公开(公告)号：US09355668B2

公开(公告)日：2016-05-31

申请号：US13899334

申请日：2013-05-21

申请人： HGST Netherlands B.V.

发明人： Yasutaka Nishida ,  Masato Shiimoto ,  Hiroyuki Katada ,  Ikuya Tagawa ,  Junguo Xu

IPC分类号： G11B5/00 ,  G11B5/60

CPC分类号： G11B5/6076 ,  G11B2005/0024

摘要： A hard-disk drive having a structurally efficient magnetic head slider utilizes a MAMR-based spin torque oscillator (STO) for head-disk contact detection and for flying height sensing. Contact detection and spacing estimation techniques consider the nominal temperature difference, and thus different criteria, between read and write operations.

摘要翻译： 具有结构有效的磁头滑块的硬盘驱动器利用基于MAMR的旋转扭矩振荡器（STO）来进行头盘接触检测和飞行高度感测。 接触检测和间隔估计技术考虑了读写操作之间的标称温差，因此考虑了不同的标准。

公开(公告)号：US09159348B2

公开(公告)日：2015-10-13

申请号：US14109603

申请日：2013-12-17

申请人： HGST Netherlands B.V.

发明人： Jianhua Li ,  Junguo Xu ,  Toshiya Shiramatsu ,  Takehiro Sato

IPC分类号： G11B21/02 ,  G11B5/60

CPC分类号： G11B5/6017 ,  G11B5/6011

摘要： A method for measuring the head-disk clearance between a slider and a disk includes measuring a first resistance with a first bias applied to an embedded contact sensor of the slider, measuring a second resistance with a second bias applied to the embedded contact sensor of the slider, and determining the head-disk clearance based at least in part on a difference between the first resistance and the second resistance. A system includes a disk drive, a slider comprising an embedded contact sensor, and circuitry to apply at least two bias voltages to the embedded contact sensor, measure at least two resistances of the embedded contact sensor based on the application of the at least two bias voltages, and to determine the head-disk clearance based at least in part on a difference between the at least two resistances.

摘要翻译： 用于测量滑块和盘之间的头盘间隙的方法包括：利用施加到滑块的嵌入式接触传感器的第一偏压来测量第一电阻，以施加到嵌入式接触传感器的第二偏压来测量第二电阻 滑块，并且至少部分地基于第一阻力和第二阻力之间的差异来确定头盘间隙。 一种系统包括盘驱动器，包括嵌入式触点传感器的滑块以及向嵌入式触点传感器施加至少两个偏置电压的电路，基于至少两个偏压的应用来测量嵌入式触点传感器的至少两个电阻 电压，并且至少部分地基于所述至少两个电阻之间的差异来确定磁头盘间隙。

公开(公告)号：US08797693B1

公开(公告)日：2014-08-05

申请号：US13975660

申请日：2013-08-26

申请人： HGST Netherlands B.V.

发明人： Masaru Furukawa ,  Junguo Xu ,  Makoto Satou ,  Kenji Suzuki

IPC分类号： G11B5/33

CPC分类号： G11B5/6094 ,  G11B5/3106 ,  G11B2005/0024

摘要： A method, apparatus, and system are provided for preventing electrostatic discharge (ESD) in hard disk drives using spin-torque oscillator (STO) for microwave assisted magnetic recording (MAMR). A control circuit adjusts a disk electrical potential with an electrical potential of a spin-torque oscillator (STO) element. The control circuit maintains a potential difference of less than about 115 millivolts (mV) between the disk and the STO element.

摘要翻译： 提供了一种使用微波辅助磁记录（MAMR）的自旋扭矩振荡器（STO）来防止硬盘驱动器中的静电放电（ESD）的方法，装置和系统。 控制电路利用自旋转矩振荡器（STO）元件的电位来调整盘电位。 控制电路在盘和STO元件之间维持小于约115毫伏（mV）的电位差。

公开(公告)号：US20140347969A1

公开(公告)日：2014-11-27

申请号：US13899334

申请日：2013-05-21

申请人： HGST Netherlands B.V.

