An embodiment of an inductor assembly includes at least a first inductive loop with a first wire formed into a plurality of conductive windings around a first magnetic core section. The first magnetic core section includes at least a radially inner magnetic core portion with a first inner effective radius, Rin(1), and a radially outer magnetic core portion with a first outer effective radius, Rout(1). The radially inner magnetic core portion is formed from a first material having a first core maximum permeability value, Mmax(1). The radially outer magnetic core portion is formed from a second material having a first core minimum permeability value, Mmin(1), less than the first core maximum permeability value, Mmax(1). A single turn of each winding extends fully around both the first radially inner and outer core portions without passing between them.