JP2002074638A - Magnetic information recording medium - Google Patents

Magnetic information recording medium

Info

Publication number
JP2002074638A
JP2002074638A JP2000254045A JP2000254045A JP2002074638A JP 2002074638 A JP2002074638 A JP 2002074638A JP 2000254045 A JP2000254045 A JP 2000254045A JP 2000254045 A JP2000254045 A JP 2000254045A JP 2002074638 A JP2002074638 A JP 2002074638A
Authority
JP
Japan
Prior art keywords
layer
magnetic
magnetic layer
recording
recording medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000254045A
Other languages
Japanese (ja)
Inventor
Koji Matsumoto
幸治 松本
Kazuyuki Ozaki
一幸 尾崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP2000254045A priority Critical patent/JP2002074638A/en
Publication of JP2002074638A publication Critical patent/JP2002074638A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic information recording medium capable of reducing an increase of noise caused by magnetic fluctuation of a soft magnetic layer. SOLUTION: The magnetic information recording medium provided with a first magnetic layer having an easily-magnetized axis in the direction vertical to a film surface and recording information, a second magnetic layer having an easily-magnetized axis in the intra-surface direction to the film surface, a non-magnetic intermediate layer formed between the first and the second magnetic layers and a third magnetic layer having an easily-magnetized axis in the vertical or intra-surface direction to the film surface and exchange- coupled with the second magnetic layer, is characterized in that the third magnetic layer has a magnetization direction directed in one direction in at least the specific region where information is continuously reproduced.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、磁気情報記録媒体
に関する。更に詳しくは、本発明は、情報を磁気的に記
録及び再生するに際して、記録/再生特性を向上させた
情報記録媒体に関し、情報の記録再生を超高密度で行い
うる情報記録再生媒体を提供するものである。
[0001] The present invention relates to a magnetic information recording medium. More specifically, the present invention relates to an information recording medium having improved recording / reproducing characteristics when recording and reproducing information magnetically, and provides an information recording / reproducing medium capable of recording and reproducing information at an ultra high density. Things.

【0002】[0002]

【従来の技術】膜面に対して垂直方向に磁化容易軸を有
し情報を記録する磁性層(記録層とも言う)と軟磁性層
との積層体からなる磁気情報記録媒体が知られている。
この軟磁性層は、記録層への記録に用いられる磁束を集
中させる役割を有し、記録層単独の場合よりも記録再生
特性が向上することが知られている。軟磁性層を備えた
磁気情報記録媒体は、例えば、特開平6−28652号
公報や特開平10−214719号公報に報告されてい
る。具体的には、前者には、軟磁性層と記録層との間に
非磁性中間層を備えた構成が記載されており、非磁性中
間層は、軟磁性層に磁壁が発生することを抑制する役割
を有している。一方、後者には、軟磁性層と記録層とを
備え、軟磁性層に発生する磁壁の移動を抑制する固定層
を備えた構成が記載されている。
2. Description of the Related Art There is known a magnetic information recording medium comprising a laminate of a magnetic layer (also referred to as a recording layer) having an easy axis of magnetization perpendicular to a film surface for recording information and a soft magnetic layer. .
This soft magnetic layer has a role of concentrating the magnetic flux used for recording on the recording layer, and it is known that the recording / reproducing characteristics are improved as compared with the case where the recording layer is used alone. Magnetic information recording media having a soft magnetic layer are reported, for example, in JP-A-6-28652 and JP-A-10-214719. Specifically, the former describes a configuration in which a non-magnetic intermediate layer is provided between a soft magnetic layer and a recording layer, and the non-magnetic intermediate layer suppresses generation of domain walls in the soft magnetic layer. Have a role to do. On the other hand, the latter describes a configuration including a soft magnetic layer and a recording layer, and a fixed layer that suppresses movement of a domain wall generated in the soft magnetic layer.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記磁
気情報記録媒体においても、軟磁性層が非常に小さな磁
界で磁化状態が変化することにより、ノイズが生じてい
た。そこで、本発明は、この軟磁性層の磁化揺らぎによ
るノイズの上昇を低減しうる磁気情報記録媒体を提供す
るものである。
However, also in the above-mentioned magnetic information recording medium, noise is caused by the soft magnetic layer changing its magnetization state with a very small magnetic field. Accordingly, the present invention provides a magnetic information recording medium capable of reducing an increase in noise due to the fluctuation of magnetization of the soft magnetic layer.

