JP4070147B1 - 磁気記録媒体 - Google Patents
磁気記録媒体 Download PDFInfo
- Publication number
- JP4070147B1 JP4070147B1 JP2006262350A JP2006262350A JP4070147B1 JP 4070147 B1 JP4070147 B1 JP 4070147B1 JP 2006262350 A JP2006262350 A JP 2006262350A JP 2006262350 A JP2006262350 A JP 2006262350A JP 4070147 B1 JP4070147 B1 JP 4070147B1
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- magnetic powder
- powder
- magnetic recording
- 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 - Fee Related
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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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
- G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
-
- 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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/712—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the surface treatment or coating of magnetic particles
-
- 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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/714—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the dimension of the magnetic particles
Abstract
【解決手段】鉄および窒素を少なくとも構成元素とし、かつFe16N2 相を少なくとも含む平均粒子サイズが5〜50nmの粒状ないし楕円状の磁性粉を使用した磁気記録媒体において、磁性層に珪素含有化合物(好ましくはシロキサン含有化合物)を含有させる。
【選択図】なし
Description
以下の実施例において述べる本発明の磁気記録媒体の作製方法は、非磁性支持体上に直接磁性層を形成する、いわゆる単層媒体であるが、非磁性支持体上に下塗層を形成し、この下塗層上に磁性層を形成するいわゆる重層媒体にも適用できることは言うまでもない。
表面にイットリウムとアルミニウムの酸化物層を形成したほぼ球状に近い平均粒子サイズが20nmのマグネタイト粒子を出発原料とした。この原料のイットリウムとアルミニウムの含有量は鉄に対して、それぞれ1.2原子%と9.8原子%であった。この原料粒子を水素気流中450℃で2時間加熱還元して、イットリウムとアルミニウムを含有する鉄系磁性粉を得た。つぎに、水素ガスを流した状態で、約1時間かけて、150℃まで降温した。150℃に到達した状態で、ガスをアンモニアガスに切り替え、温度を150℃に保った状態で、30時間窒化処理を行った。その後、アンモニアガスを流した状態で、150℃から90℃まで降温し、90℃で、アンモニアガスから酸素と窒素の混合ガスに切り替え、2時間安定化処理を行った。
上記(A)で作製したイットリウム・アルミニウム含有−窒化鉄系磁性粉を用いて、下記組成の磁性塗料を作製した。磁性塗料の作製にはフリッチェ社製の遊星型ボールミルにより、ジルコニアビーズを用いて10時間分散させた。
・窒化鉄系磁性粉 80重量部
・塩化ビニル−ヒドロキシプロピルアクリレート共重合樹脂 10重量部
(含有−SO3 Na基:0.7×10-4当量/g)
・ポリエステルポリウレタン樹脂 6重量部
(含有−SO3 Na基:1.0×10-4当量/g)
・メチルエチルケトン 133重量部
・トルエン 100重量部
実施例1において、珪素含有化合物を添加しないで磁性塗膜を作製した以外は、実施例1と同様にして磁気記録媒体を作製した。
上記の実施例1〜3および比較例1の各磁気記録媒体から約1cm四方の矩形片(表面に磁性塗膜の形成されたPETの小片)をそれぞれ切り出してサンプルとし、これらの磁性塗膜(磁性層)の磁気特性である長手方向の保磁力、角形比および飽和磁束密度を測定した。また、化学的安定性については、各サンプルを、温度が60℃、相対湿度が90%の条件下で1週間保持した時の磁気特性の変化を調べた。
Claims (3)
- 非磁性支持体と、
この非磁性支持体の一方の面側に設けられた、磁性粉および結合剤を含有する磁性層とを有し、
前記磁性粉が、少なくとも鉄および窒素を構成元素とし且つFe16N2 相を含む平均粒子サイズが5nm以上50nm以下の粒状ないし楕円状の磁性粉からなる磁気記録媒体であって、
前記磁性層にはテトラメチルシクロテトラシロキサンまたはオクタメチルシクロテトラシロキサンが前記磁性粉に対して0.1〜20重量%含有されていることを特徴とする磁気記録媒体。 - 磁性粉は、希土類元素、ホウ素、シリコン、アルミニウム、リンの中から選ばれる少なくともひとつの元素を当該磁性粉中の鉄に対して0.05〜20.0原子%含有してなる、請求項1記載の磁気記録媒体。
- 長手方向の保磁力(Hc)が79.6〜318.4kA/m(1,000〜4,000Oe)、長手方向の角形比(Br/Bm)が0.6〜0.9である、請求項1または2に記載の磁気記録媒体。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006262350A JP4070147B1 (ja) | 2006-09-27 | 2006-09-27 | 磁気記録媒体 |
US11/898,183 US20080075981A1 (en) | 2006-09-27 | 2007-09-10 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006262350A JP4070147B1 (ja) | 2006-09-27 | 2006-09-27 | 磁気記録媒体 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP4070147B1 true JP4070147B1 (ja) | 2008-04-02 |
JP2008084420A JP2008084420A (ja) | 2008-04-10 |
Family
ID=39225368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2006262350A Expired - Fee Related JP4070147B1 (ja) | 2006-09-27 | 2006-09-27 | 磁気記録媒体 |
Country Status (2)
Country | Link |
---|---|
US (1) | US20080075981A1 (ja) |
JP (1) | JP4070147B1 (ja) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5252380A (en) * | 1988-10-31 | 1993-10-12 | Hitachi Maxell, Ltd. | Acicular alloy containing magnetic recording medium |
JPH0528466A (ja) * | 1991-07-22 | 1993-02-05 | Fuji Photo Film Co Ltd | 金属薄膜型磁気記録媒体 |
AU2327300A (en) * | 1999-02-10 | 2000-08-29 | Hitachi Maxell, Ltd. | Magnetic recording medium, and magnetic powder and method for preparing the same |
JP3886968B2 (ja) * | 2002-03-18 | 2007-02-28 | 日立マクセル株式会社 | 磁気記録媒体および磁気記録カートリッジ |
GB2422949B (en) * | 2003-02-19 | 2007-05-30 | Hitachi Maxell | Magnetic recording medium |
JP2005158186A (ja) * | 2003-11-27 | 2005-06-16 | Hitachi Maxell Ltd | 磁気記録媒体およびその製造方法 |
EP1548760A3 (en) * | 2003-11-27 | 2007-12-26 | DOWA Electronics Materials Co., Ltd. | Iron nitride magnetic powder and method of producing the powder |
JP2005228377A (ja) * | 2004-02-10 | 2005-08-25 | Hitachi Maxell Ltd | 磁気テープ |
-
2006
- 2006-09-27 JP JP2006262350A patent/JP4070147B1/ja not_active Expired - Fee Related
-
2007
- 2007-09-10 US US11/898,183 patent/US20080075981A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20080075981A1 (en) | 2008-03-27 |
JP2008084420A (ja) | 2008-04-10 |
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