公开(公告)号：US07271981B2

公开(公告)日：2007-09-18

申请号：US10718430

申请日：2003-11-20

申请人： Ganping Ju ,  Duane Karns ,  Thomas F. Ambrose ,  Rene Johannes Marinus van de Veerdonk

发明人： Ganping Ju ,  Duane Karns ,  Thomas F. Ambrose ,  Rene Johannes Marinus van de Veerdonk

IPC分类号： G11B5/127

CPC分类号： G11C11/1675 ,  G11B11/10534 ,  G11B2005/0008 ,  G11B2005/0021 ,  G11B2005/0034 ,  G11C11/161

摘要： A magnetic field transducer includes a phase transition material exhibiting a change from an antiferromagnetic phase to a ferromagnetic phase when heated above a critical temperature, means for applying a magnetic bias field to the phase transition material, and means for heating the phase transition material above the critical temperature. Magnetic recording heads that include the transducer and magnetic disc drives that include the magnetic recording heads are also described. A method of producing a magnetic field pulse including applying a magnetic bias field to a phase transition material, and heating the phase transition material to cause the phase transition material to change from an antiferromagnetic phase to a ferromagnetic phase, is also provided. The phase transition material can comprise a rare earth-transition metal alloy, where the alloy is heated above a compensation temperature.

摘要翻译： 磁场换能器包括在加热到高于临界温度时表现出从反铁磁相到铁磁相的变化的相变材料，用于向相变材料施加磁偏置场的装置，以及用于加热相转变材料上方的相变材料的装置 临界温度。 还描述了包括换能器和包括磁记录头的磁盘驱动器的磁记录头。 还提供了一种产生磁场脉冲的方法，包括对相变材料施加磁偏置场，并加热相变材料以使相变材料从反铁磁相变为铁磁相。 相变材料可以包括稀土 - 过渡金属合金，其中合金被加热到高于补偿温度。

公开(公告)号：US20050111137A1

公开(公告)日：2005-05-26

申请号：US10718430

申请日：2003-11-20

申请人： Ganping Ju ,  Duane Karns ,  Thomas Ambrose ,  Rene Johannes Marinus van de Veerdonk

发明人： Ganping Ju ,  Duane Karns ,  Thomas Ambrose ,  Rene Johannes Marinus van de Veerdonk

IPC分类号： G11B5/00 ,  G11B5/147 ,  G11B11/105 ,  G11C11/16

CPC分类号： G11C11/1675 ,  G11B11/10534 ,  G11B2005/0008 ,  G11B2005/0021 ,  G11B2005/0034 ,  G11C11/161

摘要： A magnetic field transducer includes a phase transition material exhibiting a change from an antiferromagnetic phase to a ferromagnetic phase when heated above a critical temperature, means for applying a magnetic bias field to the phase transition material, and means for heating the phase transition material above the critical temperature. Magnetic recording heads that include the transducer and magnetic disc drives that include the magnetic recording heads are also described. A method of producing a magnetic field pulse including applying a magnetic bias field to a phase transition material, and heating the phase transition material to cause the phase transition material to change from an antiferromagnetic phase to a ferromagnetic phase, is also provided. The phase transition material can comprise a rare earth-transition metal alloy, where the alloy is heated above a compensation temperature.

摘要翻译： 磁场换能器包括在加热到高于临界温度时表现出从反铁磁相到铁磁相的变化的相变材料，用于向相变材料施加磁偏置场的装置，以及用于加热相转变材料上方的相变材料的装置 临界温度。 还描述了包括换能器和包括磁记录头的磁盘驱动器的磁记录头。 还提供了一种产生磁场脉冲的方法，包括对相变材料施加磁偏置场，并加热相变材料以使相变材料从反铁磁相变为铁磁相。 相变材料可以包括稀土 - 过渡金属合金，其中合金被加热到高于补偿温度。

公开(公告)号：US08264788B2

公开(公告)日：2012-09-11

申请号：US12390592

申请日：2009-02-23

申请人： Kaizhong Gao ,  Michael Allen Seigler ,  Xuhui Jin ,  Ganping Ju ,  Bin Lu

发明人： Kaizhong Gao ,  Michael Allen Seigler ,  Xuhui Jin ,  Ganping Ju ,  Bin Lu

IPC分类号： G11B5/02

CPC分类号： G11B5/314 ,  B82Y10/00 ,  G11B5/743 ,  G11B5/855 ,  G11B2005/001 ,  G11B2005/0021

摘要： An apparatus includes a recording media including a substrate, a plurality of tracks of magnetic material on the substrate, and a non-magnetic material between the tracks; a recording head having an air bearing surface positioned adjacent to the recording media, and including a magnetic pole, an optical transducer, and a near-field transducer, wherein the near-field transducer directs electromagnetic radiation onto tracks to heat portions of the tracks and a magnetic field from the magnetic pole is used to create magnetic transitions in the heated portions of the tracks; and a plasmonic material positioned adjacent to the magnetic material to increase coupling between the electromagnetic radiation and the magnetic material.

