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1. 发明授权

US08881378B2 Method to improve performance of a magneto-resistive (MR) sensor 有权
标题翻译：提高磁阻（MR）传感器性能的方法
公开(公告)号：US08881378B2
公开(公告)日：2014-11-11
申请号：US13199183
申请日：2011-08-22
申请人： Yuchen Zhou , Joe Smyth , Min Li , Glen Garfunkel
发明人： Yuchen Zhou , Joe Smyth , Min Li , Glen Garfunkel
IPC分类号： G11B5/127 , H04R31/00 , G01R33/09 , B32B38/10 , B32B37/02
CPC分类号： G01R33/098 , B32B37/02 , B32B38/10 , B32B2307/212 , B32B2309/105 , B32B2457/08 , Y10T29/49043 , Y10T29/49044 , Y10T29/49046 , Y10T29/49048 , Y10T29/49052
摘要： A method is described to improve performance of a magneto-resistive (MR) sensor under conditions of high areal density. The free layer is partially etched away, the removed material being replaced by a magnetic flux guide structure that reduces the free layer's demagnetization field. This in turn reduces the stripe height of the sensor so that the resolution and the read-back signal are enhanced without increasing noise and instability.
摘要翻译：描述了一种在高密度密度条件下提高磁阻（MR）传感器性能的方法。自由层被部分地蚀刻掉，去除的材料被减少自由层去磁场的磁通引导结构代替。这又降低了传感器的条带高度，从而增强了分辨率和回读信号，而不增加噪声和不稳定性。

2. 发明申请

US20130049747A1 MR sensor with back edge flux guide 有权
标题翻译：具有后缘磁通导向器的MR传感器
公开(公告)号：US20130049747A1
公开(公告)日：2013-02-28
申请号：US13199183
申请日：2011-08-22
申请人： Yuchen Zhou , Joe Smyth , Min Li , Glen Garfunkel
发明人： Yuchen Zhou , Joe Smyth , Min Li , Glen Garfunkel
IPC分类号： G01R33/09 , B32B37/14 , B32B38/08 , B32B38/10 , B32B38/00
CPC分类号： G01R33/098 , B32B37/02 , B32B38/10 , B32B2307/212 , B32B2309/105 , B32B2457/08 , Y10T29/49043 , Y10T29/49044 , Y10T29/49046 , Y10T29/49048 , Y10T29/49052
摘要： An MR sensor, and a method for making it, is described. Part of the MR stack, from the free layer on up, is removed and then replaced by a flux guide. Additional stabilizing means for this flux guide are provided, either as hard bias or through exchange coupling.
摘要翻译：描述MR传感器及其制造方法。去除自由层上的MR堆叠的一部分，然后用助焊剂代替。提供用于该磁通引导件的附加稳定装置，作为硬偏置或通过交换耦合。

3. 发明授权

US08477453B2 Perpendicular magnetic recording write head with milling defined track width 有权
标题翻译：垂直磁记录写头具有铣削定义的轨道宽度
公开(公告)号：US08477453B2
公开(公告)日：2013-07-02
申请号：US12799927
申请日：2010-05-05
申请人： Kenichi Takano , Yuchen Zhou , Min Li , Joe Smyth
发明人： Kenichi Takano , Yuchen Zhou , Min Li , Joe Smyth
IPC分类号： G11B5/31
CPC分类号： G11B5/1278 , G11B5/3116 , G11B5/314 , G11B5/315 , G11B5/3163 , G11B2005/0024
摘要： A main pole layer having at least a leading taper and trimmed pole tip portion is described. The leading taper increases head field up to ≧15000 Oe even for narrow track widths approaching 50 nm. For MAMR applications, a STO and trailing shield are sequentially formed on a trailing pole tip side. Furthermore, full side shields may be added to reduce fringing field. Another embodiment involves including both of a leading taper and trailing taper at the pole tip where leading taper angle is between 20° and 60° and trailing taper angle is from 10° to 45°. A method is provided for forming various embodiments of the present invention. A key feature is that milling depth at an effective neck height distance is greater than or equal to the pole tip thickness. A self aligned STO may be formed by the same ion milling step that defines track width.
摘要翻译：描述了至少具有前导锥形和微调极尖部分的主极层。即使对于接近50nm的窄轨道宽度，领先的锥形也增加了头部场>达15000 Oe。对于MAMR应用，STO和后屏蔽依次形成在尾极端侧。此外，可以添加全侧屏蔽以减少边缘场。另一实施例涉及在极尖处包括前导锥形和后锥形两者，其中前锥度角在20°至60°之间，后锥角度为10°至45°。提供了一种用于形成本发明的各种实施例的方法。一个关键特征是在有效颈部高度距离处的铣削深度大于或等于极尖厚度。可以通过定义轨道宽度的相同离子铣削步骤形成自对准STO。