发明人： Yasutaka Nishida ,  Masato Shiimoto ,  Hiroyuki Katada ,  Ikuya Tagawa ,  Junguo Xu

IPC分类号： G11B5/60

CPC分类号： G11B5/6076 ,  G11B2005/0024

摘要： A hard-disk drive having a structurally efficient magnetic head slider utilizes a MAMR-based spin torque oscillator (STO) for head-disk contact detection and for flying height sensing. Contact detection and spacing estimation techniques consider the nominal temperature difference, and thus different criteria, between read and write operations.

摘要翻译： 具有结构有效的磁头滑块的硬盘驱动器利用基于MAMR的旋转扭矩振荡器（STO）来进行头盘接触检测和飞行高度感测。 接触检测和间隔估计技术考虑了读写操作之间的标称温差，因此考虑了不同的标准。

公开(公告)号：US09053725B1

公开(公告)日：2015-06-09

申请号：US14468164

申请日：2014-08-25

申请人： HGST Netherlands B.V.

发明人： Yuichiro Sano ,  Junguo Xu ,  Yuka Morimoto

IPC分类号： G11B5/55 ,  G11B5/60

CPC分类号： G11B5/5552 ,  G11B5/5547 ,  G11B5/6076 ,  G11B19/041 ,  G11B19/048 ,  G11B20/1883 ,  G11B20/1889

摘要： A hard disk drive electronic component processes a signal from a piezoelectric actuator to identify where on a disk the slider encounters a disk defect. The signal received from the piezoelectric actuator may be based on the mechanical propagation, through the suspension to the piezoelectric actuator, of an effect of slider contact with the protrusion. Further, an actuator may be commanded to systematically move the head slider across the writeable portion of the disk to map all the protrusions on the writeable portion of the disk.

摘要翻译： 硬盘驱动器电子部件处理来自压电致动器的信号以识别滑块遇到磁盘缺陷的磁盘。 从压电致动器接收的信号可以基于通过悬架到压电致动器的机械传播，其具有与突起的滑动接触的效果。 此外，可以命令致动器系统地将磁头滑动器跨过磁盘的可写入部分来映射磁盘的可写入部分上的所有突起。

公开(公告)号：US09007724B1

公开(公告)日：2015-04-14

申请号：US14302549

申请日：2014-06-12

申请人： HGST Netherlands B.V.

发明人： Masaru Furukawa ,  Junguo Xu ,  Masato Shiimoto ,  Jianhua Li

IPC分类号： G11B5/33 ,  G11B5/48 ,  G11B21/02

CPC分类号： G11B5/48 ,  G11B5/314 ,  G11B5/40 ,  G11B2005/0024

摘要： Embodiments disclosed herein generally relate to the data storage field and hard disk drives (HDD) using microwave assisted magnetic recording (MAMR) technology. Aspects of the preferred embodiments are to prevent the breakdown of spin torque oscillators (STO) due to large amounts of current flowing through the STO during head/disk contact. A magnetic head slider is disposed above and spaced apart from a disk. A STO is formed on a section of the magnetic head slider. Two electrodes are coupled to the STO, and one electrode has a higher potential than the other electrode. A preamplifier is adapted to send a current through the two electrodes, resulting in the higher potential electrode protruding closer to the disk than the lower potential electrode. Current then flows from one electrode to the disk without flowing through the STO, and breakdown of the STO is prevented.

摘要翻译： 本文公开的实施例通常涉及使用微波辅助磁记录（MAMR）技术的数据存储区域和硬盘驱动器（HDD）。 优选实施例的方面是防止由于在头/盘接触期间流过STO的大量电流而导致的自旋转矩振荡器（STO）的故障。 磁头滑块设置在盘的上方并与盘间隔开。 在磁头滑块的一部分上形成STO。 两个电极耦合到STO，一个电极具有比另一个电极更高的电位。 前置放大器适合于通过两个电极发送电流，导致较低电位电极比较靠近磁盘的电位较高的电极。 电流然后从一个电极流到盘而不流过STO，并且防止了STO的击穿。

公开(公告)号：US09311945B2

公开(公告)日：2016-04-12

申请号：US14073751

申请日：2013-11-06

申请人： HGST Netherlands B.V.