摘要翻译： 一种设备包括：记录介质，包括基板，多个基板上的磁性材料轨迹，以及轨道之间的非磁性材料; 记录头，其具有邻近记录介质定位的空气轴承表面，并且包括磁极，光学换能器和近场换能器，其中近场换能器将电磁辐射引导到轨道上以加热轨道的部分， 来自磁极的磁场用于在轨道的加热部分中产生磁转变; 以及与磁性材料相邻定位的等离子体元件，以增加电磁辐射与磁性材料之间的耦合。

公开(公告)号：US20100200124A1

公开(公告)日：2010-08-12

申请号：US12369844

申请日：2009-02-12

申请人： Jiaoming Qiu ,  Yonghua Chen ,  Ganping Ju

发明人： Jiaoming Qiu ,  Yonghua Chen ,  Ganping Ju

IPC分类号： C21D1/26

CPC分类号： B32B15/018 ,  C21D1/26 ,  G11B5/653 ,  G11B5/84

摘要： A method includes: constructing a multilayer structure including a first layer of Pt, a first layer of A1 phase FePt on the first layer of Pt, and a second layer of Pt on the layer of FePt, and annealing the multilayer structure to convert the A1 phase FePt to L10 phase FePt.

摘要翻译： 一种方法包括：构造包括Pt的第一层，Pt的第一层上的第一Al层FePt层和FePt层上的第二层Pt的多层结构，并退火该多层结构以转化A1 相FePt至L10相FePt。

公开(公告)号：US07595959B2

公开(公告)日：2009-09-29

申请号：US11170035

申请日：2005-06-29

申请人： Mark William Covington ,  Ganping Ju ,  Werner Scholz ,  Michael Kevin Minor

发明人： Mark William Covington ,  Ganping Ju ,  Werner Scholz ,  Michael Kevin Minor

IPC分类号： G11B5/127

CPC分类号： G11B5/667 ,  G11B5/1278 ,  G11B5/581 ,  G11B5/6005 ,  Y10T428/115 ,  Y10T428/1186

摘要： A magnetic recording system is disclosed in which the magnetization dynamics of the write head and recording medium are highly damped. The system may comprise a perpendicular recording head having a write pole, and a recording medium including a hard magnetic recording layer and a soft magnetic underlayer (SUL). The increased magnetic damping in the write pole and SUL suppresses precessional motion of the respective magnetizations, leading to a reduction in transition jitter caused by spurious head field fluctuations. The damping may be increased by providing films or multilayer structures that are doped with rare earth or transition metal elements. Exchange coupled laminates of doped and undoped layers may optimize both the effective damping and write field in the recording system.

摘要翻译： 公开了一种磁记录系统，其中写头和记录介质的磁化动力学被高度阻尼。 该系统可以包括具有写入极的垂直记录头和包括硬磁记录层和软磁性底层（SUL）的记录介质。 写入磁极和SUL中的增加的磁阻抑制了相应磁化的进动运动，导致由杂散磁头场波动引起的转换抖动的减小。 可以通过提供掺杂有稀土或过渡金属元素的膜或多层结构来增加阻尼。 掺杂和未掺杂层的交换耦合层压板可以优化记录系统中的有效阻尼和写入场。

公开(公告)号：US20070172705A1

公开(公告)日：2007-07-26

申请号：US11336799

申请日：2006-01-20

申请人： Dieter Weller ,  Edward Gage ,  Ganping Ju ,  Bin Lu

发明人： Dieter Weller ,  Edward Gage ,  Ganping Ju ,  Bin Lu

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  G11B5/65 ,  Y10T428/25 ,  Y10T428/2982 ,  Y10T428/32 ,  Y10T428/325

摘要： A thin film structure comprises a first layer including a first plurality of grains of magnetic material having a first intergranular exchange coupling, and a second layer positioned adjacent to the first layer and including a second plurality of grains of magnetic material having a second intergranular exchange coupling, wherein the second intergranular exchange coupling is larger than the first intergranular exchange coupling and wherein the Curie temperature of the first layer is greater than the Curie temperature of the second layer. A data storage system including the thin film structure is also provided.

摘要翻译： 薄膜结构包括第一层，其包括具有第一晶间交换耦合的第一多个磁性材料颗粒和邻近第一层定位的第二层，并且包括具有第二晶间交换耦合的第二多个磁性材料颗粒 ，其中所述第二晶间交换耦合大于所述第一晶间交换耦合，并且其中所述第一层的居里温度大于所述第二层的居里温度。 还提供了包括薄膜结构的数据存储系统。

公开(公告)号：US07166997B2

公开(公告)日：2007-01-23

申请号：US10679905

申请日：2003-10-06

申请人： Ganping Ju ,  Roy W. Chantrell ,  Hong Zhou ,  Dieter K. Weller

发明人： Ganping Ju ,  Roy W. Chantrell ,  Hong Zhou ,  Dieter K. Weller

IPC分类号： G01R33/02

CPC分类号： G01R33/1207 ,  G01R33/0325

摘要： A method and apparatus for determining volume and anisotropy field distribution of thin film granular material includes the use of a magneto-optic probe, a lock-in amplifier, and a computer. The magneto-optic probe utilizes the Kerr effect in order to determine the transverse AC susceptibility of the sample. The Lock-in amplifier determines the complex parameters of the susceptibility as a function of the DC field and AC frequency. Separate distribution values of anisotropy field and grain volume can then be determined mathematically from the relationship of complex susceptibility parameters to the DC field strength.

