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1. 发明专利

JP2010282671A Hexagonal ferrite magnetic powder and method for manufacturing the same, and magnetic recording medium and method for manufacturing the same 有权
标题翻译：六角形铁素体磁粉及其制造方法以及磁记录介质及其制造方法
公开(公告)号：JP2010282671A
公开(公告)日：2010-12-16
申请号：JP2009132903
申请日：2009-06-02
申请人： Asahi Glass Co Ltd , Fujifilm Corp , 富士フイルム株式会社 , 旭硝子株式会社
发明人： MATSUBAGUCHI SATOSHI , MATSUMOTO AYAKO , TADA TOSHIO , MANABE AKIRA
IPC分类号： G11B5/706 , G11B5/714 , G11B5/842 , H01F1/11
CPC分类号： G11B5/70678 , B82Y30/00 , C01G49/0036 , C01P2002/52 , C01P2004/64 , C01P2006/42 , C04B35/2633 , C04B35/2683 , C04B35/6281 , C04B35/62886 , C04B35/653 , C04B2235/3215 , C04B2235/3251 , C04B2235/3274 , C04B2235/3275 , C04B2235/3284 , C04B2235/3409 , C04B2235/5292 , C04B2235/5409 , C04B2235/5454 , C04B2235/767 , H01F1/11 , H01F41/16 , Y10T428/2982
摘要： PROBLEM TO BE SOLVED: To provide a hexagonal ferrite magnetic powder from which a magnetic recording medium with a markedly higher S/N ratio can be manufactured. SOLUTION: There are provided the hexagonal ferrite magnetic powder manufactured by a glass crystallization method and the magnetic recording medium including the powder. The powder has an average plate diameter of 15 to 25 nm, an average plate ratio of 2.0 to 2.8 and a coercive force Hc of 159 to 279 kA/m. There are provided a method for manufacturing the hexagonal ferrite magnetic powder and a method for manufacturing the magnetic recording medium including acquisition of the hexagonal ferrite magnetic powder by the method. A hexagonal ferrite forming component used in the method for manufacturing the hexagonal ferrite magnetic powder, includes only a pentavalent element component selected from the group composed of an Nb 2 O 5 component and a Ta 2 O 5 component as an Fe substitution component and a raw material mixture to be used contains ≥2.5 atom% pentavalent element selected from the group composed of Nb and Ta to 100 atom% of the sum total of the pentavalent element and Fe. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供可以制造具有显着高的S / N比的磁记录介质的六方晶系铁氧体磁粉。解决方案：提供了通过玻璃结晶法制造的六方晶系铁氧体磁粉和包含该粉末的磁记录介质。粉末的平均板直径为15〜25nm，平均板比为2.0〜2.8，矫顽力Hc为159〜279kA / m。提供了一种制造六方晶系铁氧体磁粉的方法和包括通过该方法获取六方晶系铁氧体磁粉的磁记录介质的制造方法。在六方晶系铁氧体磁粉的制造方法中使用的六方晶系铁氧体形成部件仅包含选自Nb 2 SB 3 O 3 SB 5成分的五价元素成分，作为Fe取代成分的Ta＆lt; SB＆gt; O＆lt; SB＆gt; 5＆gt;成分和使用的原料混合物，其含有≥2.5原子％的选自Nb和Ta的五价元素， 100原子％的五价元素和Fe的总和。版权所有（C）2011，JPO＆INPIT

