3results about "Light beam reproducing" patented technology

A magnetic medium is described which includes a thin film magnet structure formed of a ferromagnetic alloy or compound. The thin film magnet structure includes one or more ferromagnetic domains and is coupled to one or more optical structures. Each of the one or more ferromagnetic domains have a magnetization that is switchable between two or more states. Each of the one or more optical structures is configured to increase absorbance of light at a target wavelength in the thin film magnet structure, such that in response to illumination of a ferromagnetic domain with continuous-wave light including the target wavelength, that ferromagnetic domain undergoes all-optical magnetic switching.

The classification device (1) comprises a pre-processing unit (10), an identification unit (30), and a material system (20) positioned between the pre-processing unit and the identification unit. The material system (20) comprises a heterogeneous magnetic medium (50) subdivided into a plurality of regions (51), each region being magnetically connected to at least one adjacent region via a coupling link (53). According to the present invention, the material system (20) further comprises control means (71, 73) for setting the coupling value of each coupling link.

Provided is a magnetic disk device capable of improving performance and data reliability. A magnetic disk device according to an embodiment includes: a disk having a first track; a head which has a heater and which writes data to and reads data from the disk; and a controller that divides the first track into a plurality of divided regions, and sets a plurality of refresh thresholds for executing rewrite processing for each of the plurality of divided regions in the first track. When it is determined that a first number of writes for data to an adjacent division region adjacent to a first division region in the radial direction of the disk among the plurality of division regions is greater than a first refresh threshold among the plurality of refresh thresholds corresponding to the first division region, processing for rewriting data is performed in the first track.