Magneto-luminescent transducer

a technology of electromagnetic light and transducer, which is applied in the direction of electrical equipment, semiconductor devices, instruments, etc., can solve the problem that none of the available devices provide a one-step process for reading magnetic data, and achieve the effect of facilitating light emission and without substantially burdening the system processor

Inactive Publication Date: 2005-01-13
PRESIDENT & FELLOWS OF HARVARD COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows storing vast quantities of digital data onto small discs or drums with very little effort compared to traditional methods like scanning tape cartridges. By utilizing this method instead of relying heavily upon CPU processing power, these technical benefits include improved efficiency and reduced costs associated therewith.

Problems solved by technology

This patented technology improves upon how Magneto Resistive (MR) sensors are being integrated with Optics Data Storage Disks (ODS). However, current methods require multiple steps involving processing electronics after it converts signals onto LSIs, which makes them difficult to use on small hard disks like those commonly found today due to their size limitations.

Method used

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Embodiment Construction

[0029] The present inventors recognized that a magnetic field sensor, such as a hot electron spin valve transistor, could be modified to provide light emission modulated by the magnetic field.

[0030] The device of the present invention could be used to read digital magnetic data 30 from a magnetic storage medium, such as magnetic disk 32, and convert magnetic signal 34 directly into optical signal 36 for transmission along optical fiber 38, as shown in FIG. 1. Substantial simplification and savings are thereby obtained since magnetic signal 34, encoded in the stray field of magnetic data 30, is converted to an electrical signal and optical signal 36 within read head 40 that includes single device magnetic to optical transducer (MOT) 42. The processing of data stored on magnetic disk 32 is simplified. Routing electrical data from an ordinary magnetic read head through a processor and then to a light emitting diode or laser is eliminated. Large volumes of data can now be transmitted from

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Abstract

An electronic system includes a three terminal device having a light emitting portion and a magnetically sensitive portion. The magnetically sensitive portion is for modulating light emission from the light emitting portion. The device is a spin valve transistor having a light-emitting quantum well in its collector. The device can convert a magnetic digital signal to both an electrical digital signal and an optical digital signal, wherein either or both of these signals can be provided as a device output. The magnetically sensitive portion of the device is formed of a pair of magnetically permeable layers. When the layers are aligned electron current can pass through with sufficient energy to reach a quantum well where they recombine, generating light. The device may be used to read a magnetic storage medium, such as a disk drive. Or it can be used to provide a display or a memory array composed of single device magnetic write, optical read memory cells. Amplification can be provided to the transistor by adjusting the collector base voltage to provide secondary electrons by impact ionization to provide greater electron current and a correspondingly larger optical emission signal.

Description

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Claims

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Application Information

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Owner PRESIDENT & FELLOWS OF HARVARD COLLEGE
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