Gamma-ray cascades from nanosecond isomers in neutron-rich nuclei 67 Cu and 64 Co have been observed through heavy-ion deep-inelastic collisions of 198 Ptϩ 76 Ge ͑8 MeV/nucleon͒ using an isomer-scope. In 67 Cu, an isomeric state at 3464 keV and its decay scheme have been established. The isomeric transition is a hindered M 1 transition between the 15/2 ϩ and the 13/2 ϩ states with main components of (p 3/2 g 9/2 f 5/2 Ϫ1 ) 15/2 ϩ and (p 3/2 g 9/2 p 1/2 ) 13/2 ϩ, respectively. A fast E3 transition between the g 9/2 and the p 3/2 single-particle states indicates strong particle-octupole vibration coupling in 67 Cu. An isomeric state at 834 keV with T 1/2 ϭ6.4(3) ns has been identified in 64 Co. Proton-neutron configurations of the levels established in 64 Co are discussed.