Ferromagnetic powder for low core loss parts

Ferromagnetic powder comprising:

• a. a plurality of ferromagnetic particles having a diameter size of from about 40 to about 600 microns;
• and
• b. a coating comprising from about 40% to about 85% by weight of a member selected from the group consisting of FeO, Fe3O4, Fe2O3,(Fe2O3·H2O) and combinations thereof;
• and from about 15% to about 60% by weight of a member selected from the group consisting of FePO4, Fe3(PO4)2, FeHPO4, Fe3(PO4)2·2H2O, Fe2(PO4)3·8H2O, FeCrO4, FeMoO4, FeC2O4, FeWO4, and combinations thereof, disposed on each of said particles wherein said coating permits adjacent particles to engage one another with a force such that a part made by compressing said ferromagnetic particles having said coating disposed thereon has a transverse rupture strength of at least about 8 Kpsi as measured in accordance with ASTM C1161-94, wherein said coating has an electrical insulation value as determined between adjacent ones of said ferromagnetic particles that does not substantially degrade when subjected to temperatures of greater than about 150° C.