an alternative to bulk (RE)BaCuO materials to replace permanent magnets in applications such as desktop high-field magnet systems and rotating machines. In addition to being inexpensive and lightweight, they exhibit a number of additional advantages: a long coherence length, smaller anisotropy, strongly-linked...
A REBCO bulk magnet can make a higher magnetic field than the existing permanent magnets and electromagnets. Recently, various applications of the bulk magnet, such as a compact NMR/MRI system, a magnetic separation system, a generator for a large-scale wind turbine, an electric motor for a ship propulsion system, an aircraft electric population system, and so on, have been developed and...
A magnetic flux lens (MFL) exploits the induced screening current during an in-situ zero field cooling magnetization process to enhance the local flux density. It is a passive device being equivalent to an inner coil of a hybrid magnet. However, it requires no power supply and quench protection.
The magnetic flux lens has been first realized by using bulk HTS superconductors, and been...
Iron-based superconductors (IBSs) are regarded as promiscing candidate for high magnetic field applications because of its relatively high superconducting transition temperature (Tc), and nearly isotropic upper critical field (Hc2) ~100 T. Amoung various IBSs, AEAFe4As4 (AE = Ca,Sr,Eu, A = K, Rb, Cs, 1144)[1] superconductors are one of the most recently developed IBSs with several unique...
REBa2Cu3Oy (RE123) melt-textured bulks are expected for high field applications using their excellent field trapping properties. RE123 melt-textured bulks are typically fabricated using the Top-Seeded Melt Growth (TSMG) or Top-Seeded Infiltration Growth (TSIG) method where bulks are melt grown from the seed crystals placed on top of the pellets, which...
The cost of high-field NMR systems has led to the development of low-cost ‘benchtop’ instruments for use by academic and commercial institutions. Whilst these devices have made NMR-spectroscopy more accessible, their use of permanent magnets limits the available resolution. Bulk high temperature superconducting (HTS) materials offer a route to bridge the performance gap to high-field...
REBa2Cu3Oy(RE123, RE: rare earth element) melt-textured bulks are used as superconducting magnets using their high field trapping (BT) properties. Their BT performances are enhanced by both enhancement of critical current density (Jc) and an increase in size of the bulks. We prepared all c-grown Gd123 melt-textured...
Single-grain REBaCuO superconducting bulks have significant potential as a trapped field magnet (TFM) because they can trap a magnetic field, BT, over several tesla. To enhance the BT value, reliable seeding methods for the fabrication of REBaCuO bulks is essential to increase critical current density, Jc. The top-seeded melt growth (TSMG) technique is a well-known growth method to...
REBCO melt-textured bulks are expected for strong magnet applications utilizing their high field trapping properties. Typical REBCO melt-textured bulks consist of a-growth and c-growth regions depending on the growth directions from the seed crystal placed on top of the pellets. We have developed a new method, Single-Direction Melt Growth (SDMG) method, for fabricating REBCO bulks wholly...
We have been developed the compact NMR magnets consisted of the stacked high temperature superconducting (HTS) bulks trapped by a field cooling (FC) method. The HTS bulk annuli magnet for compact NMR relaxometry operating in liquid nitrogen was analytically designed and experimentally demonstrated. On the other hand, the high-quality magnetic resonance imaging (MRI) techniques can provide...
REBaCuO, where RE denotes rare-earth elements, superconducting bulk materials are promising for high performance magnets that can trap large magnetic field in compact space. REBaCuO bulk materials are subjected to electromagnetic force and thermal stress in the devices. The electromagnetic force and thermal stress increase as the bulk size and critical current become larger. Thus improvements...
To magnetize superconducting bulks in a more cost-efficient way, pulsed-field magnetization (PFM) is a promising method using a conventional solenoid coil on a laboratory scale. The trapped field, BT, by PFM of a ring-shaped bulk reported to date is around 0.3 T at 60 K, which is quite low compared with that of field-cooled magnetization (FCM), as well as disc-shaped bulks by PFM. The reason...
