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