【0004】[0004]

【課題を解決するための手段】かくして本発明によれ
ば、膜面に対して垂直方向に磁化容易軸を有し情報を記
録する第1磁性層と、膜面に対して面内方向に磁化容易
軸を有する第2磁性層と、第1磁性層と第2磁性層との
間に形成された非磁性中間層と、膜面に対して垂直方向
又は面内方向に磁化容易軸を有しかつ第2磁性層と交換
結合する第3磁性層とを備え、第3磁性層が、少なくと
も情報を連続して再生する特定の領域において、一方向
に向いた磁化方向を有することを特徴とする磁気情報記
録媒体が提供される。
Thus, according to the present invention, there is provided a first magnetic layer having an easy axis of magnetization perpendicular to a film surface for recording information, and a magnetization in an in-plane direction relative to the film surface. A second magnetic layer having an easy axis, a nonmagnetic intermediate layer formed between the first magnetic layer and the second magnetic layer, and an easy axis of magnetization in a direction perpendicular or in-plane to the film surface. And a third magnetic layer exchange-coupled with the second magnetic layer, wherein the third magnetic layer has a magnetization direction in one direction at least in a specific region where information is continuously reproduced. A magnetic information recording medium is provided.

【0005】[0005]

【発明の実施の形態】以下では、第1磁性層を記録層、
第2磁性層を軟磁性層、第3磁性層を固定層と称して、
本発明を説明する。まず、本発明の磁気情報記録媒体の
構成としては、以下の例が挙げられる。 (1)基板1/固定層2/軟磁性層3/非磁性中間層4
/記録層5(図1(a)参照) (2)基板1/軟磁性層3/固定層2/非磁性中間層4
/記録層5(図1(b)参照)
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, a first magnetic layer is a recording layer,
The second magnetic layer is called a soft magnetic layer, and the third magnetic layer is called a fixed layer.
The present invention will be described. First, examples of the configuration of the magnetic information recording medium of the present invention include the following. (1) Substrate 1 / fixed layer 2 / soft magnetic layer 3 / non-magnetic intermediate layer 4
/ Recording layer 5 (see FIG. 1A) (2) Substrate 1 / Soft magnetic layer 3 / Fixed layer 2 / Non-magnetic intermediate layer 4
/ Recording layer 5 (see FIG. 1B)

【0006】本発明では、上記のように軟磁性層と固定
層を磁気的に密着させた構成としているので、その間に
交換結合が働く。ゆえに、固定層の磁化により、軟磁性
層は一度特定方向に磁化されると容易にその磁化方向を
変えることがない。ただし、記録する際にヘッドから印
加される磁界に対しては、敏感に反応して記録磁界の磁
束の通りをよくする。しかし、記録後には、凍結された
軟磁性層の磁化は特定方向に向いた固定層の磁化に影響
されて動かない。このために軟磁性層由来のノイズを低
減できる。
In the present invention, since the soft magnetic layer and the fixed layer are magnetically adhered as described above, exchange coupling acts between them. Therefore, once the soft magnetic layer is magnetized in a specific direction by the magnetization of the fixed layer, the magnetization direction does not easily change. However, it responds sensitively to the magnetic field applied from the head during recording to improve the flow of the magnetic field of the recording magnetic field. However, after recording, the magnetization of the frozen soft magnetic layer does not move due to the influence of the magnetization of the fixed layer oriented in a specific direction. For this reason, noise derived from the soft magnetic layer can be reduced.

【0007】固定層は、膜面に対して垂直方向に磁化容
易軸を有する垂直磁性層あるいは面内方向に容易軸を有
する反強磁性層を使用することができる。具体的には、
TbFeCoのような希土類遷移金属アモルファス合金
やCrMnのような多結晶合金からなる垂直磁性層、P
dMn、PtMn、NiMn、PdPtMn等からなる
反強磁性層が挙げられる。この内、希土類遷移金属アモ
ルファス合金や多結晶合金からなる垂直磁性層が好まし
く、特にTbFeCoが好ましい。
As the fixed layer, a perpendicular magnetic layer having an easy axis of magnetization perpendicular to the film surface or an antiferromagnetic layer having an easy axis of in-plane direction can be used. In particular,
A perpendicular magnetic layer made of a rare earth transition metal amorphous alloy such as TbFeCo or a polycrystalline alloy such as CrMn;
Examples include an antiferromagnetic layer made of dMn, PtMn, NiMn, PdPtMn, or the like. Of these, a perpendicular magnetic layer made of a rare earth transition metal amorphous alloy or a polycrystalline alloy is preferable, and TbFeCo is particularly preferable.

【0008】また、固定層は、軟磁性層由来のノイズを
低減するために保磁力が大きいことが好ましい。具体的
には、保磁力は、5kOe以上であることが好ましく、
10kOe以上であることがより好ましい。ここで、固
定層にTbFeCoを使用する場合、Tbの量を18〜
27atom%とすることで、5kOe以上の保磁力を
実現することができる。なお、固定層を構成する材料の
組成は、保磁力が無限大となる補償組成であることがよ
り好ましい。
It is preferable that the fixed layer has a large coercive force in order to reduce noise derived from the soft magnetic layer. Specifically, the coercive force is preferably 5 kOe or more,
More preferably, it is 10 kOe or more. Here, when TbFeCo is used for the fixed layer, the amount of Tb is 18 to
By setting it to 27 atom%, a coercive force of 5 kOe or more can be realized. Note that the composition of the material forming the fixed layer is more preferably a compensating composition in which the coercive force becomes infinite.

【0009】更に、固定層の厚さは、この層を構成する
材料の種類によっても相違するが、例えば、TbFeC
oを使用する場合、30〜60nmであることが好まし
い。軟磁性層は、膜面に対して面内方向に磁化容易軸を
有する磁性層である。軟磁性層を構成する材料は、特に
限定されず、公知の材料を使用することができる。具体
的には、FeTaC、NiFe等が挙げられる。この
内、FeTaCが好ましい。また、軟磁性層の厚さは、
この層を構成する材料の種類によっても相違するが、例
えば、FeTaCを使用する場合、200〜500nm
であることが好ましい。
Further, the thickness of the fixed layer varies depending on the type of the material constituting the fixed layer.
When o is used, it is preferably 30 to 60 nm. The soft magnetic layer is a magnetic layer having an easy axis of magnetization in an in-plane direction with respect to the film surface. The material constituting the soft magnetic layer is not particularly limited, and a known material can be used. Specifically, FeTaC, NiFe and the like can be mentioned. Of these, FeTaC is preferred. Also, the thickness of the soft magnetic layer is
Although it differs depending on the type of material constituting this layer, for example, when using FeTaC, 200 to 500 nm
It is preferred that

【0010】記録層は、膜面に対して垂直方向に磁化容
易軸を有する磁性層である。軟磁性層を構成する材料
は、特に限定されず、公知の材料を使用することができ
る。具体的には、TbFeCo、GdFeCo、TbD
yFeCo、TbGdFeCo、DyGdFeCo等の
希土類遷移金属アモルファス合金が挙げられる。また、
記録層は、磁気ヘッドで記録するために、保磁力が小さ
いことが好ましい。具体的には、保磁力は、5kOe以
下であることが好ましい。ここで、記録層にTbFeC
oを使用する場合、Tbの量を14〜18atom%と
することで、5kOe以下の保磁力を実現することがで
きる。但し、保磁力は記録層の製造条件によっても変化
するため、Tbの量よりも、保磁力の値を基準とするこ
とが好ましい。
[0010] The recording layer is a magnetic layer having an easy axis of magnetization perpendicular to the film surface. The material constituting the soft magnetic layer is not particularly limited, and a known material can be used. Specifically, TbFeCo, GdFeCo, TbD
Rare earth transition metal amorphous alloys such as yFeCo, TbGdFeCo, and DyGdFeCo can be used. Also,
The recording layer preferably has a small coercive force for recording with a magnetic head. Specifically, the coercive force is preferably 5 kOe or less. Here, TbFeC is used for the recording layer.
When o is used, a coercive force of 5 kOe or less can be realized by setting the amount of Tb to 14 to 18 atom%. However, since the coercive force changes depending on the manufacturing conditions of the recording layer, it is preferable to use the value of the coercive force as a reference rather than the amount of Tb.

【0011】更に、記録層の厚さは、この層を構成する
材料の種類によっても相違するが、例えば、TbFeC
oを使用する場合、10〜30nmであることが好まし
い。なお、記録層は2層以上の積層体からなっていても
よい。例えば、TbFeCo層とGdFeCo層の積層
体が挙げられる。より具体的には、TbFeCo層(層
厚20nm、保磁力5kOe(140emu/cc))
とGdFeCo層(層厚10nm、保磁力100Oe
(300emu/cc))を交換結合させた記録層を使
用することができる。この場合、GdFeCo層を記録
再生用磁気ヘッド側に位置させることが好ましい。
Further, the thickness of the recording layer differs depending on the type of material constituting the layer.
When o is used, the thickness is preferably 10 to 30 nm. The recording layer may be composed of a laminate of two or more layers. For example, a laminate of a TbFeCo layer and a GdFeCo layer can be given. More specifically, a TbFeCo layer (layer thickness: 20 nm, coercive force: 5 kOe (140 emu / cc))
And a GdFeCo layer (layer thickness 10 nm, coercive force 100 Oe
(300 emu / cc)) can be used. In this case, it is preferable to position the GdFeCo layer on the recording / reproducing magnetic head side.

【0012】非磁性中間層は、特に限定されず、SiN
層のような当該分野で公知の材料からなる層を使用する
ことができる。この層の厚さは、特に限定されないが、
5〜50nmであることが好ましい。上記固定層、軟磁
性層、非磁性中間層及び記録層は、スパッタ法のような
公知の方法で所定の厚さに形成することができる。
The non-magnetic intermediate layer is not particularly limited.
Layers of materials known in the art, such as layers, can be used. The thickness of this layer is not particularly limited,
Preferably it is 5 to 50 nm. The fixed layer, soft magnetic layer, non-magnetic intermediate layer and recording layer can be formed to a predetermined thickness by a known method such as a sputtering method.

【0013】本発明の磁気情報記録媒体は、通常基板上
に上記各層が形成されている。基板としては、プラスチ
ック基板、シリコン基板等の当該分野で通常使用される
基板をいずれも使用することができる。もちろん、基板
と基板に接する磁性層(固定層又は軟磁性層)の間に
は、Cr層、SiN層、SiO2層といった密着層が形
成されていてもよい。また、記録層上にC層、SiN
層、SiO2層、Y−SiO2層等の保護層が形成されて
いてもよく、さらには保護層はC/SiN等の積層体で
あってもよい。
The magnetic information recording medium of the present invention usually has the above-mentioned layers formed on a substrate. As the substrate, any substrate commonly used in this field, such as a plastic substrate or a silicon substrate, can be used. Of course, an adhesion layer such as a Cr layer, a SiN layer, or a SiO 2 layer may be formed between the substrate and the magnetic layer (fixed layer or soft magnetic layer) in contact with the substrate. In addition, a C layer, SiN
A protective layer such as a layer, a SiO 2 layer, and a Y-SiO 2 layer may be formed, and the protective layer may be a laminate of C / SiN or the like.

【0014】本発明の磁気情報記録媒体は、磁気により
情報を記録及び再生する方法であれば、いずれの記録再
生方法にも使用することができる。例えば、情報を室温
で磁気的に記録再生する方法や、情報を光を照射して加
熱しつつ磁気的に記録再生する方法が挙げられる。ま
た、本発明の磁気情報記録媒体は、記録再生方法に適合
した公知の記録再生装置で記録再生することができる。
The magnetic information recording medium of the present invention can be used for any recording / reproducing method as long as it records and reproduces information by magnetism. For example, a method of magnetically recording and reproducing information at room temperature, and a method of magnetically recording and reproducing information while irradiating the information with light and heating the same. Further, the magnetic information recording medium of the present invention can be recorded and reproduced by a known recording and reproducing apparatus suitable for a recording and reproducing method.

【0015】[0015]

【実施例】実施例1 ここでは、垂直磁気異方性を示す希土類遷移金属を主成
分とするアモルファス合金からなる記録層とFeTaC
からなる軟磁性層および、室温でHcが非常に大きくな
る希土類遷移金属アモルファス合金からなる固定層を用
い、非磁性中間層としては、SiN層を用いた。基板に
は通常の2.5インチガラス基板を用いた。磁性層の製
膜は通常のDCマグネトロンスパッタ装置を用いた。磁
性層のスパッタにはArガスを用い、SiNのスパッタ
にはAr+N2ガスを用いた。
EXAMPLE 1 Here, a recording layer made of an amorphous alloy mainly composed of a rare earth transition metal exhibiting perpendicular magnetic anisotropy and a FeTaC
And a fixed layer made of a rare earth transition metal amorphous alloy whose Hc becomes very large at room temperature. A SiN layer was used as the nonmagnetic intermediate layer. An ordinary 2.5-inch glass substrate was used as the substrate. An ordinary DC magnetron sputtering apparatus was used for forming the magnetic layer. Ar gas was used for sputtering the magnetic layer, and Ar + N 2 gas was used for sputtering SiN.

【0016】ターゲットとしては以下のものを用いた。
なお、各層を構成する合金層中の元素記号の後の数値は
atom%を意味する 固定層:Tb22Fe48Co30 (Hc=15kOe 層厚50nm Ms=10emu
/cc) 記録層:Tb19Fe71Co10 (Hc=3.8kOe 層厚:20nm Ms=150
emu/cc) 軟磁性層:Fe80Ta10C10 (層厚:400nm Ms=1200emu/cc) 非磁性中間層:SiN 上記各層を以下のように積層した。 基板/SiN(10nm)/Tb22Fe48Co30
(50nm)/Fe80Ta10C10(400nm)
/SiN(10nm)/Tb19Fe71Co10(2
0nm)/SiN(8nm)/C(2nm)
The following were used as targets.
The numerical value after the element symbol in the alloy layer constituting each layer means atom%. Fixed layer: Tb22Fe48Co30 (Hc = 15 kOe, layer thickness 50 nm, Ms = 10 emu)
/ Cc) Recording layer: Tb19Fe71Co10 (Hc = 3.8 kOe) Layer thickness: 20 nm Ms = 150
emu / cc) Soft magnetic layer: Fe80Ta10C10 (layer thickness: 400 nm Ms = 1200 emu / cc) Nonmagnetic intermediate layer: SiN Each of the above layers was laminated as follows. Substrate / SiN (10 nm) / Tb22Fe48Co30
(50 nm) / Fe80Ta10C10 (400 nm)
/ SiN (10 nm) / Tb19Fe71Co10 (2
0 nm) / SiN (8 nm) / C (2 nm)

【0017】この磁気情報記録媒体の270kFCIに
おけるSNRの変化を調べた。ここでは、記録再生ヘッ
ドには、磁気情報記録媒体において、面内記録用に使用
されているマージ型ヘッド(薄膜インダクティブ記録素
子+GMR再生素子)を用いた。記録コア幅は0.6μ
m、再生コア幅は0.5μm、再生シールド間隔は0.
12μmとした。なお、記録前に媒体を強力な磁石を通
過させて、固定層の磁化を特定方向に揃えておいた。上
記媒体のSNRは22dBであった。比較のために、固
定層を設けないこと以外は上記と同様の構成の磁気情報
記録媒体を作成し、そのSNRを測定したところ、19
dBと小さくなっていた。この理由は、再生信号の大き
さには変化はないが、ノイズが約1.5倍になったため
である。
The change in SNR of the magnetic information recording medium at 270 kFCI was examined. Here, as the recording / reproducing head, a merge type head (thin film inductive recording element + GMR reproducing element) used for in-plane recording in a magnetic information recording medium was used. Recording core width is 0.6μ
m, the reproducing core width is 0.5 μm, and the reproducing shield interval is 0.5 μm.
It was 12 μm. Before recording, the medium was passed through a strong magnet so that the magnetization of the fixed layer was aligned in a specific direction. The SNR of the medium was 22 dB. For comparison, a magnetic information recording medium having the same configuration as above except that no fixed layer was provided was prepared, and its SNR was measured.
It had been reduced to dB. The reason for this is that the magnitude of the reproduced signal does not change, but the noise is increased about 1.5 times.

