US 5,210,724 A · Optomagnetic recording method and apparatus which precludes an interface magnetic wall within block magnetic wall

Abstract

An information recording method, which performs recording of an information by use of an optical magnetic recording medium provided with a first magnetic layer and a second magnetic layer having higher Curie point and lower coercive force at room temperature than the first magnetic layer, by carrying out initialization to align the magnetization direction of the second magnetic layer in one direction and then irradiating an optical beam of which power has received modulation between the two values which are not zero depending on the information, thereby recording the information as the arrangement of a magnetic domain on the above medium, has characteristic such that, when initialized again after recording of the above information, an interface magnetic wall is permitted to exist between said first and second magnetic layers at the portion other than said magnetic domain.

Claims10

Dependent claims

A method of magneto-optical recording information comprising the steps of:

using an optical-magnetic recording medium including a first magnetic layer and a second magnetic layer having a higher Curie point and lower coercive force at room temperature than that of said first magnetic layer;
initializing said medium to align the magnetization direction of said second magnetic layer in one direction;
irradiating said medium with an optical beam that is modulated with information to be recorded on the medium between two non-zero values, to thereby record the information in the form of magnetic domains onto the medium;
and
re-initializing after said recording of said information, wherein the medium is formed in such a way that during said re-initializing:
(i) no interface magnetic wall exists between said first and second magnetic layers inside each of said magnetic domains which is surrounded by Bloch magnetic walls, and (ii) an interface magnetic wall exists between said first and second magnetic layers at portions other than said recorded magnetic domains.

3 more elements

A method of magneto-optical recording information comprising the steps of:

using an optical magnetic recording medium comprising a first magnetic layer and a second magnetic layer, said second magnetic layer having a higher Curie point and a lower coercive force at room temperature than said first magnetic layer;
initializing said medium to align the magnetization direction of said second magnetic layer in one direction;
and
irradiating said medium with an optical beam that is modulated with information to be recorded on the medium between two non-zero values, to thereby record the information in the form of magnetic domains onto the medium, whereby when the recording medium is reinitialized after said recording of information, the medium is formed in such a way that during said reinitializing:
(i) no interface magnetic wall will exist between said first and second magnetic layers inside each of said magnetic domains which is surrounded by Bloch magnetic walls, and (ii) an interface magnetic wall will exist between said first and second magnetic layers at portions other than said recorded magnetic domains.

2 more elements

Dependencies are inferred from the claim text.

Optomagnetic recording method and apparatus which precludes an interface magnetic wall within block magnetic wall

Life of this patent

Optomagnetic recording method and apparatus which precludes an interface magnetic wall within block magnetic wall

Life of this patent

Abstract

Claims10