发明人： Kenichiro Takahashi ,  Junguo Xu ,  Jianhua Li ,  Masaru Furukawa

IPC分类号： G11B5/00 ,  G11B5/60

CPC分类号： G11B5/6076 ,  G11B2005/0024

摘要： Embodiments of the present invention generally relate to a MAMR head. The MAMR head includes an STO and an embedded contact sensor (ECS). The STO and the ECS are electrically connected in series and are connected to the same terminals. During operation, the current applied to the STO is controlled with respect to a change in resistance of the ECS.

摘要翻译： 本发明的实施例一般涉及一种MAMR头。 MAMR头包括STO和嵌入式触点传感器（ECS）。 STO和ECS串联电连接并连接到相同的端子。 在运行期间，施加到STO的电流相对于ECS的电阻变化而被控制。

公开(公告)号：US20150170695A1

公开(公告)日：2015-06-18

申请号：US14109603

申请日：2013-12-17

申请人： HGST NETHERLANDS B.V.

发明人： Jianhua Li ,  Junguo Xu ,  Toshiya Shiramatsu ,  Takehiro Sato

IPC分类号： G11B5/60

CPC分类号： G11B5/6017 ,  G11B5/6011

摘要： A method for measuring the head-disk clearance between a slider and a disk includes measuring a first resistance with a first bias applied to an embedded contact sensor of the slider, measuring a second resistance with a second bias applied to the embedded contact sensor of the slider, and determining the head-disk clearance based at least in part on a difference between the first resistance and the second resistance. A system includes a disk drive, a slider comprising an embedded contact sensor, and circuitry to apply at least two bias voltages to the embedded contact sensor, measure at least two resistances of the embedded contact sensor based on the application of the at least two bias voltages, and to determine the head-disk clearance based at least in part on a difference between the at least two resistances.

摘要翻译： 用于测量滑块和盘之间的头盘间隙的方法包括：利用施加到滑块的嵌入式接触传感器的第一偏压来测量第一电阻，以施加到嵌入式接触传感器的第二偏压来测量第二电阻 滑块，并且至少部分地基于第一阻力和第二阻力之间的差异来确定头盘间隙。 一种系统包括盘驱动器，包括嵌入式触点传感器的滑块以及向嵌入式触点传感器施加至少两个偏置电压的电路，基于至少两个偏压的应用来测量嵌入式触点传感器的至少两个电阻 电压，并且至少部分地基于所述至少两个电阻之间的差异来确定磁头盘间隙。

公开(公告)号：US08885274B1

公开(公告)日：2014-11-11

申请号：US14057257

申请日：2013-10-18

申请人： HGST Netherlands B.V.

发明人： Masaru Furukawa ,  Junguo Xu ,  Jianhua Li ,  Makoto Satou ,  Kenichiro Takahashi

IPC分类号： G11B27/36

CPC分类号： G11B5/455 ,  G11B5/012 ,  G11B5/6076 ,  G11B20/10305 ,  G11B20/1816 ,  G11B2005/0024

摘要： A method, apparatus, and system are provided for implementing enhanced surface analysis test (SAT) function for microwave assisted magnetic recording (MAMR) hard disk drives (HDDs) using embedded contact sensor (ECS) and spin-torque oscillator (STO) signals. A preamplifier circuit receives the embedded contact sensor (ECS) and spin-torque oscillator (STO) signals and compares the received ECS and STO signals to identify magnetic disk media defects including bumps or thermal-asperity (TA) defects and pits or hole defects.

摘要翻译： 提供了一种使用嵌入式接触传感器（ECS）和自旋扭矩振荡器（STO）信号来实现用于微波辅助磁记录（MAMR）硬盘驱动器（HDD）的增强表面分析测试（SAT）功能的方法，装置和系统。 前置放大器电路接收嵌入式接触传感器（ECS）和自旋扭矩振荡器（STO）信号，并将接收的ECS和STO信号进行比较，以识别包括凸起或热凹凸（TA）缺陷和凹坑或孔缺陷的磁盘介质缺陷。