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