2. 发明专利

JP2010235411A Method of manufacturing hexagonal ferrite magnetic powder, magnetic recording medium and method of manufacturing the same 有权
标题翻译：制造六角形铁素体磁粉的方法，磁记录介质及其制造方法
公开(公告)号：JP2010235411A
公开(公告)日：2010-10-21
申请号：JP2009086560
申请日：2009-03-31
申请人： Fujifilm Corp , 富士フイルム株式会社
发明人： KANZAWA SHIHO , TADA TOSHIO , YAMAZAKI NOBUO
IPC分类号： C04B35/622 , C04B35/26 , G11B5/706 , G11B5/714 , G11B5/842 , H01F1/11
CPC分类号： H01F1/11 , B82Y30/00 , C01G49/0036 , C01G49/009 , C01P2002/52 , C01P2006/42 , C01P2006/80 , C04B35/2683 , C04B35/62665 , C04B2235/3215 , C04B2235/5292 , C04B2235/5454 , C04B2235/767 , G11B5/70678 , H01F41/16
摘要： PROBLEM TO BE SOLVED: To provide a hexagonal ferrite magnetic powder capable of achieving ultrahigh-density recording, and a magnetic recording medium suitable for high-density recording using the hexagonal ferrite magnetic powder.
SOLUTION: A method of manufacturing the hexagonal ferrite magnetic powder comprises: preparing a melt by melting a starting material mixture comprising a hexagonal ferrite-forming component and a glass-forming component; rapidly cooling the melt so as to obtain an amorphous material comprising 0.3-2.0 mass% carbon atoms; heating the amorphous material to a temperature range of 580-700°C and maintaining the amorphous material within the temperature range so as to precipitate hexagonal ferrite magnetic particles; and collecting the hexagonal ferrite magnetic particles precipitated. The magnetic recording medium has a magnetic layer comprising a binder and the hexagonal ferrite magnetic powder manufactured by the method on a non-magnetic support. A method of manufacturing the magnetic recording medium comprise: obtaining the hexagonal ferrite magnetic powder by the method; and forming the magnetic layer using the obtained hexagonal ferrite magnetic powder.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供能够实现超高密度记录的六方晶系铁氧体磁粉和适用于使用六方晶系铁氧体磁粉的高密度记录的磁记录介质。解决方案：制造六方晶系铁氧体磁粉的方法包括：通过熔化包含六方晶系铁素体形成组分和玻璃形成组分的原料混合物来制备熔体; 快速冷却熔体，得到含有0.3〜2.0质量％碳原子的无定形物质; 将非晶材料加热到580-700℃的温度范围，并将非晶材料保持在温度范围内以使六方晶系铁氧体磁性颗粒沉淀; 并收集六方晶系铁氧体磁性颗粒沉淀。磁记录介质具有包含粘合剂的磁性层和通过非磁性载体上的方法制造的六方晶系铁氧体磁性粉末。制造磁记录介质的方法包括：通过该方法获得六方晶系铁氧体磁粉; 并使用得到的六方晶系铁氧体磁粉形成磁性层。版权所有（C）2011，JPO＆INPIT

3. 发明专利

JP2014192256A Hexagonal ferrite magnetic particle, process of manufacturing the same, magnetic powder for magnetic recording, and magnetic recording medium 有权
标题翻译：六角法磁铁颗粒，其制造方法，用于磁记录的磁粉和磁记录介质
公开(公告)号：JP2014192256A
公开(公告)日：2014-10-06
申请号：JP2013064932
申请日：2013-03-26
申请人： Fujifilm Corp , 富士フイルム株式会社
发明人： TADA TOSHIO , SUZUKI HIROYUKI , SHIMIZU OSAMU
IPC分类号： H01F1/11 , C01G49/00 , G11B5/706 , G11B5/714 , G11B5/84
CPC分类号： H01F1/11 , G11B5/70615 , G11B5/70678
摘要： PROBLEM TO BE SOLVED: To provide a fine particulate hexagonal ferrite magnetic particle having high thermal stability.SOLUTION: A hexagonal ferrite magnetic particle has an activation volume in a range of 1000 to 1500 nmand thermal stability, when being subjected to magnetization reversal by 10%, ΔE(10%)/kT of 40 or higher.
摘要翻译：要解决的问题：提供具有高热稳定性的细颗粒状六方晶系铁氧体磁性颗粒。解决方案：六方晶系铁氧体磁性颗粒的活化体积在1000至1500nm的范围内，并且当经过磁化反转10％，＆Dgr; E（10％）/ kT为40以上。

