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    • 4. 发明授权
    • Perpendicular magnetic recording medium and system with low-curie-temperature multilayer for heat-assisted writing and/or reading
    • 垂直磁记录介质和具有低Curie-temperature多层的系统,用于热辅助写入和/或读取
    • US07862912B2
    • 2011-01-04
    • US12041930
    • 2008-03-04
    • Olav HellwigBruce David TerrisJan-Ulrich Thiele
    • Olav HellwigBruce David TerrisJan-Ulrich Thiele
    • G11B5/66
    • G11B5/66Y10T428/1171
    • A perpendicular magnetic recording medium, usable for either continuous or patterned media, has a recording layer structure (RLS) of first and second perpendicular magnetic layers (PM1, PM2) and an antiferromagnetically coupling (AFC) layer and a ferromagnetic switching layer (SWL) between PM1 and PM2. The magnetic recording system uses heat to assist in the reading and/or writing of data. The SWL is a Co/Ni multilayer with a Curie temperature (TC-SWL) less than the Curie temperatures of PM1 and PM2. At room temperature, there is ferromagnetic coupling between SWL and the upper ferromagnetic layer (PM2) so that the magnetizations of SWL and PM2 are parallel, and antiferromagnetic coupling between SWL and the lower ferromagnetic layer (PM1) across the AFC layer so that the magnetization of PM1 is aligned antiparallel to the magnetizations of SWL and PM2. When the SWL is heated to above TC-SWL it is no longer ferromagnetic, there is no antiferromagnetic coupling between the SWL and PM1 across the AFC layer, and the magnetizations of PM1 and PM2 become aligned parallel.
    • 可用于连续或图案化介质的垂直磁记录介质具有第一和第二垂直磁性层(PM1,PM2)和反铁磁耦合(AFC)层和铁磁性切换层(SWL)的记录层结构(RLS) PM1和PM2之间。 磁记录系统使用热量来辅助读取和/或写入数据。 SWL是具有低于PM1和PM2的居里温度的居里温度(TC-SWL)的Co / Ni多层。 在室温下,在SWL和上铁磁层(PM2)之间存在铁磁耦合,使得SWL和PM2的磁化平行,并且SWL与AFC层之间的下铁磁层(PM1)之间的反铁磁耦合,使得磁化 的PM1与SWL和PM2的磁化反平行排列。 当SWL被加热到高于TC-SWL时,它不再是铁磁性的,在AFC层之间的SWL和PM1之间没有反铁磁耦合,并且PM1和PM2的磁化平行排列。
    • 5. 发明申请
    • PERPENDICULAR MAGNETIC RECORDING MEDIUM AND SYSTEM WITH LOW-CURIE-TEMPERATURE MULTILAYER FOR HEAT-ASSISTED WRITING AND/OR READING
    • 具有低温度温度的多层磁性记录介质和系统,用于热辅助写入和/或读取
    • US20090226762A1
    • 2009-09-10
    • US12041930
    • 2008-03-04
    • Olav HellwigBruce David TerrisJan-Ulrich Thiele
    • Olav HellwigBruce David TerrisJan-Ulrich Thiele
    • G11B5/65
    • G11B5/66Y10T428/1171
    • A perpendicular magnetic recording medium, usable for either continuous or patterned media, has a recording layer structure (RLS) of first and second perpendicular magnetic layers (PM1, PM2) and an antiferromagnetically coupling (AFC) layer and a ferromagnetic switching layer (SWL) between PM1 and PM2. The magnetic recording system uses heat to assist in the reading and/or writing of data. The SWL is a Co/Ni multilayer with a Curie temperature (TC-SWL) less than the Curie temperatures of PM1 and PM2. At room temperature, there is ferromagnetic coupling between SWL and the upper ferromagnetic layer (PM2) so that the magnetizations of SWL and PM2 are parallel, and antiferromagnetic coupling between SWL and the lower ferromagnetic layer (PM1) across the AFC layer so that the magnetization of PM1 is aligned antiparallel to the magnetizations of SWL and PM2. When the SWL is heated to above TC-SWL it is no longer ferromagnetic, there is no antiferromagnetic coupling between the SWL and PM1 across the AFC layer, and the magnetizations of PM1 and PM2 become aligned parallel.
