JP2514624B2 - Thin film magnetic head - Google Patents

Thin film magnetic head

Info

Publication number
JP2514624B2
JP2514624B2 JP60267537A JP26753785A JP2514624B2 JP 2514624 B2 JP2514624 B2 JP 2514624B2 JP 60267537 A JP60267537 A JP 60267537A JP 26753785 A JP26753785 A JP 26753785A JP 2514624 B2 JP2514624 B2 JP 2514624B2
Authority
JP
Japan
Prior art keywords
exciting coil
magnetic pole
magnetic head
thin film
film magnetic
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.)
Expired - Lifetime
Application number
JP60267537A
Other languages
Japanese (ja)
Other versions
JPS62128011A (en
Inventor
哲郎 三日月
順一 岸上
泰弘 越本
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP60267537A priority Critical patent/JP2514624B2/en
Publication of JPS62128011A publication Critical patent/JPS62128011A/en
Application granted granted Critical
Publication of JP2514624B2 publication Critical patent/JP2514624B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109—Details
    • G11B5/313—Disposition of layers
    • G11B5/3133—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は励磁電流による温度上昇を少なくし、大電流
動作を可能にした薄膜磁気ヘッドに関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a thin film magnetic head capable of operating at a large current by reducing a temperature rise due to an exciting current.

〈従来の技術とその問題点〉 第４図に従来の薄膜磁気ヘッドの構成例を示す。１は
励磁コイル、２は下部磁極、３は上磁極、４は絶縁層、
５は下地保護層、６は上部保護層、７は基板、８はラン
ドを示す。このヘッドの機能は、励磁コイル１に励磁電
流を流して、ギャップ部に記録磁界を発生させ、その付
近に置かれた磁気記録媒体に信号を記録するものであ
る。この場合、一般に媒体上の単位長さ当りに書き込ま
れる情報の量（記録密度）を増加させるためには、媒体
の保磁力を大きくすることが有効であることが知られて
おり、記録密度の向上のために保磁力の大きな媒体が使
用される傾向にある。そして、この保磁力の増加に伴い
磁気ヘッドの発生する磁界を増加させる為に、より高い
励磁電流を流す必要がある。<Prior Art and Its Problems> FIG. 4 shows an example of the configuration of a conventional thin film magnetic head. 1 is an exciting coil, 2 is a lower magnetic pole, 3 is an upper magnetic pole, 4 is an insulating layer,
Reference numeral 5 is a base protective layer, 6 is an upper protective layer, 7 is a substrate, and 8 is a land. The function of this head is to supply an exciting current to the exciting coil 1 to generate a recording magnetic field in the gap portion and record a signal on the magnetic recording medium placed in the vicinity thereof. In this case, it is generally known that increasing the coercive force of the medium is effective for increasing the amount of information (recording density) written per unit length on the medium. A medium having a large coercive force tends to be used for improvement. Then, in order to increase the magnetic field generated by the magnetic head as the coercive force increases, it is necessary to flow a higher exciting current.

また、薄膜磁気ヘッドを、より高い周波数で使用する
ため、その巻線数を少なくし、インダクタンスを小さく
する方向にあるが、巻線数の減少は、記録に必要な励磁
電流の増加をもたらす。Further, since the thin-film magnetic head is used at a higher frequency, the number of windings is reduced and the inductance is reduced. However, the reduction in the number of windings increases the exciting current required for recording.

このような励磁電流の増加により温度上昇が生じるの
であるが、薄膜磁気ヘッドにおいて励磁電流により発生
するジュール熱は第５図に示すように絶縁層４、下部磁
極２、下地保護層５を通り熱容量の大きな基板７に流れ
る。ところが、一般に、絶縁層４としては、金属より熱
伝導度の小さなレジストなどの有機物やSiO2等の材料に
より構成されるため、励磁コイル１に発生したジュール
熱の基板７への流れが疎外され、励磁コイル１や絶縁層
４の温度は高められ、この温度は概ね励磁電流に比例し
て増加する。そして、異種材料を積層して構成されてい
る薄膜ヘッドにおいてはその使用温度に自ずから制限が
あり、また、レジスト材は数百度で熱変形等を起こし薄
膜ヘッドの信頼性を低下させる。この結果、現在のヘッ
ドでは励磁電流が制限される欠点があった。Although the temperature rises due to such an increase in the exciting current, the Joule heat generated by the exciting current in the thin-film magnetic head passes through the insulating layer 4, the lower magnetic pole 2, and the underlying protective layer 5 as shown in FIG. Flowing over a large substrate 7. However, since the insulating layer 4 is generally made of an organic material such as a resist having a lower thermal conductivity than metal or a material such as SiO 2 , the flow of Joule heat generated in the exciting coil 1 to the substrate 7 is alienated. The temperature of the exciting coil 1 and the insulating layer 4 is raised, and this temperature increases substantially in proportion to the exciting current. Further, in a thin film head formed by laminating different kinds of materials, the operating temperature is naturally limited, and the resist material causes thermal deformation at several hundreds of degrees to deteriorate the reliability of the thin film head. As a result, the current head has a drawback that the exciting current is limited.

