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公开(公告)号：US20120113768A1
公开(公告)日：2012-05-10
申请号：US13384933
申请日：2010-08-19
申请人： Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
发明人： Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
CPC分类号： G11B5/7325 , G11B5/6088 , G11B5/656 , G11B5/82 , G11B2005/0021
摘要： A heat-assisted magnetic recording medium that includes a substrate 1, underlayers formed on the substrate 1, and a magnetic layer 5 which is formed on the underlayers and contains either an FePt alloy having an L10 structure or a CoPt alloy having an L10 structure as a main component, wherein the underlayers include a first underlayer 2 formed from an amorphous alloy, a second underlayer 3 formed from an alloy having a BCC structure containing Cr as a main component and also containing at least one element selected from among Ti, Mo, W, V, Mn and Ru, and a third underlayer 4 formed from MgO. Also, a magnetic storage device that uses the heat-assisted magnetic recording medium.
摘要翻译： 一种热辅助磁记录介质，其包括基板1，形成在基板1上的底层和形成在底层上的磁性层5，并且包含具有L10结构的FePt合金或具有L10结构的CoPt合金作为 主要成分，其中底层包括由非晶合金形成的第一底层2，由具有包含Cr作为主要成分的BCC结构的合金形成的第二底层3，并且还含有选自Ti，Mo， W，V，Mn和Ru，以及由MgO形成的第三底层4。 而且，使用该热辅助磁记录介质的磁存储装置。
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公开(公告)号：US08279739B2
公开(公告)日：2012-10-02
申请号：US13384933
申请日：2010-08-19
申请人： Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
发明人： Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
IPC分类号： G11B3/70
CPC分类号： G11B5/7325 , G11B5/6088 , G11B5/656 , G11B5/82 , G11B2005/0021
摘要： A heat-assisted magnetic recording medium that includes a substrate, underlayers formed on the substrate, and a magnetic layer which is formed on the underlayers and contains either an FePt alloy having an L10 structure or a CoPt alloy having an L10 structure as a main component, wherein the underlayers include a first underlayer formed from an amorphous alloy, a second underlayer formed from an alloy having a BCC structure containing Cr as a main component and also containing at least one element selected from among Ti, Mo, W, V, Mn and Ru, and a third underlayer formed from MgO. Also, a magnetic storage device that uses the heat-assisted magnetic recording medium.
摘要翻译： 一种热辅助磁记录介质，其包括基板，形成在基板上的底层，和形成在底层上的磁性层，并且含有具有L10结构的FePt合金或具有L10结构的CoPt合金作为主要成分 其特征在于，所述底层包括由非晶合金形成的第一底层，由具有以Cr为主成分的BCC结构的合金形成的第二底层，还含有选自Ti，Mo，W，V，Mn中的至少一种元素 和Ru，以及由MgO形成的第三底层。 而且，使用该热辅助磁记录介质的磁存储装置。
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3.发明授权公开(公告)号：US08705207B2
公开(公告)日：2014-04-22
申请号：US12627719
申请日：2009-11-30
申请人： Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
发明人： Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
IPC分类号： G11B5/82
CPC分类号： G11B5/66 , G11B5/65 , G11B5/82 , G11B2005/0021
摘要： A thermal-assist magnetic recording medium is provided which can accomplish a surface recording density of 1 Tbit/inch2. The thermal-assist magnetic recording medium includes: a substrate; a plurality of underlying layers formed on the substrate; a first magnetic layer formed on the underlying layers; a coupling control layer formed on the first magnetic layer and formed of a ferromagnetic alloy; and a second magnetic layer formed on the coupling control layer. Here, Curie temperatures of the first magnetic layer and the second magnetic layer are higher than the Curie temperature of the coupling control layer, an anisotropy magnetic field of the first magnetic layer is greater than the anisotropy magnetic field of the second magnetic layer, and a saturation magnetic field has a minimum value at a temperature of 350° C. or lower.
摘要翻译： 提供能够实现1Tbit / inch2的表面记录密度的热辅助磁记录介质。 热辅助磁记录介质包括：基板; 形成在所述基板上的多个下层; 形成在下层上的第一磁性层; 形成在第一磁性层上并由铁磁性合金形成的耦合控制层; 以及形成在耦合控制层上的第二磁性层。 这里，第一磁性层和第二磁性层的居里温度高于耦合控制层的居里温度，第一磁性层的各向异性磁场大于第二磁性层的各向异性磁场， 饱和磁场在350℃以下的温度下具有最小值。
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4.发明申请公开(公告)号：US20100182714A1
公开(公告)日：2010-07-22
申请号：US12627719
申请日：2009-11-30
申请人： Tetsuya KANBE , Yuzo Sasaki , Atsushi Hashimoto
发明人： Tetsuya KANBE , Yuzo Sasaki , Atsushi Hashimoto
CPC分类号： G11B5/66 , G11B5/65 , G11B5/82 , G11B2005/0021
摘要： A thermal-assist magnetic recording medium is provided which can accomplish a surface recording density of 1 Tbit/inch2. The thermal-assist magnetic recording medium includes: a substrate; a plurality of underlying layers formed on the substrate; a first magnetic layer formed on the underlying layers; a coupling control layer formed on the first magnetic layer and formed of a ferromagnetic alloy; and a second magnetic layer formed on the coupling control layer. Here, Curie temperatures of the first magnetic layer and the second magnetic layer are higher than the Curie temperature of the coupling control layer, an anisotropy magnetic field of the first magnetic layer is greater than the anisotropy magnetic field of the second magnetic layer, and a saturation magnetic field has a minimum value at a temperature of 350° C. or lower.
摘要翻译： 提供能够实现1Tbit / inch2的表面记录密度的热辅助磁记录介质。 热辅助磁记录介质包括：基板; 形成在所述基板上的多个下层; 形成在下层上的第一磁性层; 形成在第一磁性层上并由铁磁性合金形成的耦合控制层; 以及形成在耦合控制层上的第二磁性层。 这里，第一磁性层和第二磁性层的居里温度高于耦合控制层的居里温度，第一磁性层的各向异性磁场大于第二磁性层的各向异性磁场， 饱和磁场在350℃以下的温度下具有最小值。
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5.发明申请THERMALLY ASSISTED MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE 审中-公开热辅助磁记录介质和磁记录和再现设备公开(公告)号：US20120300600A1
公开(公告)日：2012-11-29
申请号：US13574932
申请日：2011-01-24
CPC分类号： G11B5/66 , G11B5/314 , G11B5/6088 , G11B5/65 , G11B5/82 , G11B2005/0021
摘要： A thermally assisted magnetic recording medium having a structure in which a first magnetic layer 106 and a second magnetic layer 107 are formed on a substrate 101 in this order, wherein the first magnetic layer 106 has a granular structure containing a FePt alloy having a L10 structure, a CoPt alloy having a L10 crystal lattice structure or a CoPt alloy having a L11 crystal lattice structure, and at least one material for causing grain boundary segregation selected from the group consisting of SiO2, TiO2, Cr2O3, Al2O3, Ta2O5, ZrO2, Y2O3, CeO2, MnO, TiO, ZnO, and MgO, and the content of the material for causing grain boundary segregation in the first magnetic layer 106 is decreased from the substrate side to the second magnetic layer 107 side.
摘要翻译： 具有这样的结构的热辅助磁记录介质，其中第一磁性层106和第二磁性层107依次形成在基板101上，其中第一磁性层106具有包含具有L10结构的FePt合金的颗粒结构 具有L10晶格结构的CoPt合金或具有L11晶格结构的CoPt合金，以及选自SiO 2，TiO 2，Cr 2 O 3，Al 2 O 3，Ta 2 O 5，ZrO 2，Y 2 O 3中的至少一种用于引起晶界偏析的材料 CeO 2，MnO，TiO，ZnO和MgO，第一磁性层106中的晶界偏析材料的含量从基板侧减少到第二磁性层107侧。
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6.发明授权公开(公告)号：US08270286B2
公开(公告)日：2012-09-18
申请号：US13073408
申请日：2011-03-28
IPC分类号： G11B3/70
CPC分类号： G11B5/7325 , G11B5/65
摘要： Disclosed is a thermally assisted magnetic recording medium comprising a substrate, a plurality of underlayers formed on the substrate, and a magnetic layer which is formed on the underlayers and predominantly comprised of an alloy having an L10 structure, characterized in that at least one of said underlayers is predominantly comprised of MgO and comprises at least one kind of an element having a free energy for oxidation of, per mol of oxygen, not higher than −120 kcal/mol·O2 at 1000° C. The element having the free energy for oxidation is preferably selected from Al, Si, Ti, V, Cr, Mn, Zr and B. The thermally assisted magnetic recording medium has a magnetic layer comprised of magnetic crystal grains with uniform diameters, and exhibiting a sufficiently weak exchange coupling between magnetic grains.
摘要翻译： 公开了一种热辅助磁记录介质，其包括基板，形成在基板上的多个底层，以及形成在底层上并主要由具有L10结构的合金组成的磁性层，其特征在于，所述至少一个所述 底层主要由MgO组成，并且包含至少一种元素，其具有在1000℃下每摩尔氧气不超过-120千卡/摩尔·O 2的自由能。元素具有自由能 氧化优选选自Al，Si，Ti，V，Cr，Mn，Zr和B.热辅助磁记录介质具有由具有均匀直径的磁性晶粒构成的磁性层，并且在磁性颗粒之间呈现足够弱的交换耦合 。
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公开(公告)号：US09818441B2
公开(公告)日：2017-11-14
申请号：US13577085
申请日：2011-02-03
CPC分类号： G11B5/7325 , G11B5/314 , G11B5/65 , G11B2005/0005 , G11B2005/0021
摘要： Disclosed is a thermally assisted magnetic recording medium comprising a substrate, a plurality of underlayers formed on the substrate, and a magnetic layer which is formed on the underlayers and predominantly comprised of an alloy having a L10 structure, characterized in that at least one of the underlayers is predominantly comprised of MgO and comprises at least one oxide selected from SiO2, TiO2, Cr2O3, Al2O3, Ta2O5, ZrO2, Y2O3, CeO2, MnO, TiO and ZnO. The thermally assisted magnetic recording medium has a magnetic layer comprised of fine magnetic crystal grains, exhibiting a sufficiently weak exchange coupling between magnetic grains, and having a minimized coercive force dispersion.
