A powder core 1 wherein said upper layer coating has {HEAD ~ an average thickness} of {TAIL ~ at least 10 nm} and no more than 1 micron 
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A powder core 1 wherein said upper layer coating has { HEAD ~ an average thickness } of { TAIL ~ at least 10 nm } and no more than 1 micron
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH