Flux resetting characteristics of amorphous thin-tape cores up to megahertz region

Control magnetization curve (CMC) and switching characteristics of amorphous tape wound cores with tape thickness ranging from 5 mu m to 17.5 mu m have been examined. CMC is a constant-current flux reset characteristic, which was measured up to 1 MHz. A core with thinner tape exhibited a larger value of specific core gain in a wide range of control magnetizing force. Switching characteristics of the cores indicated that such a difference in CMCs reflects different mechanism of flux reversal. A core with thinner tape has a stripe-shaped domain pattern intersecting tape surfaces up to the MHz region, while a core with thicker tape has planar domain at that frequency.