    • 可用于连续或图案化介质的垂直磁记录介质具有第一和第二垂直磁性层(PM1,PM2)和反铁磁耦合(AFC)层和铁磁性切换层(SWL)的记录层结构(RLS) PM1和PM2之间。 磁记录系统使用热量来辅助读取和/或写入数据。 SWL是具有低于PM1和PM2的居里温度的居里温度(TC-SWL)的Co / Ni多层。 在室温下,在SWL和上铁磁层(PM2)之间存在铁磁耦合,使得SWL和PM2的磁化平行,并且SWL与AFC层之间的下铁磁层(PM1)之间的反铁磁耦合,使得磁化 的PM1与SWL和PM2的磁化反平行排列。 当SWL被加热到高于TC-SWL时,它不再是铁磁性的,在AFC层之间的SWL和PM1之间没有反铁磁耦合,并且PM1和PM2的磁化平行排列。
    • 8. 发明授权
    • Thermally-assisted perpendicular magnetic recording system and head
    • 热辅助垂直磁记录系统和头
    • US07068453B2
    • 2006-06-27
    • US10789907
    • 2004-02-27
    • Bruce David TerrisJan-Ulrich Thiele
    • Bruce David TerrisJan-Ulrich Thiele
    • G11B5/02
    • G11B5/315G11B5/1278G11B5/314G11B5/3967G11B2005/0021
    • A thermally-assisted perpendicular magnetic recording head includes a write pole tip for generating a magnetic write field in the perpendicular magnetic recording layer, a magnetic shield that confines the write field essentially to the data track to be recorded, an electrically resistive heater for heating the recording layer in the presence of the write field, and a return pole. The write pole tip width essentially defines data track width and is substantially surrounded by the magnetic shield. The shield may include side shields with ends located on opposite sides of the write pole tip and a trailing shield having an end spaced from the write pole tip. The resistive heater is wider than the data track and heats both the data track and adjacent tracks, but thermally-assisted magnetic recording occurs only in the data track because the confined magnetic field in the adjacent tracks is less than the required write field.
    • 热辅助垂直磁记录头包括用于在垂直磁记录层中产生磁写入场的写磁极端头,将写磁场基本上限制于要记录的数据磁道的磁屏蔽,用于加热 在存在写字段的情况下,记录层和返回极。 写极尖宽度基本上限定数据磁道宽度并且基本上被磁屏蔽包围。 屏蔽件可以包括端部位于写入磁极尖端的相对侧上的侧部屏蔽件,以及具有与写入磁极尖端间隔开的端部的后屏蔽件。 电阻加热器比数据轨道宽,并加热数据轨道和相邻轨道,但热辅助磁记录仅发生在数据轨道中,因为相邻轨道中的受限磁场小于所需的写入场。
    • 10. 发明授权
    • Method for making horizontal magnetic recording media having grains of
chemically-ordered FePt or CoPt
    • 制造具有化学有序FePt或CoPt晶粒的水平磁记录介质的方法
    • US6007623A
    • 1999-12-28
    • US920550
    • 1997-08-29
    • Jan-Ulrich ThieleDieter Klaus Weller
    • Jan-Ulrich ThieleDieter Klaus Weller
    • G11B5/64G11B5/73G11B5/84G11B5/851C30B23/00
    • G11B5/732G11B5/653G11B5/656G11B5/8404G11B5/851
    • A method for producing a horizontal magnetic recording medium that has as its magnetic film a granular film with grains of a chemically-ordered FePt or FePtX (or CoPt or CoPtX) alloy in the tetragonal L1.sub.0 structure uses an etched seed layer beneath the granular film. The granular magnetic film reveals a very high magnetocrystalline anisotropy within the individual grains. The film is produced by sputtering from a single alloy target or cosputtering from several targets. The granular structure and the chemical ordering are controlled by means of sputter parameters, e.g., temperature and deposition rate, and by the use of the etched seed layer that provides a structure for the subsequently sputter-deposited granular magnetic film. The structure of the seed layer is obtained by sputter etching, plasma etching, ion irradiation, or laser irradiation. The magnetic properties, i.e., H.sub.c and areal moment density M.sub.r t, are controlled by the granularity (grain size and grain distribution), the degree of chemical ordering, and the addition of one or more nonmagnetic materials, such as Cr, Ag, Cu, Ta, or B. The resulting granular magnetic film has magnetic properties suitable for application in high-density, horizontal magnetic recording media.
    • 在四方晶L10结构中使用具有化学有序FePt或FePtX(或CoPt或CoPtX)合金晶粒的颗粒膜作为其磁性膜的水平磁记录介质的制造方法使用粒状膜下方的蚀刻种子层。 颗粒状磁性膜显示各晶粒内的非常高的磁晶各向异性。 该膜通过从单个合金靶溅射或从几个靶的共溅射制造。 颗粒结构和化学排序通过溅射参数(例如温度和沉积速率)以及通过使用提供随后溅射沉积的颗粒状磁性膜的结构的蚀刻种子层来控制。 种子层的结构通过溅射蚀刻,等离子体蚀刻,离子照射或激光照射获得。 磁特性,即Hc和面积密度Mrt由颗粒度(晶粒尺寸和晶粒分布),化学排序程度以及添加一种或多种非磁性材料如Cr,Ag,Cu, Ta或B.所得粒状磁性膜具有适用于高密度水平磁记录介质的磁性能。