{HEAD ~ A magnetic disk} 10, wherein {TAIL ~ the first and second fluoropolyethers} form individual layers alternately, and interfaces between the individual layers are formed by the ionic bonding through salt formation of the acidic terminal groups and the basic terminal groups 
wherein
{ HEAD ~ A magnetic disk } 10 , wherein { TAIL ~ the first and second fluoropolyethers } form individual layers alternately , and interfaces between the individual layers are formed by the ionic bonding through salt formation of the acidic terminal groups and the basic terminal groups
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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