4. 发明专利

JP2010024113A Method for producing hexagonal ferrite magnetic powder, and magnetic recording medium and method for producing the same 有权
标题翻译：用于生产六角形铁素体磁粉的方法和磁记录介质及其制造方法
公开(公告)号：JP2010024113A
公开(公告)日：2010-02-04
申请号：JP2008189410
申请日：2008-07-23
申请人： Fujifilm Corp , 富士フイルム株式会社
发明人： YAMAZAKI NOBUO , TADA TOSHIO
IPC分类号： C01G49/00 , B82B3/00 , C01B33/12 , C01B35/10 , C30B1/02 , C30B29/22 , C30B29/66 , G11B5/70 , G11B5/706 , G11B5/714 , G11B5/842 , H01F1/11
CPC分类号： G11B5/70678 , B82Y30/00 , C01G49/0036 , C01G49/0063 , C01G49/009 , C01G49/04 , C01G51/006 , C01P2002/02 , C01P2002/52 , C01P2004/51 , C01P2004/64 , C01P2006/42 , G11B5/70 , H01F1/11
摘要： PROBLEM TO BE SOLVED: To provide a hexagonal ferrite magnetic powder achieving ultrahigh density recording, and a magnetic recording medium using the hexagonal ferrite magnetic powder and suitable for high density recording. SOLUTION: A method for producing such a hexagonal ferrite magnetic powder includes: melting a raw material mixture containing glass-forming components containing a B 2 O 3 component and hexagonal ferrite-forming components, and containing the B 2 O 3 component in an amount of 15-27 mol% in terms of B 2 O 3 to form a melt; rapidly cooling the melt to form a solidified product having a saturation magnetization of ≤0.6 A×m 2 /kg; and depositing a hexagonal ferrite magnetic powder having an average plate diameter of 15-25 nm by heating the solidified product to a temperature range of 600-690°C and keeping it in the temperature range. The magnetic recording medium has a magnetic layer containing a hexagonal ferrite magnetic powder produced by the method and a binder on a nonmagnetic support. A method for producing such a magnetic recording medium includes the method. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供实现超高密度记录的六方晶系铁氧体磁粉，以及使用六方晶系铁氧体磁粉并适合于高密度记录的磁记录介质。解决方案：制备这种六方晶系铁氧体磁性粉末的方法包括：熔化包含含有B 2 3 组分的玻璃形成组分的原料混合物和六方晶系铁素体形成组分，并且含有B 2 SB 3 O 3 SBB组分的含量为15-27mol％的B 2 SB> 3 以形成熔体; 快速冷却熔体形成饱和磁化强度≤0.6A×m 2 / kg的固化产品; 并通过将固化产物加热到600-690℃的温度范围并将其保持在温度范围内，沉积平均板直径为15-25nm的六方晶系铁氧体磁粉。磁记录介质具有含有通过该方法制造的六方晶系铁氧体磁性粉末和非磁性载体上的粘合剂的磁性层。制造这种磁记录介质的方法包括该方法。版权所有（C）2010，JPO＆INPIT

5. 发明专利

JP2012204726A Magnetic powder for magnetic recording and method for manufacturing the same, and magnetic recording medium 有权
标题翻译：用于磁记录的磁粉及其制造方法和磁记录介质
公开(公告)号：JP2012204726A
公开(公告)日：2012-10-22
申请号：JP2011069496
申请日：2011-03-28
申请人： Fujifilm Corp , 富士フイルム株式会社
发明人： YAMAZAKI NOBUO , TADA TOSHIO , SUZUKI HIROYUKI
IPC分类号： H01F1/11 , G11B5/706
CPC分类号： G11B5/70678 , H01F1/11
摘要： PROBLEM TO BE SOLVED: To provide means that can overcome trilemma of magnetic recording.SOLUTION: There is provided magnetic powder for magnetic recording of hexagonal ferrite magnetic particles. In the magnetic powder, only divalent elements of 0.5 to 5.0 atom% are contained as Fe substitution elements based on 100 atom% of an Fe content and an activation volume ranges from 1200 to 1800nm. Also provided is a method for manufacturing magnetic powder for magnetic recording. In this method, the hexagonal ferrite magnetic particles are obtained according to a glass crystallization method using a raw material mixture which contains only divalent element components as Fe substitution components, in which the content of the divalent elements ranges 0.5 to 5.0 atom% based on 100 atom% of the Fe-content. A magnetic recording medium has a magnetic layer containing the above magnetic powder for magnetic recording and a binder on a non-magnetic support.
摘要翻译：要解决的问题：提供能够克服磁记录的三重效果的手段。
解决方案：提供用于磁性记录六方晶系铁氧体磁性颗粒的磁粉。在磁性粉末中，作为Fe取代元素，只含有0.5〜5.0原子％的二价元素，以Fe原子计为100原子％，活化体积为1200〜1800nm。SP SP =“POST”> 3 >。还提供了一种制造用于磁记录的磁粉的方法。在该方法中，六方晶系铁氧体磁性颗粒是根据玻璃结晶法，使用仅含有二价元素成分的原料混合物作为Fe取代成分得到的，其中二价元素的含量基于100为0.5-5.0原子％原子％的Fe含量。磁记录介质具有磁性层，该磁性层含有用于磁记录的上述磁性粉末和非磁性载体上的粘合剂。版权所有（C）2013，JPO＆INPIT

