  We present the design, fabrication, and characterization of a segmented
surface ion trap with integrated current carrying structures. The latter
produce a spatially varying magnetic field necessary for magnetic gradient
induced coupling between ionic effective spins. We demonstrate trapping of
strings of 172Yb+ ions, characterize the performance of the trap and map
magnetic fields by radio frequency-optical double resonance spectroscopy. In
addition, we apply and characterize the magnetic gradient and demonstrate
individual addressing in a string of three ions using RF radiation.
