The magnetic storage device 9 wherein {TAIL ~ the material} filling the trench is {HEAD ~ copper} 
The magnetic storage device 9 wherein { TAIL ~ the material } filling the trench is { HEAD ~ copper }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD