The development of rare earth (RE) Ba
2Cu
3O
y (REBCO) coated conductors has been carried out by many groups. The critical current density (
Jc) in high magnetic fields needs to be improved for superconducting applications. We have fabricated BaHfO
3 (BHO)-doped SmBa
2Cu
3O
y films on ion beam-assisted deposition (IBAD)-MgO substrates using pulsed laser deposition (PLD). In this study, we introduce a seed layer technique. As a result, the appropriate growth temperature (
Ts) is expanded to higher temperature range without BaCeO
3 outgrowth around the interface of the SmBCO and CeO
2 cap-layer. We were able to control the configurations of the BHO nanorods within the SmBCO films as compared to the conventional PLD method. The SmBCO + BHO (1.4 vol.%) films, which were fabricated at a
Tsupper of 900ºC, showed that the
Jc in the magnetic field (
B //
c) was improved as compared to pure-SmBCO films. Furthermore, the global pinning force density reached 21 GN/m
-3 at 77 K in
B = 2 T.
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