この欠点を改良する為に、励磁コイルの線幅を大きく
し、発生するジュール熱を減らす方法もあるが、励磁コ
イルの大きさが増加し、形状を小さくできる薄膜磁気ヘ
ッドの特徴も失われる。In order to improve this defect, there is also a method of increasing the line width of the exciting coil to reduce the generated Joule heat, but the size of the exciting coil is increased, and the characteristics of the thin film magnetic head that can reduce the shape are lost.

そこで本発明は励磁コイルに発生するジュール熱を基
板に効率良く排熱することにより、大電流動作を小形の
励磁コイルで可能とした、薄膜磁気ヘッドを提供するこ
とにある。Therefore, the present invention is to provide a thin film magnetic head capable of performing a large current operation with a small-sized exciting coil by efficiently discharging the Joule heat generated in the exciting coil to the substrate.

〈問題点を解決するための手段とその作用〉 本発明は、励磁コイルの外側部に放射状に凸部を形成
する、あるいは、熱的に励磁コイルに接続された金属片
を形成することを最も主要な特徴とする。これにより、
励磁コイルと基板との熱的対向面積を等価的に増大でき
るため、励磁コイルに発生したジュール熱を効率良く基
板に排熱することが可能であり、このため、従来より細
い線幅で大電流を流すことができる。<Means for Solving the Problem and Its Action> The present invention most preferably forms a radially convex portion on the outer side of the exciting coil, or forms a metal piece thermally connected to the exciting coil. The main feature. This allows
Since the thermal facing area between the exciting coil and the substrate can be increased equivalently, the Joule heat generated in the exciting coil can be efficiently exhausted to the substrate. Can be drained.

〈実施例〉 ［実施例１］ 第１図は本発明の第一の実施例を示すヘッドであっ
て、１は励磁コイル、２は下部磁極、３は上磁極、４は
絶縁層、５は下地保護層、６は上部保護層、７は基板、
８はランド、９は放熱ランドを示す。この放熱ランド９
は励磁コイルとつながり、その周辺にて放熱面積をとる
よう板状に広がった金属凸部で、放射状に溝が形成され
ている。そして、この放熱ランド９を設けることによ
り、従来の薄膜ヘッドでは励起コイル１の下部のみから
排熱されていたのに対し、本薄膜磁気ヘッドにおいては
通電のためのコイルとは別の放熱ランド９自体からも排
熱されるため、温度上昇をかなり少なくすることがで
き、放熱性を極めて向上することができる。この場合、
放熱ランドを含めた励磁コイル形状は大きくなるが、通
電に寄与するコイル形状は従来と同じであるため、放熱
ランド９を設けたことによる電気的特性の劣化はほとん
ど無い。しかも、本実施例では放熱ランドに放射状の切
り欠きをもうけることにより電気的特性の劣下をさらに
低減できる。<Embodiment> [Embodiment 1] FIG. 1 is a head showing a first embodiment of the present invention, in which 1 is an exciting coil, 2 is a lower magnetic pole, 3 is an upper magnetic pole, 4 is an insulating layer, and 5 is an insulating layer. A base protective layer, 6 an upper protective layer, 7 a substrate,
8 is a land and 9 is a heat dissipation land. This heat dissipation land 9
Is a metal convex portion which is connected to the exciting coil and spreads in a plate shape so as to have a heat radiation area around the exciting coil, and grooves are radially formed. By providing this heat dissipation land 9, heat is exhausted from only the lower part of the excitation coil 1 in the conventional thin film head, whereas in the present thin film magnetic head, a heat dissipation land 9 different from the coil for energization is provided. Since the heat is also exhausted from itself, the temperature rise can be considerably reduced and the heat dissipation can be greatly improved. in this case,
Although the shape of the exciting coil including the heat radiating land is large, the shape of the coil that contributes to energization is the same as the conventional one, and therefore the provision of the heat radiating land 9 causes almost no deterioration in electrical characteristics. Moreover, in the present embodiment, the radial cutouts are formed in the heat dissipation land to further reduce the deterioration of the electrical characteristics.

