Abstract: Redistributing magnetic flux density within electro-magnetic or permanent magnet devices, as described herein, causes the device to increase its utilization of its magnetic core material and thereby increase its power density (Watts/volume). The preferred embodiment uses magnetic core bias currents, synchronized to the device's magnetizing current, through uniform, longitudinally isolated, magnetic core sections. The preferred embodiment can be complemented with local core bias currents that generate magnetic flux that oppose the incident magnetizing flux in local magnetic core sections with high flux density concentrations such as core corners. An alternative embodiment longitudinally interlaces magnetically isolated core sections of equal magnetic path length and uniform areal cross section. Another alternative embodiment redirects the magnetic flux in spiral wound inductors and transformers to the circumferential direction used in toroids.