Laser induction magnetic record dynamic test method and system
A dynamic testing and laser-induced technology, which is applied in the fields of optics, magnetism and information storage, can solve the problems of the inability to test the dynamic performance of new high-coercive magnetic recording media, the inability to overcome the superparamagnetic effect, and the difficulty of storage density. , to achieve the effect of improving magnetic storage density, precise collimation and focus servo, and simplifying the optical auxiliary system
Inactive Publication Date: 2011-03-23
FUDAN UNIV
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Problems solved by technology
With the continuous improvement of storage density, the existing magnetic recording media cannot overcome their own superparamagnetic effect, making it very difficult to increase the storage density by relying solely on the existing magnetic recording method, and it is necessary to find a higher coercive force materials, and effectively reduce the writing field of the magnetic head by means of thermal assistance during recording
However, the Guzik test system is powerless to test the dynamic performance of new high-coercivity magnetic recording media because there is no laser-assisted method.
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[0024] Laser-induced magnetic recording dynamic test method of the present invention such as figure 1 As shown, it uses a laser with a certain frequency as the inductive light source, adopts the method that the optical head and the magnetic recording head are located on the opposite side of the magnetic recording disk, and under the monitoring of a high-resolution CCD detector, it uses a three-dimensional precision nano-moving stage combining macro and micro Drive the optical head to realize the tracking servo and focus servo of the optical head and the magnetic head. At the speed of 2000~10000 rpm, when the induction laser is irradiated, the GUZIK dynamic magnetic recording system is driven to complete the dynamic writing or erasing of information; no induction laser When irradiated, the dynamic readout process of recorded information is carried out, and finally the high-speed and high-density dynamic storage test of information is realized.
[0025] According to the above te...
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Abstract
The invention provides a dynamic testing method and a testing system of laser-induced magnetic recording. The mainly involves a technical scheme, which is based on the selection response of a magnetic storage medium, the thermo magnetic effect, the giant magneto resistive effect and the like, for super high density, high speed and magneto-optical mixed dynamic storing. The dynamic test method andthe dynamic test system are novel method and novel technology in the field of optical and magnetic storage development at present. By adopting a laser with certain wavelength and continuously adjustable power as an assistant light source of a thermal induction, and selecting a plate made from a magnetic recording medium which is matched with the optical frequency, the invention utilizes the magnetic field modulation and the dynamic reading and writing mode of a giant magneto resistive head at a rotating speed of 2000-10000 revolution per second to further cause the medium to realize magnetic domain reversal under an appropriate magnetic field modulation (longitudinal magnetic recording or vertical magnetic recording) at the information record point, thereby realizing dynamic recording, erasing and reading through laser-induced magnetic modulation.
Description
technical field [0001] The invention relates to a laser-induced magnetic recording dynamic testing method and system, belonging to the technical fields of optics, magnetism and information storage. Background technique [0002] Magnetic recording has a history of more than 100 years. Since its development, the storage medium and technology have been perfected day by day. The optical storage technology emerged in the 1970s and quickly formed an industry in the 1980s; since then, optical storage and magnetic storage technologies have been developing together in the pursuit of high-speed, high-density, and mass storage competition. Due to the continuous efforts of science and technology and industry circles in various countries, along with the continuous research and development of new materials and new technologies, such technologies still maintain a certain development momentum. Our research in this field has also achieved fruitful results, and has certain independent intell...
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IPC IPC(8): G11B27/36G11B5/02G11B11/105
Inventor 李晶廖嘉霖魏慎金金庆原
Owner FUDAN UNIV