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21.发明申请公开(公告)号：US20070217048A1
公开(公告)日：2007-09-20
申请号：US11715132
申请日：2007-03-06
申请人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
发明人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
CPC分类号： G11B5/82 , G11B5/1278 , G11B5/65
摘要： Embodiments in accordance with the present invention provide a perpendicular magnetic recording medium which is easy to record, offers superior thermal stability of recording magnetization, and allows high-density recording. In one embodiment, a perpendicular magnetic layer with controlled magnetic properties is used as a magnetic storage layer of a perpendicular magnetic recording medium, the magnetic properties having been controlled such that an indicator σhsw [%] of the dispersion of magnetization switching fields in the perpendicular magnetic layer and an indicator Dn [nm] of the intensity of exchange interactions, in film surface directions, in the perpendicular magnetic layer satisfy inequalities σhsw/27+Dn/90 20. The indicators can be measured using a magnetometer.
摘要翻译： 根据本发明的实施例提供了易于记录的垂直磁记录介质，提供了优异的记录磁化的热稳定性，并允许高密度记录。 在一个实施例中，使用具有受控磁特性的垂直磁性层作为垂直磁记录介质的磁存储层，其磁特性已经被控制，使得该磁性性质的指示符σ< 垂直磁性层中的磁化开关场的分散和膜的表面方向上的交换相互作用强度的指示器D N n [nm]满足不等式sigmah < / SUB + / 27 + D / 90 <1和D 20。 指标可以用磁力计测量。
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22.发明授权公开(公告)号：US07701667B2
公开(公告)日：2010-04-20
申请号：US11651922
申请日：2007-01-09
IPC分类号： G11B5/66
摘要： Embodiments in accordance with the present invention provide a perpendicular recording medium with low noise and high recording density by reducing the effects from noise generated from the vicinity of the interface with the intermediate layer of the recording layer, in a perpendicular recording medium utilizing a granular recording layer containing oxygen or oxide additive in a cobalt-chromium alloy formed on an intermediate layer with a ruthenium or ruthenium alloy layer. A first recording layer and a second recording layer are formed in order on an intermediate layer of ruthenium or ruthenium alloy. The first recording layer and the second recording layer are comprised of cobalt as the main material in a granular structure containing chromium and oxygen. The saturation magnetization of the first recording layer is lower than the saturation magnetization of the second recording layer. When a first recording layer saturation magnetization is set as Ms1(emu per cubic centimeter), a second recording layer saturation magnetization is set as Ms2(emu per cubic centimeter), and the first recording layer film thickness is set to t1 (nm), then (Ms2−Ms1)×t1 will be larger than 0 (memu per square centimeter) and smaller than 0.15 (memu per square centimeter).
摘要翻译： 根据本发明的实施例通过减少在与记录层的中间层的界面附近产生的噪声的影响，在使用粒状记录的垂直记录介质中提供具有低噪声和高记录密度的垂直记录介质 在含有钌或钌合金层的中间层上形成的钴 - 铬合金中含有氧或氧化物添加剂的层。 在钌或钌合金的中间层上依次形成第一记录层和第二记录层。 第一记录层和第二记录层由包含铬和氧的颗粒结构中的钴作为主要材料组成。 第一记录层的饱和磁化强度低于第二记录层的饱和磁化强度。 当第一记录层的饱和磁化强度设定为Ms1（emu /立方厘米）时，第二记录层的饱和磁化强度设定为Ms2（emu /立方厘米），第一记录层膜厚设定为t1（nm） 那么（Ms2-Ms1）×t1将大于0（每平方厘米的记忆），小于0.15（每平方厘米的记忆）。
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23.发明申请公开(公告)号：US20090195924A1
公开(公告)日：2009-08-06
申请号：US12288654
申请日：2008-10-21
CPC分类号： G11B5/732 , G11B5/65 , G11B5/66 , G11B5/667 , G11B5/7325
摘要： Embodiments of the present invention help allow accurate control of the magnetization reversal in a magnetic recording layer in small reversal units, whereby high-density recording can be achieved. According to one embodiment, by forming an intermediate layer having a granular structure similar to that of the magnetic recording layer below the magnetic recording layer, a continuous crystal grain boundary is formed at the interface between the magnetic recording layer and the intermediate layer, thereby preventing incomplete formation of the crystal grain boundary found in the initial growth layer of the magnetic recording layer. The intermediate layer comprises a non-magnetic alloy comprising Co and Cr as its main components and an oxide such as Al, Cr, Hf. Mg, Nb, Si, Ta, Ti and Zr. Further, the average content of the oxygen element in the intermediate layer is in the range from 6 at % to 20 at %.
摘要翻译： 本发明的实施例有助于在小的反转单元中精确地控制磁记录层中的磁化反转，由此可以实现高密度记录。 根据一个实施例，通过在磁记录层下方形成具有类似于磁记录层的颗粒结构的中间层，在磁记录层和中间层之间的界面处形成连续的晶界，从而防止 在磁记录层的初始生长层中发现的晶界的不完全的形成。 中间层包括以Co和Cr为主要成分的非磁性合金和Al，Cr，Hf等氧化物。 Mg，Nb，Si，Ta，Ti和Zr。 此外，中间层中的氧元素的平均含量在6at％至20at％的范围内。
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24.发明申请公开(公告)号：US20060088737A1
公开(公告)日：2006-04-27
申请号：US11258532
申请日：2005-10-24
申请人： Yoshiyuki Hirayama , Ikuko Takekuma , Ichiro Tamai
发明人： Yoshiyuki Hirayama , Ikuko Takekuma , Ichiro Tamai
CPC分类号： G11B5/7325 , C23C14/06 , C23C14/3492 , G11B5/65 , G11B5/851 , Y02T50/67
摘要： Embodiments of the invention provide a perpendicular magnetic recording medium having a granular structured magnetic recording layer including many columnar grains, and grain boundary layers containing oxide, wherein a high medium S/N ratio is obtained while securing head flyability and durability. In an embodiment, the perpendicular magnetic recording medium includes a granular structured magnetic recording layer having many columnar grains, as well as grain boundary layers including oxide respectively. Assuming that the columnar grains are divided equally in the film thickness direction into a protective layer side portion and an intermediate layer side portion, and the diameter of the protective layer side portion is larger than that of the intermediate layer side portion.
摘要翻译： 本发明的实施例提供一种垂直磁记录介质，其具有包括许多柱状颗粒的粒状结构磁记录层和含有氧化物的晶界层，其中在确保磁头可飞行性和耐久性的同时获得高介质S / N比。 在一个实施例中，垂直磁记录介质包括具有许多柱状晶粒的颗粒结构磁记录层以及分别包括氧化物的晶界层。 假设柱状晶粒在膜厚度方向上被均等地分割成保护层侧部分和中间层侧部分，并且保护层侧部分的直径大于中间层侧部分的直径。
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25.发明申请PERPENDICULAR MAGNETIC RECORDING MEDIUM WITH GRANULAR STRUCTURED MAGNETIC RECORDING LAYER, METHOD FOR PRODUCING THE SAME, AND MAGNETIC RECORDING APPARATUS 审中-公开具有颗粒结构的磁记录层的周期性磁记录介质，其制造方法和磁记录装置公开(公告)号：US20080186627A1
公开(公告)日：2008-08-07
申请号：US12061518
申请日：2008-04-02
申请人： Yoshiyuki Hirayama , Ikuko Takekuma , Ichiro Tamai
发明人： Yoshiyuki Hirayama , Ikuko Takekuma , Ichiro Tamai
CPC分类号： G11B5/7325 , C23C14/06 , C23C14/3492 , G11B5/65 , G11B5/851 , Y02T50/67
摘要： Embodiments of the invention provide a perpendicular magnetic recording medium having a granular structured magnetic recording layer including many columnar grains, and grain boundary layers containing oxide, wherein a high medium S/N ratio is obtained while securing head flyability and durability. In an embodiment, the perpendicular magnetic recording medium includes a granular structured magnetic recording layer having many columnar grains, as well as grain boundary layers including oxide respectively. Assuming that the columnar grains are divided equally in the film thickness direction into a protective layer side portion and an intermediate layer side portion, and the diameter of the protective layer side portion is larger than that of the intermediate layer side portion.
摘要翻译： 本发明的实施例提供一种垂直磁记录介质，其具有包括许多柱状颗粒的粒状结构磁记录层和含有氧化物的晶界层，其中在确保磁头可飞行性和耐久性的同时获得高介质S / N比。 在一个实施例中，垂直磁记录介质包括具有许多柱状晶粒的颗粒结构磁记录层以及分别包括氧化物的晶界层。 假设柱状晶粒在膜厚度方向上被均等地分割成保护层侧部分和中间层侧部分，并且保护层侧部分的直径大于中间层侧部分的直径。
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26.发明授权公开(公告)号：US08771849B2
公开(公告)日：2014-07-08
申请号：US12288654
申请日：2008-10-21
IPC分类号： G11B5/66
CPC分类号： G11B5/732 , G11B5/65 , G11B5/66 , G11B5/667 , G11B5/7325
摘要： Embodiments of the present invention help allow accurate control of the magnetization reversal in a magnetic recording layer in small reversal units, whereby high-density recording can be achieved. According to one embodiment, by forming an intermediate layer having a granular structure similar to that of the magnetic recording layer below the magnetic recording layer, a continuous crystal grain boundary is formed at the interface between the magnetic recording layer and the intermediate layer, thereby preventing incomplete formation of the crystal grain boundary found in the initial growth layer of the magnetic recording layer. The intermediate layer comprises a non-magnetic alloy comprising Co and Cr as its main components and an oxide such as Al, Cr, Hf. Mg, Nb, Si, Ta, Ti and Zr. Further, the average content of the oxygen element in the intermediate layer is in the range from 6 at % to 20 at %.
摘要翻译： 本发明的实施例有助于在小的反转单元中精确地控制磁记录层中的磁化反转，由此可以实现高密度记录。 根据一个实施例，通过在磁记录层下方形成具有类似于磁记录层的颗粒结构的中间层，在磁记录层和中间层之间的界面处形成连续的晶界，从而防止 在磁记录层的初始生长层中发现的晶界的不完全的形成。 中间层包括以Co和Cr为主要成分的非磁性合金和Al，Cr，Hf等氧化物。 Mg，Nb，Si，Ta，Ti和Zr。 此外，中间层中的氧元素的平均含量在6at％至20at％的范围内。
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27.发明申请公开(公告)号：US20070188924A1
公开(公告)日：2007-08-16
申请号：US11651922
申请日：2007-01-09
IPC分类号： G11B5/82
摘要： Embodiments in accordance with the present invention provide a perpendicular recording medium with low noise and high recording density by reducing the effects from noise generated from the vicinity of the interface with the intermediate layer of the recording layer, in a perpendicular recording medium utilizing a granular recording layer containing oxygen or oxide additive in a cobalt-chromium alloy formed on an intermediate layer with a ruthenium or ruthenium alloy layer. A first recording layer and a second recording layer are formed in order on an intermediate layer of ruthenium or ruthenium alloy. The first recording layer and the second recording layer are comprised of cobalt as the main material in a granular structure containing chromium and oxygen. The saturation magnetization of the first recording layer is lower than the saturation magnetization of the second recording layer. When a first recording layer saturation magnetization is set as Ms1 (emu per cubic centimeter), a second recording layer saturation magnetization is set as Ms2 (emu per cubic centimeter), and the first recording layer film thickness is set to t1 (nm), then (Ms2−Ms1)×t1 will be larger than 0 (memu per square centimeter) and smaller than 0.15 (memu per square centimeter).
摘要翻译： 根据本发明的实施例通过减少在与记录层的中间层的界面附近产生的噪声的影响，在使用粒状记录的垂直记录介质中提供具有低噪声和高记录密度的垂直记录介质 在含有钌或钌合金层的中间层上形成的钴 - 铬合金中含有氧或氧化物添加剂的层。 在钌或钌合金的中间层上依次形成第一记录层和第二记录层。 第一记录层和第二记录层由包含铬和氧的颗粒结构中的钴作为主要材料组成。 第一记录层的饱和磁化强度低于第二记录层的饱和磁化强度。 当第一记录层的饱和磁化强度设定为Ms 1（emu /立方厘米）时，第二记录层的饱和磁化强度设定为Ms 2（emu每立方厘米），第一记录层膜厚设定为t 1（ nm），则（Ms 2 -Ms 1）xt 1将大于0（每平方厘米的记忆）并小于0.15（每平方厘米的记忆）。
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公开(公告)号：US07625644B2
公开(公告)日：2009-12-01
申请号：US11257978
申请日：2005-10-24
IPC分类号： G11B5/66
摘要： In a granular magnetic recording layer of a perpendicular magnetic recording medium, media noises are reduced by separating adequately magnetic crystal grains and non-magnetic grain boundary and decreasing magnetic exchange interactions among the magnetic crystal grains without causing damage to magnetic anisotropy of the magnetic crystal grains. In one embodiment, the perpendicular magnetic recording medium, in which crystal alloy grains containing Co, Pt, and Cr, and non-magnetic grain boundary containing Si and O is included; the ratio of the number of O atom to that of Si atom in the magnetic recording layer is between about 2.5 and 5; the Si atomic composition in the magnetic recording layer is between about 3 and 6 atomic %; and the O atomic composition in the magnetic recording layer is between about 12 and 20 atomic %, is used. The in-plane distribution of perpendicular coercivity at any points of the medium of the magnetic recording layer is made at most about ±10% of an average value.