【0018】実施例2 次に固定層の位置を変えた媒体のSNRを測定した。 基板/SiN(10nm)/Fe80Ta10C10
(400nm)/Tb22Fe48co80(50n
m)/SiN(10nm)/Tb19Fe71Co10
(20nm)/SiN(8nm)/C(2nm) 磁気特性や製膜条件は実施例1と同一とした。この場
合、固定層のMsが小さいことから、記録層と固定層の
静磁気的なカップリングが小さく、記録と再生の両方と
もに悪影響を与えることはない。また、実施例1と同様
な測定をしたところ、SNR=22.3dBという良好
な値を示した。
Example 2 Next, the SNR of the medium in which the position of the fixed layer was changed was measured. Substrate / SiN (10 nm) / Fe80Ta10C10
(400 nm) / Tb22Fe48co80 (50 n
m) / SiN (10 nm) / Tb19Fe71Co10
(20 nm) / SiN (8 nm) / C (2 nm) The magnetic properties and film forming conditions were the same as in Example 1. In this case, since Ms of the fixed layer is small, the magnetostatic coupling between the recording layer and the fixed layer is small, and there is no adverse effect on both recording and reproduction. The same measurement as in Example 1 showed a good value of SNR = 22.3 dB.

【0019】実施例3 次に、固定層の組成を変えることで保磁力を変化させた
場合のSNRを実施例1と同様に測定した。希土類遷移
金属アモルファス合金層は組成を変えれば様々な保磁力
を得られるので、保磁力に対するSNRを示す。 固定層Hc(kOe) 5 10 13 15 20 25 SNR(dB) 21.4 21.6 21.8 22 22.4 22.4 このように固定層のHcを大きくすることでSNRを高
めることが可能であることが分かった。また、Hcが1
0kOe以上であれば、よりよいSNRが得られること
が分かった。
Example 3 Next, the SNR when the coercive force was changed by changing the composition of the fixed layer was measured in the same manner as in Example 1. Since various coercive forces can be obtained by changing the composition of the rare earth transition metal amorphous alloy layer, the SNR with respect to the coercive force is shown. Fixed layer Hc (kOe) 5 10 13 15 20 25 SNR (dB) 21.4 21.6 21.8 22 22.4 22.4 It was found that the SNR can be increased by increasing the Hc of the fixed layer. Also, Hc is 1
It has been found that a better SNR can be obtained if 0 kOe or more.

【0020】実施例4 ここでは、固定層として多結晶性のCr60Mn40を
用いた。製膜は特に加熱することなく行った。この固定
層を使用することで、その上に形成される層の配向性を
向上させることができた。 基板/SiN(10nm)/Cr50Mo50(10n
m)/Cr60Mn40(40nm)/Fe80Ta1
0C10(400nm)/SiN(10nm)/Tb2
2Fe48Co30(20nm)/SiN(8nm)/
C(2nm) この媒体のSNRを実施例1と同様な方法で測定したと
ころ、SNR=22.1dBとなり、固定層に垂直磁化
層を用いた場合と同様な効果が得られることが分かっ
た。
Embodiment 4 Here, polycrystalline Cr60Mn40 was used as the fixed layer. The film was formed without heating. By using this fixed layer, the orientation of the layer formed thereon could be improved. Substrate / SiN (10 nm) / Cr50Mo50 (10n
m) / Cr60Mn40 (40 nm) / Fe80Ta1
0C10 (400 nm) / SiN (10 nm) / Tb2
2Fe48Co30 (20 nm) / SiN (8 nm) /
C (2 nm) The SNR of this medium was measured by the same method as in Example 1. As a result, SNR was 22.1 dB, and it was found that the same effect as when the perpendicular magnetization layer was used as the fixed layer was obtained.