摘要翻译： 用于确定薄膜颗粒材料的体积和各向异性场分布的方法和装置包括使用磁光探针，锁定放大器和计算机。 磁光探针利用克尔效应来确定样品的横向AC敏感性。 锁定放大器确定作为直流电场和交流频率的函数的磁化率的复杂参数。 然后可以从复合磁化率参数与直流场强度的关系数学地确定各向异性场和晶粒体积的分离值。

公开(公告)号：US20050106422A1

公开(公告)日：2005-05-19

申请号：US10717107

申请日：2003-11-19

申请人： Bin Lu ,  Dieter Weller ,  Ganping Ju ,  Jai-Young Kim

发明人： Bin Lu ,  Dieter Weller ,  Ganping Ju ,  Jai-Young Kim

IPC分类号： B05D5/12 ,  B32B5/16 ,  G11B5/64 ,  G11B5/84

CPC分类号： G11B5/65 ,  G11B5/84 ,  Y10T428/256 ,  Y10T428/257

摘要： The invention includes improving or enhancing exchange coupling within a thin film layer. The improvement or enhancement to the exchange coupling occurs between the grains that are deposited to form the thin film. The improvement or enhancement to the exchange coupling between the grains of the thin film results from annealing the thin film at an elevated temperature for a period of time. A thin film structure and/or a magnetic recording layer made in accordance with the invention are disclosed.

摘要翻译： 本发明包括改善或增强薄膜层内的交换耦合。 在沉积以形成薄膜的晶粒之间发生交换耦合的改进或增强。 对薄膜晶粒之间的交换耦合的改善或增强是由于在高温下将薄膜退火一段时间。 公开了根据本发明制成的薄膜结构和/或磁记录层。

公开(公告)号：US08576672B1

公开(公告)日：2013-11-05

申请号：US13481207

申请日：2012-05-25

申请人： Chubing Peng ,  Edward Charles Gage ,  Ganping Ju ,  Jan-Ulrich Thiele ,  Kaizhong Gao

发明人： Chubing Peng ,  Edward Charles Gage ,  Ganping Ju ,  Jan-Ulrich Thiele ,  Kaizhong Gao

IPC分类号： G11B11/00

CPC分类号： G11B5/7325 ,  G11B2005/0021

摘要： A layer configured for use in a magnetic stack has electrical resistivity greater than about 5×10−8 Ωm and thermal conductivity greater than about 1 W/mK. In some arrangements, the magnetic stack includes a substrate with the layer disposed over the substrate, a magnetic recording layer disposed over the layer, and a thermal resist layer disposed between the layer and the magnetic recording layer. In some arrangements, the layer is configured to function as a heat sink and a soft under layer. A system that incorporates the layer can include a magnetic write pole, a near field transducer (NFT) positioned proximate the write pole that radiates energy.

摘要翻译： 配置用于磁性堆叠的层具有大于约5×10 -8Ωgam的电阻率和大于约1W / mK的热导率。 在一些布置中，磁性堆叠包括具有设置在衬底上的层的衬底，设置在层上的磁记录层，以及设置在层和磁记录层之间的热阻层。 在一些布置中，该层被配置为用作散热器和软底层。 结合该层的系统可以包括磁性写入磁极，靠近写入磁极的辐射能量的近场传感器（NFT）。

公开(公告)号：US08268462B2

公开(公告)日：2012-09-18

申请号：US12341245

申请日：2008-12-22

申请人： Yingguo Peng ,  Ganping Ju

发明人： Yingguo Peng ,  Ganping Ju

IPC分类号： G11B5/66

CPC分类号： G11B5/74 ,  B82Y10/00 ,  G11B5/65 ,  G11B5/743 ,  G11B5/746 ,  G11B5/851 ,  H01F1/06 ,  H01F10/123 ,  H01F10/16 ,  H01F41/18

摘要： Magnetic layers are described that include the use of magnetic grains and non-magnetic grain boundaries with hybrid additives. Hybrid additives include the use of at least two different additives in the composition of the grain boundaries of a magnetic layer in magnetic recording media. The use of hybrid additives in the grain boundaries results in improved recording media. Methods for forming magnetic layers and magnetic recording media with the hybrid additive grain boundaries are also described.

摘要翻译： 描述了包括使用磁性颗粒和非磁性晶界与混合添加剂的磁性层。 混合添加剂包括在磁记录介质中在磁性层的晶界组成中使用至少两种不同的添加剂。 在晶界中使用混合添加剂导致改进的记录介质。 还描述了用于形成具有混合添加剂晶界的磁性层和磁记录介质的方法。