Magneto-optical current sensors of high bandwidth

A new current transformer is described by means of new results concerning t he domain wall excitation in orthoferrites. The measured parameter is the g eometrical position of the boundary between domains with opposite magnetiza tions. In a wide frequency band, including DC currents, the measurement res ults are a linear function of the measured current due to the very high dom ain wall velocity. They are not affected by temperature changes and mechani cal factors. (C) 2000 Elsevier Science B.V. All rights reserved.