Unlock instant, AI-driven research and patent intelligence for your innovation.

Recording method, recording apparatus, reproduction method, reproduction apparatus, and high-speed response element

A recording method and magnetic recording technology, applied in the recording/reproducing/erasing method, magnetic recording, data recording and other directions, can solve the problem of loss of magnetization thermal stability and so on

Active Publication Date: 2022-07-29
THE UNIV OF TOKYO +2
View PDF35 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is believed that the S / N ratio of the signal can be increased with the miniaturization of magnetic particles. On the other hand, the stability of magnetization to heat is proportional to the magnetic anisotropy constant and the particle volume, so the heat of magnetization is lost due to miniaturization. stability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Recording method, recording apparatus, reproduction method, reproduction apparatus, and high-speed response element
  • Recording method, recording apparatus, reproduction method, reproduction apparatus, and high-speed response element
  • Recording method, recording apparatus, reproduction method, reproduction apparatus, and high-speed response element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

[0050] (1) ε iron oxide particles used as a magnetic recording material in the recording apparatus of the present invention

[0051] In the recording apparatus of the present invention, as a magnetic recording medium, it is desirable to apply a magnetic recording medium using ε iron oxide particles having a high coercivity Hc as a magnetic recording material. In the present invention, even if ε iron oxide particles having high coercivity Hc are used as the magnetic recording material, by irradiating light, it is possible to use a low external magnetic field without using a magnetic head having a high-level saturation magnetic flux density. Magnetization reversal to record information.

[0052] Here, first, the ε iron oxide particles having high coercivity Hc used in the present embodiment will be described below. As epsilon iron oxide particles, it is hoped that the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

A recording method and a recording apparatus capable of easily recording information have been proposed even in a magnetic recording medium using ε iron oxide particles having high coercivity as a magnetic recording material. The recording device (10) of the present invention applies an external magnetic field (Ho) that inclines the magnetization (3) of the ε iron oxide particles to the particle dispersion (1) containing the ε iron oxide particles, and irradiates light ( L1). Thereby, the recording device (10) can reverse the magnetization (3) which cannot be reversed only by an external magnetic field due to the synergistic effect of the inclination of the magnetization (3) and the optical excitation of the magnetization (3).

Description

technical field [0001] The present invention relates to a recording method, a recording apparatus, a reproducing method, a reproducing apparatus, and a high-speed response element, and is suitably applied to a magnetic recording medium or the like using ε iron oxide particles. Background technique [0002] In magnetic recording media, miniaturization of magnetic particles is desired for high recording density, and in recent years, attention has been paid to magnetic recording media using ε iron oxide particles capable of miniaturizing magnetic particles. It is considered that the S / N ratio of the signal can be increased with the miniaturization of the magnetic particles. On the other hand, the thermal stability of the magnetization is proportional to the magnetic anisotropy constant and the particle volume, so the heat of the magnetization is lost due to the miniaturization. stability. [0003] Here, it is considered that the magnetic anisotropy constant can be raised by ra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/02G11B5/706H01F1/113
CPCH01F1/113G11B5/70642G11B5/02G11B5/706G11B5/012
Inventor 大越慎一中岛诚白田雅史堂下广昭
Owner THE UNIV OF TOKYO