4. 发明授权

US09222994B2 Perpendicular spin torque oscillator FMR frequency measurement method 有权
标题翻译：垂直自旋转矩振荡器FMR频率测量方法
公开(公告)号：US09222994B2
公开(公告)日：2015-12-29
申请号：US13200148
申请日：2011-09-19
申请人： Yuchen Zhou , Kunliang Zhang , Min Li , Kenichi Takano , Joe Smyth , Moris Dovek , Akihiko Takeo , Tomomi Funayama , Masahiro Takashita , Masayuki Takagishi
发明人： Yuchen Zhou , Kunliang Zhang , Min Li , Kenichi Takano , Joe Smyth , Moris Dovek , Akihiko Takeo , Tomomi Funayama , Masahiro Takashita , Masayuki Takagishi
IPC分类号： G01R23/02 , G01R33/12 , G11B5/39 , H01L43/08 , G11C11/16
CPC分类号： G01R33/1284 , G11B5/3903 , G11C11/161 , G11C11/1673 , G11C11/1675 , H01L43/08
摘要： A method for measuring the frequency in a spin torque oscillator having at least a magnetic oscillation layer (MOL), junction layer, and magnetic reference layer (MRL) is disclosed. In a first embodiment, a small in-plane magnetic field is applied to the STO after a DC current is applied to excite the MOL into an oscillation state. The MRL has a perpendicular magnetization that is tilted slightly to give an in-plane magnetization component to serve as a reference layer for measuring the oscillation frequency of the MOL in-plane magnetization component. An AC voltage change is produced in the DC current as a result of variable STO resistance and directly correlates to MOL oscillation frequency. Alternatively, a field having both perpendicular and in-plane components may be applied externally or by forming the STO between two magnetic poles thereby producing an in-plane magnetization reference component in the MRL.
摘要翻译：公开了一种用于测量至少具有磁振荡层（MOL），结层和磁参考层（MRL）的自旋转矩振荡器中的频率的方法。在第一实施例中，在施加DC电流以将MOL激发到振荡状态之后，将小的面内磁场施加到STO。 MRL具有稍微倾斜的垂直磁化，以产生面内磁化分量，用作用于测量MOL面内磁化分量的振荡频率的参考层。作为可变STO电阻的结果，在DC电流中产生AC电压变化，并直接与MOL振荡频率相关。或者，具有垂直和平面内部分量的场可以在外部施加，或者通过在两个磁极之间形成STO，从而在MRL中产生面内磁化参考分量。

5. 发明申请

US20130069626A1 Perpendicular spin torque oscillator FMR frequency measurement method 有权
公开(公告)号：US20130069626A1
公开(公告)日：2013-03-21
申请号：US13200148
申请日：2011-09-19
申请人： Yuchen Zhou , Kunliang Zhang , Min Li , Kenichi Takano , Joe Smyth , Moris Dovek , Akihiko Takeo , Tomomi Funayama , Masahiro Takashita , Masayuki Takagishi
发明人： Yuchen Zhou , Kunliang Zhang , Min Li , Kenichi Takano , Joe Smyth , Moris Dovek , Akihiko Takeo , Tomomi Funayama , Masahiro Takashita , Masayuki Takagishi
IPC分类号： G01R23/02
CPC分类号： G01R33/1284 , G11B5/3903 , G11C11/161 , G11C11/1673 , G11C11/1675 , H01L43/08
摘要： A method for measuring the frequency in a spin torque oscillator having at least a magnetic oscillation layer (MOL), junction layer, and magnetic reference layer (MRL) is disclosed. In a first embodiment, a small in-plane magnetic field is applied to the STO after a DC current is applied to excite the MOL into an oscillation state. The MRL has a perpendicular magnetization that is tilted slightly to give an in-plane magnetization component to serve as a reference layer for measuring the oscillation frequency of the MOL in-plane magnetization component. An AC voltage change is produced in the DC current as a result of variable STO resistance and directly correlates to MOL oscillation frequency. Alternatively, a field having both perpendicular and in-plane components may be applied externally or by forming the STO between two magnetic poles thereby producing an in-plane magnetization reference component in the MRL.