【0021】実施例5 ここでは、垂直磁気異方性を示す希土類遷移金属を主成
分とするアモルファス合金からなる記録層と、FeTa
Cからなる軟磁性層と、室温でHcが大きくなる希土類
遷移金属アモルファス合金からなる固定層を用い、非磁
性中間層を用いない場合を調べた。基板には通常の2.
5インチガラス基板を用いた。磁性層の製膜は通常のD
Cマグネトロンスパッタ装置を用いた。磁性層のスパッ
タにはArガスを用い、SiNのスパッタにはAr+N
2ガスを用いた。ターゲットとしては以下のものを用い
た。 固定層:Tb22Fe48Co30 (Hc=15kOe 層厚50nm Ms=10emu
/cc) 記録層:Tb19Fe71Co10 (Hc=3.8kOe 層厚:20nm Ms=150
emu/cc) 軟磁性層:Fe80Ta10C10 (層厚:400nm Ms=1200emu/cc) 上記各層を以下のように積層した。 基板/SiN(10nm)/Tb22Fe48Co30
(50nm)/Fe80Ta10C10(400nm)
/Tb19Fe71Co10(20nm)/SiN(8
nm)/C(2nm) この磁気情報記録媒体の270kFCIにおけるSNR
の変化を調べた。
Example 5 Here, a recording layer made of an amorphous alloy mainly composed of a rare earth transition metal exhibiting perpendicular magnetic anisotropy,
A case was examined in which a soft magnetic layer made of C and a fixed layer made of a rare earth transition metal amorphous alloy whose Hc increased at room temperature were used, and a nonmagnetic intermediate layer was not used. The substrate has the usual 2.
A 5-inch glass substrate was used. The formation of the magnetic layer is carried out by the usual
A C magnetron sputtering device was used. Ar gas is used for sputtering of the magnetic layer, and Ar + N is used for sputtering of SiN.
Two gases were used. The following were used as targets. Fixed layer: Tb22Fe48Co30 (Hc = 15 kOe, layer thickness 50 nm, Ms = 10 emu)
/ Cc) Recording layer: Tb19Fe71Co10 (Hc = 3.8 kOe) Layer thickness: 20 nm Ms = 150
emu / cc) Soft magnetic layer: Fe80Ta10C10 (layer thickness: 400 nm Ms = 1200 emu / cc) The above layers were laminated as follows. Substrate / SiN (10 nm) / Tb22Fe48Co30
(50 nm) / Fe80Ta10C10 (400 nm)
/ Tb19Fe71Co10 (20 nm) / SiN (8
nm) / C (2 nm) SNR of this magnetic information recording medium at 270 kFCI
Was examined for changes.

【0022】ここでは、記録再生ヘッドには、磁気情報
記録媒体において、面内記録用に使用されているマージ
型ヘッド(薄膜インダクティブ記録素子+GMR再生素
子)を用いた。記録コア幅は0.6μm、再生コア幅は
0.5μm、再生シールド間隔は0.12μmとした。
上記媒体のSNRは17dBであった。
Here, as the recording / reproducing head, a merge type head (thin-film inductive recording element + GMR reproducing element) used for in-plane recording in a magnetic information recording medium was used. The recording core width was 0.6 μm, the reproducing core width was 0.5 μm, and the reproducing shield interval was 0.12 μm.
The SNR of the medium was 17 dB.

【0023】また、固定層の層厚を変化させること以外
は、上記と同様の構成の磁気情報記録媒体を作成し、そ
のSNRを測定した。 固定層の層厚(nm) 0 5 10 15 20 30 40 80 SNR(dB) 17 17.5 22 22.5 23.1 23.3 23.3 23.2 更に、比較のために、固定層を設けないこと以外は上記
と同様の構成の磁気情報記録媒体を作成し、そのSNR
を測定したところ、15dBであった。以上から、非磁
性中間層と固定層の両方を備えることが重要であること
がわかった。
Further, a magnetic information recording medium having the same configuration as that described above except that the thickness of the fixed layer was changed was prepared, and its SNR was measured. Layer thickness of fixed layer (nm) 0 5 10 15 20 30 40 80 SNR (dB) 17 17.5 22 22.5 23.1 23.3 23.3 23.2 For comparison, a magnet having the same configuration as above except that no fixed layer is provided. Create an information recording medium and use its SNR
Was 15 dB. From the above, it was found that it was important to provide both the nonmagnetic intermediate layer and the fixed layer.

【0024】[0024]

【発明の効果】本発明により、軟磁性層を備えた磁気情
報記録媒体において、軟磁性層由来のノイズの低減が可
能となり高SNRを実現できるので、超高密度記録が可
能となる。
According to the present invention, in a magnetic information recording medium having a soft magnetic layer, noise derived from the soft magnetic layer can be reduced and a high SNR can be realized, so that ultra-high density recording can be performed.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の磁気情報記録媒体の概略構成図であ
る。
FIG. 1 is a schematic configuration diagram of a magnetic information recording medium of the present invention.