6. 发明专利

JP2010080608A Method of manufacturing hexagonal ferrite magnetic powder, magnetic recording medium, and method of manufacturing the same 审中-公开
标题翻译：制造六角形铁素体磁粉的方法，磁记录介质及其制造方法
公开(公告)号：JP2010080608A
公开(公告)日：2010-04-08
申请号：JP2008245874
申请日：2008-09-25
申请人： Fujifilm Corp , 富士フイルム株式会社
发明人： TADA TOSHIO , YAMAZAKI NOBUO , MEGURO KATSUHIKO
IPC分类号： H01F1/11 , G11B5/706
摘要： PROBLEM TO BE SOLVED: To provide a hexagonal ferrite magnetic powder achieving a high S/N in high-density recording, and to provide a magnetic recording medium which employs the hexagonal ferrite magnetic powder and is suitable for high-density recording. SOLUTION: A method of manufacturing the hexagonal ferrite magnetic powder includes steps of: preparing a melt by melting a raw material mixture including a hexagonal ferrite-forming component and ≥30 mass% of a glass-forming component; quenching the melt to obtain an amorphous material; precipitating hexagonal ferrite magnetic particles by heat treatment of the amorphous material; performing wet pulverizing of the material obtained by the heat treatment, in an acid solution; and washing the result of wet pulverizing with water. By this method, the hexagonal ferrite magnetic powder having a specific surface area of ≤120 m 2 /g is manufactured. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供在高密度记录中获得高S / N的六方晶系铁氧体磁粉，并提供采用六方晶系铁氧体磁粉并适用于高密度记录的磁记录介质。解决方案：制造六方晶系铁氧体磁粉的方法包括以下步骤：通过熔融包含六方晶系铁素体形成组分的原料混合物和≥30质量％的玻璃形成组分来制备熔体; 淬火熔体以获得无定形材料; 通过非晶材料的热处理沉淀六方铁素体磁性颗粒; 在酸溶液中进行通过热处理获得的材料的湿法粉碎; 并用水洗涤湿粉碎的结果。通过该方法，制造比表面积为＆lt; 120m＆lt; SP＆gt; 2＆lt; / SP＆gt; / g的六方晶系铁氧体磁性粉末。版权所有（C）2010，JPO＆INPIT

7. 发明专利

JP2017117504A 磁気テープおよびその製造方法审中-公开
公开(公告)号：JP2017117504A
公开(公告)日：2017-06-29
申请号：JP2015254186
申请日：2015-12-25
申请人：富士フイルム株式会社 , Fujifilm Corp
发明人： TADA TOSHIO , KASADA NARUTO , KOYANAGI MASAHITO
IPC分类号： G11B5/68
CPC分类号： G11B5/714 , G11B5/7013 , G11B5/70678 , G11B5/708 , G11B5/712 , G11B5/78 , G11B5/845
摘要：【課題】優れた電磁変換特性を発揮することができ、かつ高温高湿環境下での保存後の摩擦係数の上昇が抑制された重層構成の磁気テープの提供。【解決手段】脂肪酸エステルを少なくとも磁性層に含み、磁性層に含まれる強磁性六方晶フェライト粉末は、X線回折分析により求められる結晶子体積が1000〜2400nm3の範囲であり、かつ結晶子サイズDx(107)と磁化容易軸方向粒子サイズDTEMとの比、Dx(107)/DTEM、が1.1以上であり、磁気テープ長手方向における式1:ΔSFD=SFD25℃−SFD−190℃により算出されるΔSFDが、0.50〜1.60の範囲である重層構成の磁気テープ。磁気テープの製造方法。式1中、SFD25℃は、温度25℃の環境下で磁気テープ長手方向において測定される反転磁界分布であり、SFD−190℃は、温度−190℃の環境下で磁気テープ長手方向において測定される反転磁界分布である。【選択図】なし

