Efficient stopping of current-driven domain wall using a local Rashba   field
  We theoretically show that a locally-embedded Rashba interaction acts as a strong pinning center for current-driven domain walls and demonstrate efficient capturing and depinning of the wall using a weak Rashba interaction of the order of 0.01 eV{\AA}. Our discovery is expected to be useful for the highly reliable control of domain walls in racetrack memories. 
Gen Tatara, Henri Saarikoski, Chiharu Mitsumata
cond-mat.mes-hall