【符号の説明】[Explanation of symbols]

1 基板 2 固定層 3 軟磁性層 4 非磁性中間層 5 記録層 DESCRIPTION OF SYMBOLS 1 Substrate 2 Fixed layer 3 Soft magnetic layer 4 Nonmagnetic intermediate layer 5 Recording layer

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 膜面に対して垂直方向に磁化容易軸を有
し情報を記録する第1磁性層と、膜面に対して面内方向
に磁化容易軸を有する第2磁性層と、第1磁性層と第2
磁性層との間に形成された非磁性中間層と、膜面に対し
て垂直方向又は面内方向に磁化容易軸を有しかつ第2磁
性層と交換結合する第3磁性層とを備え、第3磁性層
が、少なくとも情報を連続して再生する特定の領域にお
いて、一方向に向いた磁化方向を有することを特徴とす
る磁気情報記録媒体。
A first magnetic layer having an easy axis of magnetization in a direction perpendicular to a film surface and recording information; a second magnetic layer having an easy axis of magnetization in an in-plane direction with respect to the film surface; 1st magnetic layer and 2nd
A nonmagnetic intermediate layer formed between the magnetic layer and a third magnetic layer having an easy axis of magnetization in a direction perpendicular or in-plane to the film surface and exchange-coupled to the second magnetic layer; A magnetic information recording medium characterized in that the third magnetic layer has a magnetization direction oriented in one direction at least in a specific area where information is continuously reproduced.
【請求項2】 第2磁性層が、第3磁性層と非磁性中間
層との間に位置する請求項1に記載の磁気情報記録媒
体。
2. The magnetic information recording medium according to claim 1, wherein the second magnetic layer is located between the third magnetic layer and the non-magnetic intermediate layer.
【請求項3】 第3磁性層が、希土類遷移金属アモルフ
ァス合金層からなる請求項1又は2に記載の磁気情報記
録媒体。
3. The magnetic information recording medium according to claim 1, wherein the third magnetic layer comprises a rare earth transition metal amorphous alloy layer.
JP2000254045A 2000-08-24 2000-08-24 Magnetic information recording medium Pending JP2002074638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000254045A JP2002074638A (en) 2000-08-24 2000-08-24 Magnetic information recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000254045A JP2002074638A (en) 2000-08-24 2000-08-24 Magnetic information recording medium

Publications (1)

Publication Number Publication Date
JP2002074638A true JP2002074638A (en) 2002-03-15

Family

ID=18743059

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000254045A Pending JP2002074638A (en) 2000-08-24 2000-08-24 Magnetic information recording medium

Country Status (1)

Country Link
JP (1) JP2002074638A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007299453A (en) * 2006-04-28 2007-11-15 Fujitsu Ltd Magnetic recording medium, its manufacturing method, and magnetic recording device
US7348077B2 (en) 2003-09-02 2008-03-25 Hitachi Maxwell Ltd Magnetic recording medium and magnetic recording apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0528453A (en) * 1991-07-16 1993-02-05 Fujitsu Ltd Perpendicular magnetic recording medium
JPH07129946A (en) * 1993-09-13 1995-05-19 Victor Co Of Japan Ltd Perpendicular magnetic recording medium
JPH10214719A (en) * 1997-01-29 1998-08-11 Fujitsu Ltd Vertical magnetic recording medium and manufacture thereof
JP2000315311A (en) * 1999-05-06 2000-11-14 Hitachi Ltd Vertical magnetic recording medium and magnetic storage device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0528453A (en) * 1991-07-16 1993-02-05 Fujitsu Ltd Perpendicular magnetic recording medium
JPH07129946A (en) * 1993-09-13 1995-05-19 Victor Co Of Japan Ltd Perpendicular magnetic recording medium
JPH10214719A (en) * 1997-01-29 1998-08-11 Fujitsu Ltd Vertical magnetic recording medium and manufacture thereof
JP2000315311A (en) * 1999-05-06 2000-11-14 Hitachi Ltd Vertical magnetic recording medium and magnetic storage device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7348077B2 (en) 2003-09-02 2008-03-25 Hitachi Maxwell Ltd Magnetic recording medium and magnetic recording apparatus
JP2007299453A (en) * 2006-04-28 2007-11-15 Fujitsu Ltd Magnetic recording medium, its manufacturing method, and magnetic recording device

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