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We fabricated a compact (13$\times$12$\times$12.5 mm${^3}$) trapped-fieldmagnet by stacking 200 pieces of EuBa${_2}$Cu${_3}$O${_7}$ coated conductorswith BaHfO${_3}$ nanorods as artificial pinning centers. It was magnetized byfield-cooling method using a 18 T superconducting magnet, and the maximum fieldof 14.8 T was trapped at 10 K at a field-ramp rate of 0.1 T/min. At highertemperatures, although the trapped field was decreased, we could trap the fieldwith much faster ramp rate. In order to understand these results, we alsoperformed calculations of the trapped field based on $J_\mathrm{c}-H$characteristics of the coated conductor. The calculated trapped field value waslarger than the experimental value at 10 K. This discrepancy can be understoodby considering the reduction of the effective size of the stacked coatedconductors due to the existence of extended regions of irregular fluxpenetration called "flux jets".

Trapping a magnetic field of 14.8 T using stacked coated conductors of 12 mm width