摘要
The accelerated growth of data streams shows the growth interest in development of the new family of data handling devices with heightened speeds-magnetooptic (MO) disks, time-space transparences, modulators and other. The most significant problem is necessity to expect from the used of magnetic mediums the high domain wall (DW) motion (up to 20×103 m/s); such materials are the weak ferromagnets, for example, orthoferrites. The unique combination of it with high magnetooptic quality factor in visual area of such materials increases their practical value. МО transparency on the basis of such materials allows reaching frequency of data processing up to 5 MHz, with substantially accessible size of a cell in 1 micron. The new, detected by us, elastic-induced mechanism of demagnetization (EIMD) in rare earth orthoferrites, when the wave of demagnetization is spread with velocity considerably superior to a limiting velocity of the stationary DW motion, gives high practical concern. The ascertaining of requirements, when it possible to origin such mechanism of demagnetization, and management by them makes actual the development of МО time-space transparency. When the EIMD arises, the travelling velocity of DW becomes higher than limiting. To perform this, the light modulation frequency increases up to several GHz.
The accelerated growth of data streams shows the growth interest in development of the new family of data handling devices with heightened speeds-magnetooptic (MO) disks, time-space transparences, modulators and other. The most significant problem is necessity to expect from the used of magnetic mediums the high domain wall (DW) motion (up to 20×103 m/s); such materials are the weak ferromagnets, for example, orthoferrites. The unique combination of it with high magnetooptic quality factor in visual area of such materials increases their practical value. МО transparency on the basis of such materials allows reaching frequency of data processing up to 5 MHz, with substantially accessible size of a cell in 1 micron. The new, detected by us, elastic-induced mechanism of demagnetization (EIMD) in rare earth orthoferrites, when the wave of demagnetization is spread with velocity considerably superior to a limiting velocity of the stationary DW motion, gives high practical concern. The ascertaining of requirements, when it possible to origin such mechanism of demagnetization, and management by them makes actual the development of МО time-space transparency. When the EIMD arises, the travelling velocity of DW becomes higher than limiting. To perform this, the light modulation frequency increases up to several GHz.