6. 发明申请

US20110273800A1 Perpendicular magnetic recording write head with milling defined track width 有权
标题翻译：垂直磁记录写头具有铣削定义的轨道宽度
公开(公告)号：US20110273800A1
公开(公告)日：2011-11-10
申请号：US12799927
申请日：2010-05-05
申请人： Kenichi Takano , Yuchen Zhou , Min Li , Joe Smyth
发明人： Kenichi Takano , Yuchen Zhou , Min Li , Joe Smyth
IPC分类号： G11B5/127 , C23C14/46
CPC分类号： G11B5/1278 , G11B5/3116 , G11B5/314 , G11B5/315 , G11B5/3163 , G11B2005/0024
摘要： A main pole layer having at least a leading taper and trimmed pole tip portion is described. The leading taper increases head field up to ≧15000 Oe even for narrow track widths approaching 50 nm. For MAMR applications, a STO and trailing shield are sequentially formed on a trailing pole tip side. Furthermore, full side shields may be added to reduce fringing field. Another embodiment involves including both of a leading taper and trailing taper at the pole tip where leading taper angle is between 20° and 60° and trailing taper angle is from 10° to 45°. A method is provided for forming various embodiments of the present invention. A key feature is that milling depth at an effective neck height distance is greater than or equal to the pole tip thickness. A self aligned STO may be formed by the same ion milling step that defines track width.
摘要翻译：描述了至少具有前导锥形和微调极尖部分的主极层。即使对于接近50nm的窄轨道宽度，前导锥形也增加了顶场至≧15000 Oe。对于MAMR应用，STO和后屏蔽依次形成在尾极端侧。此外，可以添加全侧屏蔽以减少边缘场。另一实施例涉及在极尖处包括前导锥形和后锥形两者，其中前锥度角在20°至60°之间，后锥角度为10°至45°。提供了一种用于形成本发明的各种实施例的方法。一个关键特征是在有效颈部高度距离处的铣削深度大于或等于极尖厚度。可以通过定义轨道宽度的相同离子铣削步骤形成自对准STO。

7. 发明授权

US08446692B2 Perpendicular magnetic recording head laminated with AFM-FM phase change material 有权
标题翻译：垂直磁记录头与AFM-FM相变材料层压
公开(公告)号：US08446692B2
公开(公告)日：2013-05-21
申请号：US13199188
申请日：2011-08-22
申请人： Yuchen Zhou , Kenichi Takano , Kowang Liu , Kunliang Zhang , Liejie Guan , Moris Dovek , Joe Smyth
发明人： Yuchen Zhou , Kenichi Takano , Kowang Liu , Kunliang Zhang , Liejie Guan , Moris Dovek , Joe Smyth
IPC分类号： G11B5/127 , G11B5/147
CPC分类号： G11B5/3113 , G11B5/1278 , G11B5/147 , G11B5/3146 , Y10T29/49032 , Y10T29/49034 , Y10T29/49043 , Y10T29/49044
摘要： A PMR writer is disclosed that minimizes pole erasure during non-writing and maximize write field during writing through an AFM-FM phase change material that is in an anti-ferromagnetic (AFM) state during non-writing and switches to a ferromagnetic (FM) state by heating during writing. The main pole layer including the write pole may be comprised of a laminated structure having a plurality of “n” ferromagnetic layers and “n−1” AFM-FM phase change material layers arranged in an alternating manner. The AFM-FM phase change material is preferably a FeRh, FeRhPt, FeRhPd, or FeRhIr and may also be used as a flux gate to prevent yoke flux from leaking into the write pole tip. Heating for the AFM to FM transition is provided by write coils and/or a coil located near the AFM-FM phase change material to enable faster transition times.
摘要翻译：公开了一种PMR写入器，其在非写入期间最小化磁极擦除并且在写入期间通过在非写入期间处于反铁磁（AFM）状态的AFM-FM相变材料中的写入磁场最大化并切换到铁磁（FM）在写作期间加热状态。包括写极的主极层可以由具有多个“n”个铁磁层和“n-1”个AFM-FM相变材料层的交替排列的层压结构构成。 AFM-FM相变材料优选为FeRh，FeRhPt，FeRhPd或FeRhIr，并且还可以用作磁通门以防止磁轭焊剂泄漏到写极尖端。 AFM到FM转换的加热由位于AFM-FM相变材料附近的写入线圈和/或线圈提供，以实现更快的转换时间。

8. 发明申请

US20120279051A1 Method of Forming a Plasmon Antenna with Magnetic Core for Thermally Assisted Magnetic Recording 有权
标题翻译：用于磁辅助磁记录的磁芯形成等离子体天线的方法
公开(公告)号：US20120279051A1
公开(公告)日：2012-11-08
申请号：US13551670
申请日：2012-07-18
申请人： Yuchen Zhou , Kenichi Takano , Xuhui Jin , Erhard Schreck , Moris Dovek , Joe Smyth
发明人： Yuchen Zhou , Kenichi Takano , Xuhui Jin , Erhard Schreck , Moris Dovek , Joe Smyth
IPC分类号： G11B5/127
CPC分类号： G11B5/314 , G11B5/02 , G11B5/3116 , G11B5/3146 , G11B5/6088 , G11B2005/0005 , G11B2005/0021 , Y10T29/49032
摘要： A method of forming a TAMR (Thermal Assisted Magnetic Recording) write head that uses the energy of optical-laser generated edge plasmons in a plasmon antenna to locally heat a magnetic recording medium and reduce its coercivity and magnetic anisotropy. The method incorporates forming a magnetic core within the plasmon antenna, so the antenna effectively becomes an extension of the magnetic pole and produces a magnetic field whose maximum gradient overlaps the region being heated by the edge plasmons generated in the conducting layer of the antenna surrounding the antenna's magnetic core.
摘要翻译：一种形成TAMR（热辅助磁记录）写头的方法，其使用等离子体激元中的激光产生的边缘等离子体激元的能量来局部加热磁记录介质并降低其矫顽力和磁各向异性。该方法包括在等离子体激元天线内形成磁芯，因此天线有效地成为磁极的延伸，并产生磁场，其最大梯度与被天线周围的天线导电层中产生的边缘等离子体激发加热的区域重叠天线的磁芯。