［実施例２］ 第２図は本発明の第二の実施例を示すヘッドであっ
て、１は励磁コイル、２は下部磁極、３は上磁極、４は
絶縁層、５は下地保護層、６は上部保護層、７は基板、
８はランド、10は放熱ランドである金属片を示す。この
金属片10は励磁コイル１の下側にあって下部磁極２と略
同一平面に板状に広がった構造を有する。そして、この
金属片を設けることにより、従来の薄膜磁気ヘッドでは
励磁コイル１の下部のみから排熱されていたのに対し、
本薄膜磁気ヘッドにおいては金属片の下部からも排熱さ
れるため、温度上昇を小さくすることが可能となる。こ
の場合、製造行程はわずかに複雑となるが、励磁コイル
１と金属片10とは熱的に接続されているが電気的には絶
縁されており、励磁コイル１の電気特性劣下は全く無
い。[Embodiment 2] FIG. 2 is a head showing a second embodiment of the present invention, in which 1 is an exciting coil, 2 is a lower magnetic pole, 3 is an upper magnetic pole, 4 is an insulating layer, 5 is a base protective layer, 6 is an upper protective layer, 7 is a substrate,
8 is a land and 10 is a metal piece which is a heat dissipation land. This metal piece 10 has a structure below the exciting coil 1 and spread in a plate shape in substantially the same plane as the lower magnetic pole 2. Further, by providing this metal piece, in the conventional thin film magnetic head, heat is exhausted only from the lower part of the exciting coil 1, whereas
In this thin-film magnetic head, heat is also exhausted from the lower part of the metal piece, so that the temperature rise can be reduced. In this case, the manufacturing process is slightly complicated, but the exciting coil 1 and the metal piece 10 are thermally connected but electrically insulated from each other, and there is no deterioration in the electrical characteristics of the exciting coil 1. .

［実施例３］ 第３図は本発明を螺旋状以外の形状の励磁コイル１に
適用した実施例を示すヘッドであって、１は励磁コイ
ル、２は下部磁極、３は上磁極、４は絶縁層、５は下地
保護層、６は上部保護層、７は基板、８はランド、９は
金属凸部である放熱ランドを示す。この励磁コイル１
は、ランド８間を上磁極３を立体的に囲むように結線し
てコイルとしたものであり、このコイルの両側平面に金
属凸部である放熱ランド９を有する。こうして本発明は
螺旋状以外の形状の励磁コイルに適用しても同様の効果
が得られる。[Embodiment 3] FIG. 3 is a head showing an embodiment in which the present invention is applied to an exciting coil 1 having a shape other than a spiral shape, in which 1 is an exciting coil, 2 is a lower magnetic pole, 3 is an upper magnetic pole, and 4 is An insulating layer, 5 is a base protective layer, 6 is an upper protective layer, 7 is a substrate, 8 is a land, and 9 is a heat dissipation land which is a metal convex portion. This exciting coil 1
Is a coil formed by connecting between the lands 8 so as to surround the upper magnetic pole 3 in a three-dimensional manner, and has heat radiating lands 9 that are metal protrusions on both side planes of the coil. Thus, the same effect can be obtained even when the present invention is applied to an exciting coil having a shape other than the spiral shape.

〈発明の効果〉 以上の如く金属片や凸部の形成により放熱面積が広く
なって排熱効率を上げることができ、大電流動作で小形
の励磁コイルを得ることができる。<Effects of the Invention> As described above, by forming the metal piece or the convex portion, the heat dissipation area can be widened and the heat exhaust efficiency can be improved, and a small exciting coil can be obtained by a large current operation.