摘要翻译： 在垂直磁记录介质的粒状磁记录层中，通过分离磁性晶粒和非磁性晶界以及降低磁晶粒之间的磁交换相互作用而不损害磁性晶粒的磁各向异性来降低介质噪声 。 在一个实施例中，包括含有Co，Pt和Cr的晶体合金晶粒和含有Si和O的非磁性晶界的垂直磁记录介质; 磁记录层中的O原子数与Si原子数的比例在约2.5和5之间; 磁记录层中的Si原子组成在约3和6原子％之间; 并且使用磁记录层中的O原子组成为约12至20原子％。 在磁记录层的介质的任何点处的垂直矫顽力的平面内分布最多为平均值的约±10％。
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29.发明申请Perpendicular magnetic recording medium and magnetic storage apparatus using the same 审中-公开垂直磁记录介质及使用其的磁存储装置公开(公告)号：US20090116137A1
公开(公告)日：2009-05-07
申请号：US12288598
申请日：2008-10-21
CPC分类号： G11B5/66 , G11B5/65 , G11B5/7379
摘要： Embodiments of the present invention provide a perpendicular magnetic recoding medium capable of decreasing exchange coupling between crystal grains while suppressing increase in the crystal grain size of the magnetic recording layer. According to one embodiment, a perpendicular magnetic recoding medium is formed by stacking a seed layer, an intermediate layer, a magnetic recording layer, and a protecting layer all above a substrate. The magnetic recording layer has a granular structure constituted of a plurality of columnar grains comprising a CoCrPt alloy and a grain boundary containing an oxide. The seed layer is formed by stacking a first seed layer, a second seed layer, and a third seed layer in which the first seed layer comprises Ti or Ti alloy having a hexagonal close-packed structure, the second seed layer comprises Cu, Ag, or Al having a face-centered cubic structure or an alloy containing at least one element selected therefrom, and the third seed layer comprises an Ni alloy having a face-centered cubic structure.
摘要翻译： 本发明的实施例提供一种垂直磁记录介质，其能够减少晶粒之间的交换耦合，同时抑制磁记录层的晶粒尺寸的增加。 根据一个实施例，垂直磁记录介质是通过在基底上层叠种子层，中间层，磁记录层和保护层而形成的。 磁记录层具有由包括CoCrPt合金和含有氧化物的晶界的多个柱状晶粒构成的粒状结构。 种子层通过层叠第一种子层，第二种子层和第三种子层而形成，其中第一种子层包含具有六方密堆积结构的Ti或Ti合金，第二籽晶层包含Cu，Ag， 或具有面心立方结构的Al或含有选自其中的至少一种元素的合金，并且所述第三晶种层包括具有面心立方结构的Ni合金。
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公开(公告)号：US20070254189A1
公开(公告)日：2007-11-01
申请号：US11726691
申请日：2007-03-21
申请人： Hiroyuki Nakagawa , Ikuko Takekuma
发明人： Hiroyuki Nakagawa , Ikuko Takekuma
CPC分类号： G11B5/66 , G11B5/11 , G11B5/1278 , G11B5/3146 , G11B5/315 , G11B5/656 , G11B2005/0029
摘要： Embodiments in accordance with the present invention achieve a higher recording than that of the prior art by using a perpendicular magnetic recording medium showing good recording reproduction characteristics in combination with a shielded pole head. A perpendicular magnetic recording medium and a shielded pole head are used. The shielded pole head comprises a single pole type writer having a main pole and an auxiliary pole, and a magnetic shield is provided via a non-magnetic gap layer so as to cover at least the down-track direction of trailing side of the main pole. The perpendicular magnetic recording medium has two recording layers. The first recording layer comprises ferromagnetic crystal grains having Co as principal component and containing at least Cr and Pt, and grain boundaries containing an oxide. The second recording layer comprises an alloy having Co as principal component, containing at least Cr, and not containing an oxide. The saturation magnetization Ms1 (kA/m) of the first recording layer, the saturation magnetization Ms2 (kA/m) of the second recording layer and the film thickness ts (nm) of the soft-magnetic underlayer satisfy the following relation: 20+0.033*ts2+2.3*ts≦4/3*Ms1−Ms2≦329−0.024*ts2+1.9*ts
摘要翻译： 根据本发明的实施例通过使用显示良好记录再现特性的垂直磁记录介质与屏蔽极头组合，实现了比现有技术更高的记录。 使用垂直磁记录介质和屏蔽极头。 屏蔽极头包括具有主极和辅助极的单极型写入器，并且经由非磁隙层提供磁屏蔽，以便至少覆盖主极的后侧的向下轨道方向 。 垂直磁记录介质具有两个记录层。 第一记录层包括具有Co作为主要成分并且至少含有Cr和Pt以及含有氧化物的晶界的铁磁性晶粒。 第二记录层包括具有Co作为主要成分的至少包含Cr并且不含有氧化物的合金。 第一记录层的饱和磁化强度Ms 1（kA / m），第二记录层的饱和磁化强度Ms 2（kA / m）和软磁性底层的膜厚度ts（nm）满足以下关系： <？in-line-formula description =“In-line Formulas”end =“lead”？> 20 + 0.033 * ts <2> + 2.3 * ts <= 4/3 * Ms1-Ms2 < 329-0.024 * ts <2> + 1.9 * ts <？in-line-formula description =“In-line Formulas”end =“tail”？>
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