9. 发明申请

US20120263024A1 Heat assisted narrow pole design with trailing shield 有权
标题翻译：热辅助窄杆设计与后盾
公开(公告)号：US20120263024A1
公开(公告)日：2012-10-18
申请号：US13066420
申请日：2011-04-14
申请人： Xuhui Jin , Yuchen Zhou , Kenichi Takano , Joe Smyth
发明人： Xuhui Jin , Yuchen Zhou , Kenichi Takano , Joe Smyth
IPC分类号： G11B13/04 , G11B5/127 , G11B7/22 , B82Y40/00 , B82Y10/00
CPC分类号： G11B5/84 , B82Y10/00 , G11B5/3116 , G11B5/314 , G11B2005/0021
摘要： A TAMR (Thermal Assisted Magnetic Recording) writer has a narrow pole tip with a trailing edge magnetic shield. The narrow pole tipped write head uses the energy of laser generated edge plasmons, formed in a plasmon generating layer, to locally heat a PMR magnetic recording medium below its Curie temperature, Tc. When combined with the effects of the narrow tip, this local heating to a temperature below Tc is sufficient to create good transitions and narrow track widths in the magnetic medium. The write head is capable of writing effectively on state-of-the-art PMR recording media having Hk of 20 kOe or more.
摘要翻译： TAMR（热辅助磁记录）写入器具有带有后缘磁屏蔽的窄极端。窄极尖写头使用在等离子体发生层中形成的激光产生的边缘等离子体激元的能量来局部加热低于其居里温度Tc的PMR磁记录介质。当与窄尖端的作用相结合时，这种局部加热到低于Tc的温度足以在磁性介质中产生良好的转变和窄的轨道宽度。写头能够有效地写入具有20kOe以上Hk的最先进的PMR记录介质。

10. 发明申请

US20120057257A1 Perpendicular magnetic recoding head with a laminated pole 有权
标题翻译：垂直磁记录头与层叠极
公开(公告)号：US20120057257A1
公开(公告)日：2012-03-08
申请号：US13373251
申请日：2011-11-09
申请人： Kenichi Takano , Lijie Guan , Yuchen Zhou , Joe Smyth , Moris Dovek
发明人： Kenichi Takano , Lijie Guan , Yuchen Zhou , Joe Smyth , Moris Dovek
IPC分类号： G11B5/147 , B05D1/36 , B05D5/00
CPC分类号： G11B5/3116 , G11B5/1278 , G11B5/147 , G11B5/3143
摘要： A laminated write pole layer for a PMR write head is disclosed in which a plurality of “n” magnetic layers and “n−1” non-magnetic spacers are formed in an alternating fashion on a substrate. The non-magnetic spacers promote exchange decoupling or antiferromagnetic coupling between adjacent magnetic layers. Writability is improved when the trailing magnetic layer has a thickness greater than the thickness of other magnetic layers and preferably >25% of the total thickness of the magnetic layers. The thicknesses of the other magnetic layers may be equal or may become progressively smaller with increasing distance from the trailing magnetic layer. In another embodiment, the non-magnetic spacer between the trailing magnetic layer and the nearest magnetic layer is replaced by a magnetic spacer made of a soft magnetic material to promote magnetic coupling and effectively increase the thickness of the trailing magnetic layer.
摘要翻译：公开了一种用于PMR写入头的层叠写入极层，其中在衬底上以交替的方式形成多个“n”个磁性层和“n-1”个非磁性间隔物。非磁性间隔物促进相邻磁性层之间的交换去耦或反铁磁耦合。当后磁性层的厚度大于其它磁性层的厚度，优选磁性层的总厚度的25％时，写入性能得到改善。其他磁性层的厚度可以相等或随着与后磁性层的距离的增加而逐渐变小。在另一个实施例中，后磁性层和最近的磁性层之间的非磁性间隔物被由软磁材料制成的磁性隔离层代替，以促进磁耦合并有效地增加后磁层的厚度。

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