8. 发明专利

JP2014187293A Hexagonal ferrite magnetic powder, manufacturing method thereof, and magnetic recording medium 有权
标题翻译：六角形铁素体磁粉，其制造方法和磁记录介质
公开(公告)号：JP2014187293A
公开(公告)日：2014-10-02
申请号：JP2013062332
申请日：2013-03-25
申请人： Fujifilm Corp , 富士フイルム株式会社
发明人： SUZUKI HIROYUKI , TADA TOSHIO
IPC分类号： H01F1/11 , G11B5/706 , G11B5/714 , G11B5/84
CPC分类号： G11B5/70678 , H01F1/11 , Y10T428/2982
摘要： PROBLEM TO BE SOLVED: To provide means for materializing both of the reduction in size of particles of hexagonal ferrite magnetic powder to microparticles, and low SFD.SOLUTION: Hexagonal ferrite magnetic powder has an activation volume within a range of 900-1600 nm. In the hexagonal ferrite magnetic powder, the ratio (plate-thickness variation coefficient/particle-size variation coefficient) of a plate-thickness variation coefficient to a particle-size variation coefficient is within a range of 0.20-0.60.
摘要翻译：要解决的问题：提供将六方晶系铁氧体磁粉的颗粒尺寸减小到微粒和低SFD的方法。解决方案：六角铁氧体磁粉的活化体积在900-1600nm的范围内。在六方晶系铁氧体磁粉中，板厚变化系数与粒径变化系数的比（板厚变化系数/粒子大小变动系数）在0.20〜0.60的范围内。

9. 发明专利

JP2007294084A Magnetic recording medium, magnetic signal reproduction system, and magnetic signal reproducing method 审中-公开
标题翻译：磁记录介质，磁信号再现系统和磁信号再现方法
公开(公告)号：JP2007294084A
公开(公告)日：2007-11-08
申请号：JP2007095525
申请日：2007-03-30
申请人： Fujifilm Corp , 富士フイルム株式会社
发明人： TADA TOSHIO , HARASAWA KEN
IPC分类号： G11B5/706 , G11B5/714 , G11B5/78
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium having a satisfactory SNR in reproduction by a high sensitive MR head such as a highly sensitive AMR head and GMR head, in the magnetic recording medium having a thin magnetic layer. SOLUTION: The magnetic recording medium has a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support. The thickness δ of the magnetic layer is 10 to 80 nm, Mrδ defined as the product of residual magnetization Mr of the magnetic layer and the thickness δ of the magnetic layer is from 1 to 5 mA, and the ratio between the average area Sdc of a magnetic cluster in a DC demagnetized state and the average area Sac of a magnetic cluster in an AC demagnetized state as measured under a magnetic force microscope (MFM), i.e., Sdc/Sac, is in the range of 0.8 to 2.0. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：在具有薄磁性层的磁记录介质中，通过诸如高灵敏度AMR磁头和GMR磁头的高灵敏度MR磁头提供具有令人满意的SNR的磁记录介质。解决方案：磁记录介质具有在非磁性载体上含有铁磁性粉末和粘合剂的磁性层。磁性层的厚度δ为10〜80nm，作为磁性层的剩余磁化强度Mr和磁性层的厚度δ的乘积的Mrδ定义为1〜5mA，平均面积Sdc 在DC去磁状态下的磁簇和在磁力显微镜（MFM）（即Sdc / Sac）下测量的交流去磁状态下的磁簇的平均面积Sac在0.8至2.0的范围内。版权所有（C）2008，JPO＆INPIT

10. 发明专利

JP2019021365A 磁気テープ审中-公开
公开(公告)号：JP2019021365A
公开(公告)日：2019-02-07
申请号：JP2017140024
申请日：2017-07-19
申请人： FUJIFILM CORP
发明人： OZAWA EIKI , TADA TOSHIO , KASADA NARUTO , KUROKAWA TAKUTO
IPC分类号： G11B5/735 , G11B5/70 , G11B5/706 , G11B5/738 , G11B5/78
摘要：【課題】磁性層の表面において測定される中心線平均表面粗さが1.8nm以下であってエッジダメージの発生が抑制された磁気テープの提供。【解決手段】磁性層の表面において測定される中心線平均表面粗さは1.8nm以下、In−Plane法を用いた磁性層のX線回折分析により求められる六方晶フェライト結晶構造の(114)面の回折ピークのピーク強度に対する(110)面の回折ピークのピーク強度は0.5以上4.0以下、磁気テープの垂直方向角型比は0.65以上1.00以下、バックコート層に脂肪酸エステルを含み、磁気テープを真空加熱する前および後にバックコート層の表面において光学干渉法により測定されるスペーシング分布の半値全幅は0nm超かつ10.0nm以下、かつ真空加熱前後にバックコート層の表面において光学干渉法により測定されるスペーシングの差分は0nm超かつ8.0nm以下である磁気テープ。【選択図】なし

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