Human Brain Like Memory Behavior in the Magnetic Domain Expansion Type Magneto-Optical Disk
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Human Brain Like Memory Behavior in the Magnetic Domain Expansion Type Magneto-Optical Disk Norio Ota, Hiroyuki Awano, Manabu Tani and Susumu Imai R&D Division, Hitachi Maxell Ltd. 6-20-1 Kinunodai, Yawaramura, Ibaraki 300-2496 Japan ABSTRACT Magnetic Amplifying Magneto-Optical System (MAMMOS) shows human brain like memory behavior. Magnetic field and laser power have threshold to recover the stored memory like the human response of remembering. MAMMOS also has a feature to amplify very small recorded signals like our recovery of memory, e.g. fifty years ago episode. By adding the meaningful information on the magnetic field pattern, we can get some correlation between our memory and external stimulation. Such scheme is named as ”the Active readout MAMMOS” which is analogues to the human process of remembering the memory. If the applied field pattern and timing phase just coincide with stored information, there occurs the coherent amplification of MAMMOS signal. We can utilize such phenomena as the trigger of “Memory Association”.
INTRODUCTION Human brain long term memory is so mysterious comparing the current man made disk storage like magnetic disks and optical disks. During our life, we may store so huge memory contents inside our brain. In our usual daily life, we never aware of such terribly giant memories almost seems that we had forgotten almost 99.9% or more. However, once we are stimulated by specific scenes or sounds, we can clearly remember the old episode. Recent study on brain’s long term memory [1] shows very interesting hypothesis, that is, memory perception (writing) and memory retrieval (readout) are bi-directional signaling between temporal cortex (TE) and peripheral cortex (PRh). By the visual pair-association task tested in monkey brain, long term memory stored in PRh are retrieved TE neurons. Magnetic amplifying magneto-optical system (MAMMOS) gives very huge capacity rewritable disk by using a domain expansion phenomenon in a readout layer overlayered on a recording layer [2,3]. In the area of Magneto-Optical disk storage, the analogy of PRh to the recording layer and TE to the readout layer is useful to create the new type of human made memories. In the very high density area overcoming the optical resolution limit, MAMMOS shows very high signal to noise ratio [3]. For readout, we used mono tonesingle frequency external magnetic field to expand and collapse the magnetic domain. In this scheme, external magnetic field only plays giving the excitation energy to readout very faithfully a series of chained stored information. However, once we changed such scheme, that is, if we intentionally give the some
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meaningful information on the external magnetic field on behalf of mono-tone field repetition, we can expect human brain like memory behavior in MAMMOS as a new type of association memory, which retrieves long term memory stored in the recording layer. Here, we firstly show such experiments under the name of “Active readout MAMMOS”.
PRINCIPLE OF BASIC MAMMOS AND EXPERIMENTS MAMMOS dis
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