{HEAD ~ A saturation magnetization Ms} of {TAIL ~ the free layer} satisfies a relationship 0≦Ms<√{square root over }{Jw/} 
of
{ HEAD ~ A saturation magnetization Ms } of { TAIL ~ the free layer } satisfies a relationship 0≦Ms<√{square root over } { Jw/ }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH