A magnetic tunnel junction (MTJ) head for a magnetic recording system includes a MTJ valve and a first flux guide disposed proximate a first edge of the MTJ valve. The first flux guide has a first portion, which defines the track width, proximate a an air bearing surface of the MTJ head and a second...http://www.google.es/patents/US6542343?utm_source=gb-gplus-sharePatente US6542343 - Tunnel valve head design to lower resistance
