Unidirectional self-sustained motion of magnetic domain boundaries in YIG plate in alternating magnetic field. Applications to digital optical sensors

Summary form only given. In the present work the YIG plates ferromagnetic domain structure behavior with artificial nonuniformity of axial symmetry is introduced into the plate under the action of alternating and constant magnetic fields and/or constant external mechanical tension. The effect of unidirectional domains speed value variation and direction dependence on a constant magnetic field and external mechanical tension were observed and investigated. The application of the effect of unidirectional stripe domain motion speed and direction dependences on small magnetic fields and mechanical tension to the design of digital magnetooptical sensors of mechanical tension and magnetic fields is proposed. The new sensors proposed could hopefully demonstrate potentially the reliability of optical systems and the precision of digital ones. The experimental prototype of the magnetic field digital optical transducer is constructed demonstrating the sensitivity of /spl sim/10/sup -4/ Oe per digit. The maximum used frequency of the alternating magnetic field was about 2 MHz, the frequency of the unidirectional domain motion was equal to 60 kHz.