@article{oai:iwate-u.repo.nii.ac.jp:00015686,
 author = {内藤, 智之 and 藤代, 博之},
 issue = {6},
 journal = {低温工学, Journal of Cryogenics and Superconductivity Society of Japan},
 month = {},
 note = {We have studied the trapped field properties of the MgB2 bulk superconductors fabricated by various methods. The MgB2 bulks were magnetized by a filed-cooled magnetization (FCM) method using a superconductor coil and a pulsed field magnetization (PFM) method using a copper coil. We firstly obtained a trapped field of 1.5 T at 14 K by FCM for an MgB2 disc bulk (30 mm diameter and 7 mm thickness) with a filling factor of about 50 %, which was fabricated by an in-situ capsule method using a home-made capsule. The trapped field of MgB2 bulk by FCM was enhanced up to 2.9 T by the densification and the enlargement. Such dense MgB2 bulks were fabricated by an in-situ hot isostatic pressing under the pressure of up to 980 MPa or an ex-situ spark plasma sintering by applying uniaxial stress of 50 MPa. An in-situ infiltration method without the physical pressure also produced the dense MgB2 bulks, which trapped a 3 T-class magnetic field. The Ti-doping improved considerably the trapped field by FCM up to 5.6 T at 11.3 K for the triple-stacked Ti-doped MgB2 bulks. The PFM method also produced a Tesla-class MgB2 bulk magnet. The trapped field of 1.1 T at 13 K was obtained for the HIP-processed MgB2 disc bulk (22 mm diameter and 20 mm thickness). A magnetic field of 1.6 T was trapped at 20 K in the MgB2 bulk composite, consisting of two ring-shaped MgB2 bulks sandwiched by four thin copper plates and an inserted soft-iron yoke cylinder, using double PFM using a split-type coil with softiron yokes. We have shown the potential of the MgB2 bulk magnets for the practical superconducting applications.},
 pages = {309--316},
 title = {MgB₂ 超伝導バルク磁石の現状と展望},
 volume = {56},
 year = {2021}
}