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

第１図は本発明の第一の実施例の構造図、第２図は本発
明の第二の実施例の構造図、第３図は本発明の第三の実
施例の構造図、第４図は従来の薄膜磁気ヘッドの斜視
図、第５図はヘッド内の熱の流れの説明図である。 図中、 １…励磁コイル、２…下部磁極、３…上磁極、４…絶縁
層、５…下地保護層、６…上部保護層、７…基板、８…
ランド、９…放熱ランド、10…金属片である。1 is a structural diagram of a first embodiment of the present invention, FIG. 2 is a structural diagram of a second embodiment of the present invention, FIG. 3 is a structural diagram of a third embodiment of the present invention, and FIG. FIG. 5 is a perspective view of a conventional thin film magnetic head, and FIG. 5 is an explanatory diagram of heat flow in the head. In the figure, 1 ... Excitation coil, 2 ... Lower magnetic pole, 3 ... Upper magnetic pole, 4 ... Insulating layer, 5 ... Base protective layer, 6 ... Upper protective layer, 7 ... Substrate, 8 ...
Land, 9 ... Heat dissipation land, 10 ... Metal piece.

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】基板上に下部磁極、絶縁層、上部磁極を積
層し、上記下部磁極と上部磁極との間の上記絶縁層内に
励磁コイルが貫通する薄膜磁気ヘッドにおいて、 上記励磁コイルの途中にこの励磁コイルの一部を平面状
に拡張した放熱ランドである金属凸部を形成したことを
特徴とする薄膜磁気ヘッド。1. A thin film magnetic head in which a lower magnetic pole, an insulating layer, and an upper magnetic pole are laminated on a substrate, and the exciting coil penetrates into the insulating layer between the lower magnetic pole and the upper magnetic pole, in the middle of the exciting coil. A thin film magnetic head characterized in that a metal convex portion, which is a heat dissipation land, is formed by expanding a part of this exciting coil in a planar shape. 【請求項２】基板上に下部磁極、絶縁層、上部磁極を積
層し、上記下部磁極と上部磁極との間の上記絶縁層内に
励磁コイルが貫通する薄膜磁気ヘッドにおいて、 上記励磁コイルの途中にこの励磁コイルの一部を平面状
に拡張した放熱ランドである金属片を形成したことを特
徴とする薄膜磁気ヘッド。2. A thin-film magnetic head in which a lower magnetic pole, an insulating layer, and an upper magnetic pole are laminated on a substrate, and the exciting coil penetrates into the insulating layer between the lower magnetic pole and the upper magnetic pole, in the middle of the exciting coil. A thin-film magnetic head characterized in that a metal piece that is a heat-dissipating land is formed by planarizing a part of the exciting coil in a flat shape.
JP60267537A 1985-11-29 1985-11-29 Thin film magnetic head Expired - Lifetime JP2514624B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60267537A JP2514624B2 (en) 1985-11-29 1985-11-29 Thin film magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60267537A JP2514624B2 (en) 1985-11-29 1985-11-29 Thin film magnetic head

Publications (2)

Publication Number Publication Date
JPS62128011A JPS62128011A (en) 1987-06-10
JP2514624B2 true JP2514624B2 (en) 1996-07-10

Family

ID=17446199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60267537A Expired - Lifetime JP2514624B2 (en) 1985-11-29 1985-11-29 Thin film magnetic head

Country Status (1)

Country Link
JP (1) JP2514624B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8587900B2 (en) 2011-05-24 2013-11-19 HGST Netherlands B.V. Radiator-cooled nanowire-based write assist

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9001147A (en) * 1990-05-17 1991-12-16 Philips Nv THIN MOVIE MAGNETIC HEAD.
JP2002025006A (en) 2000-07-11 2002-01-25 Tdk Corp Thin film magnetic head and method for manufacturing the same
JP3942829B2 (en) * 2001-01-16 2007-07-11 Ｔｄｋ株式会社 Thin film magnetic head, magnetic head device, and magnetic disk device
JP2003045007A (en) 2001-07-26 2003-02-14 Fujitsu Ltd Magnetic head
JP3944138B2 (en) 2003-03-07 2007-07-11 アルプス電気株式会社 Thin film magnetic head
US8031432B2 (en) * 2007-12-12 2011-10-04 Hitachi Global Storage Technologies Netherlands B.V. Magnetic write head having helical coil with a fin structure for reduced heat induced protrusion

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4219854A (en) * 1978-12-21 1980-08-26 International Business Machines Corporation Thin film magnetic head assembly
JPS6052912A (en) * 1983-09-02 1985-03-26 Canon Electronics Inc Thin film magnetic head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8587900B2 (en) 2011-05-24 2013-11-19 HGST Netherlands B.V. Radiator-cooled nanowire-based write assist

Also Published As

Publication number Publication date
JPS62128011A (en) 1987-06-10

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