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8.发明授权公开(公告)号：US08351309B2
公开(公告)日：2013-01-08
申请号：US13033010
申请日：2011-02-23
IPC分类号： G11B7/085
CPC分类号： G11B5/65 , G11B5/7325 , G11B2005/0021
摘要： Disclosed is a thermally assisted magnetic recording medium comprising a substrate, a plurality of underlayers formed on the substrate, and a magnetic layer which is formed on the underlayers and predominantly comprised of an alloy having a L10 structure, characterized in that at least one of the underlayers is predominantly comprised of MgO and comprises at least one kind of a metal element having a melting point of at least 2,000° C., such as Nb, Mo, Ru, Ta or W. The thermally assisted magnetic recording medium has magnetic crystal grains having uniform size in the magnetic layer, and has a narrow switching field distribution (SFD), and a magnetic recording storage provided with the thermally assisted magnetic recording medium exhibits a high SN ratio.
摘要翻译： 公开了一种热辅助磁记录介质，其包括基板，形成在基板上的多个底层，以及形成在底层上的主要由具有L10结构的合金组成的磁性层，其特征在于，至少一个 底层主要由MgO组成，并且包括至少一种熔点至少为2000℃的金属元素，例如Nb，Mo，Ru，Ta或W.该热辅助磁记录介质具有磁性晶粒 在磁性层中具有均匀的尺寸，并且具有窄的开关场分布（SFD），并且设置有热辅助磁记录介质的磁记录存储体呈现高SN比。
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公开(公告)号：US20120307398A1
公开(公告)日：2012-12-06
申请号：US13577085
申请日：2011-02-03
CPC分类号： G11B5/7325 , G11B5/314 , G11B5/65 , G11B2005/0005 , G11B2005/0021
摘要： Disclosed is a thermally assisted magnetic recording medium comprising a substrate, a plurality of underlayers formed on the substrate, and a magnetic layer which is formed on the underlayers and predominantly comprised of an alloy having a L10 structure, characterized in that at least one of the underlayers is predominantly comprised of MgO and comprises at least one oxide selected from SiO2, TiO2, Cr2O3, Al2O3, Ta2O5, ZrO2, Y2O3, CeO2, MnO, TiO and ZnO. The thermally assisted magnetic recording medium has a magnetic layer comprised of fine magnetic crystal grains, exhibiting a sufficiently weak exchange coupling between magnetic grains, and having a minimized coercive force dispersion.
摘要翻译： 公开了一种热辅助磁记录介质，其包括基板，形成在基板上的多个底层，以及形成在底层上的主要由具有L10结构的合金组成的磁性层，其特征在于，至少一个 底层主要由MgO组成，并且包括选自SiO 2，TiO 2，Cr 2 O 3，Al 2 O 3，Ta 2 O 5，ZrO 2，Y 2 O 3，CeO 2，MnO，TiO和ZnO中的至少一种氧化物。 热辅助磁记录介质具有由精细的磁性晶粒组成的磁性层，在磁性颗粒之间呈现足够弱的交换耦合，并具有最小的矫顽力分散。
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10.发明申请公开(公告)号：US20100215991A1
公开(公告)日：2010-08-26
申请号：US12671452
申请日：2008-07-25
CPC分类号： G11B5/7325 , G11B5/82 , G11B5/851
摘要： A perpendicular magnetic recording medium is provided, which has a soft magnetic layer, a seed layer, a first intermediate layer, a second intermediate layer and a perpendicular magnetic recording layer, formed in this order on a non-magnetic substrate, and is characterized in that the seed layer is comprised of a (002) crystal plane-orientated hcp structure, the first intermediate layer is comprised of a (110) crystal plane-orientated bcc structure and the second intermediate layer is comprised of a (002) crystal plane-orientated hcp structure. The (110) crystal plane-orientated bcc structure comprises at least 60 atomic % of Cr. The magnetic recording medium has fine and well discrete magnetic crystal grains with extremely small size and exhibits good perpendicular orientation in the perpendicular magnetic recording layer, and thus, the medium is capable of recording and reproducing information with high density.
摘要翻译： 提供了一种垂直磁记录介质，其具有在非磁性基板上依次形成的软磁性层，种子层，第一中间层，第二中间层和垂直磁记录层，其特征在于 种子层由（002）晶面取向的hcp结构构成，第一中间层由（110）晶面定向的bcc结构构成，第二中间层由（002）晶面取向的hcp结构构成， 定向hcp结构。 （110）晶面取向的bcc结构包含至少60原子％的Cr。 磁记录介质具有极小尺寸的精细且分散的磁晶粒，并且在垂直磁记录层中呈现出良好的垂直取向，因此该介质能够以高密度记录和再现信息。
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