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Ultrafast magnetization reversal

A medium and equipment technology, applied in the fields of ultra-fast magnetization reversal, equipment and magnetization media, can solve the problems of speed limitation, unsuitable equipment, etc., achieve fast magnetization reversal, and improve the effect of data storage technology

Inactive Publication Date: 2003-11-19
IBM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Today's systems exhibit certain disadvantages, such as physical limitations in speed, making them unsuitable for newer generations of equipment

Method used

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  • Ultrafast magnetization reversal
  • Ultrafast magnetization reversal
  • Ultrafast magnetization reversal

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Embodiment Construction

[0053] The ultra-fast magnetic recording according to the present invention will be described in detail below with reference to the drawings and specifically to FIG. 1.

[0054] First, some basic aspects according to the present invention are described. In today's traditional magnetization reversal, the reversal field and the magnetization vector M are applied anti-parallel. The corresponding reversal speed is on the order of nanoseconds. If an external magnetic field H that causes magnetization reversal is applied substantially perpendicular to the magnetization vector M ex , According to the present invention, a much shorter reversal time can be achieved. In the magnetic layer or film, a demagnetization field H D Contribute to the externally applied magnetic field H ex Initiate magnetization reversal. Therefore, a weak magnetic field H ex (Also known as magnetic field pulse H ex ) Is sufficient to reverse the magnetization vector M in a planar magnetization layer or film. When a...

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Abstract

A scheme for ultrafast magnetization reversal in an in-plane magnetized layer is disclosed. For that, an external magnetic field Hex is applied such that the magnetization M precesses around the external magnetic field Hex and the external magnetic field Hex is maintained until the precession suffices to effect the magnetization reversal. The external magnetic field Hex is applied approximately perpendicular to the magnetization M.

Description

Technical field [0001] The invention relates to a method for ultra-fast magnetization reversal by means of a small applied magnetic field. More specifically, the present invention relates to magnetic recording. Background technique [0002] Magnetization reversal is the basic process that is the foundation of the key technologies of our civilization, such as variable voltage or magnetic recording. In the conventional magnetization reversal used today, the reversal magnetic field is applied anti-parallel to the magnetization direction. Therefore, the reversal speed is limited to the order of nanoseconds. [0003] Magnetic recording is a fringe field, involving physics, materials science, communications, and mechanical engineering. The physics of magnetic recording involves the study of magnetic heads, recording media, and the process of information transfer between heads and media. [0004] Many magnetic recording systems suitable for recording and storing data are known. The conv...

Claims

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Application Information

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IPC IPC(8): G11B5/00G11B5/02G11B5/09G11B5/74G11C11/16H01F13/00
Inventor 罗尔夫・阿林斯帕赫克里斯蒂安・H・巴克汉斯－克里斯托夫・斯格曼
Owner IBM CORP
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