MAGNETO-OPTICAL RECORDING MEDIUM, ITS REPRODUCING METHOD AND REPRODUCER

Title:

MAGNETO-OPTICAL RECORDING MEDIUM, ITS REPRODUCING METHOD AND REPRODUCER

Document Type and Number:

WIPO Patent Application WO/1998/002877

Kind Code:

A1

Abstract:

A magneto-optical recording medium (11) has a second auxiliary magnetic film (4), a first auxiliary magnetic film (5) and a magneto-optical recording film (6) in this order from the laser beam applied side. If the temperatures of the first and second auxiliary magnetic films (4 and 5) exceed their critical temperatures T�CR1? and T�CR2?, the magnetization of the auxiliary magnetic films is changed from the surface magnetization to the vertical magnetization. The Curie points T�C0?, T�C1? and T�C2? of the magneto-optical recording film (6), the first auxiliary magnetic film (4) and the second auxiliary magnetic film (5) and the critical temperatures T�CR1? and T�CR2? satisfy the relations room temperature < T�CR2? < T�CR1? < T�C0?, T�C1? and T�C2?. The thickness of the first auxiliary magnetic film (4) is larger than the tickness of a magnetic wall. After the recording magnetic domain (22) of the magneto-optical recording film (6) is contracted and transferred onto the first auxiliary magnetic film (4) by the reproducing light application, it is expanded and transferred onto the second auxiliary magnetic film (5). Since an amplified reproducing signal can be obtained from an expanded magnetic domain (23), the magneto-optical recording medium is suitable for the reproduction of the high density recording.

Inventors:

OONUKI SATORU (JP)
YOSHIHIRO MASAFUMI (JP)
NAGAI NOBUYUKI (JP)
SHIMAZAKI KATSUSUKE (JP)
AWANO HIROYUKI (JP)
SHIRAI HIROSHI (JP)
OHTA NORIO (JP)
SUMI SATOSHI (JP)
YAMAGUCHI ATSUSHI (JP)

Application Number:

PCT/JP1997/002419

Publication Date:

January 22, 1998

Filing Date:

July 11, 1997

Export Citation:

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Assignee:

HITACHI MAXELL (JP)
SANYO ELECTRIC CO (JP)
OONUKI SATORU (JP)
YOSHIHIRO MASAFUMI (JP)
NAGAI NOBUYUKI (JP)
SHIMAZAKI KATSUSUKE (JP)
AWANO HIROYUKI (JP)
SHIRAI HIROSHI (JP)
OHTA NORIO (JP)
SUMI SATOSHI (JP)
YAMAGUCHI ATSUSHI (JP)

International Classes:

G11B11/10; G11B11/105; G11B27/19; G11B27/30; G11B7/007; (IPC1-7): G11B11/10

Foreign References:

JPH06295479A	1994-10-21
JPH02235234A	1990-09-18
JPH09138982A	1997-05-27
JPH04325948A	1992-11-16
JPH0981979A	1997-03-28
JPH08161788A	1996-06-21
JPH0773519A	1995-03-17
JPH0737283A	1995-02-07
JPH03203051A	1991-09-04

Other References: