The Ta concentration in the insulating barrier layer is set to be more than 0 at % but not more than about 7 at % with respect to a total of 100 at % of Ti and {TAIL ~ Ta} constituting {HEAD ~ the insulating barrier layer} 
The Ta concentration in the insulating barrier layer is set to be more than 0 at % but not more than about 7 at % with respect to a total of 100 at % of Ti and { TAIL ~ Ta } constituting { HEAD ~ the insulating barrier layer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD