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    • 44. 发明授权
    • Method for measurement of magnetic field gradient of recording magnetic field generated by magnetic head
    • 测量由磁头产生的记录磁场的磁场梯度的方法
    • US08619510B1
    • 2013-12-31
    • US13600326
    • 2012-08-31
    • Ken-ichi TakanoSatoshi TomikawaTomohito MizunoHiroshi Kiyono
    • Ken-ichi TakanoSatoshi TomikawaTomohito MizunoHiroshi Kiyono
    • G11B11/00
    • G11B5/455G11B5/02G11B2005/0021
    • A measurement method of a magnetic field gradient of a recording magnetic field generated by a magnetic head in a recording medium includes a step of locally heating the recording medium in a nonmagnetic field state where a magnetic field is not applied to the recording medium at all and measuring a temperature gradient of the recording medium in the nonmagnetic field state, a step of locally heating the recording medium in a recording magnetic field application state where the recording magnetic field is applied to the recording medium and measuring a temperature gradient of the recording medium in the recording magnetic field application state, and a step of calculating a magnetic field gradient of the recording magnetic field based on the temperature gradient of the recording medium in the nonmagnetic field state and the temperature gradient of the recording medium in the recording magnetic field application state.
    • 在记录介质中由磁头产生的记录磁场的磁场梯度的测量方法包括:在完全没有向记录介质施加磁场的非磁场状态下局部地加热记录介质的步骤,以及 测量记录介质在非磁场状态下的温度梯度;在记录磁场施加状态下对记录介质进行局部加热的步骤,其中记录磁场被施加到记录介质上并测量记录介质的温度梯度 记录磁场施加状态,以及基于非磁场状态下的记录介质的温度梯度和记录磁场施加状态下记录介质的温度梯度来计算记录磁场的磁场梯度的步骤 。
    • 45. 发明授权
    • Method for detecting protrusion height of magnetic head slider having thermally assisted head
    • 用于检测具有热辅助头的磁头滑块的突出高度的方法
    • US08416650B2
    • 2013-04-09
    • US13212604
    • 2011-08-18
    • Takahiro MoriSatoshi TomikawaHiroshi Kiyono
    • Takahiro MoriSatoshi TomikawaHiroshi Kiyono
    • G11B11/00G11B27/36
    • G11B5/3133G11B5/314G11B5/607G11B2005/0021
    • A magnetic head slider includes a near-field light generator, an incorporated heater is activated to thermally-expand the magnetic head slider so that a first protrusion is generated on the air bearing surface, and a second protrusion protruding from the first protrusion is generated by a thermal expansion of the near-field light generator. A standard signal is written to a recording medium with a predetermined magnetization. A relation between a residual magnetization of the standard signal and a power of the heater is obtained by lowering the magnetization of the standard signal by heating the recording medium with the near-field light while light output of laser light is maintained to be constant and the power of the heater is varied. Further, a relation between the first spacing and the residual magnetization is obtained. A value of the first spacing is obtained as a protrusion height of the second protrusion from the first protrusion when the second protrusion contacts the recording medium, the value of the first spacing being determined where an absolute value of a change rate of the residual magnetization is less than a predetermined standard value.
    • 磁头滑动器包括近场光发生器,启动加入的加热器以热膨胀磁头滑块,使得在空气轴承表面上产生第一突起,并且从第一突起突出的第二突起通过 近场光发生器的热膨胀。 将标准信号写入具有预定磁化强度的记录介质。 标准信号的剩余磁化强度与加热器的功率之间的关系是通过在将激光的光输出维持为恒定的同时通过加热具有近场光的记录介质来降低标准信号的磁化而获得的, 加热器的功率不同。 此外,获得第一间隔和剩余磁化之间的关系。 当第二突起与记录介质接触时,第一间隔的值作为第二突起从第一突起的突出高度获得,第一间隔的值确定为剩余磁化强度的变化率的绝对值为 小于预定的标准值。
    • 46. 发明申请
    • METHOD FOR DETECTING PROTRUSION HEIGHT OF MAGNETIC HEAD SLIDER HAVING THERMALLY ASSISTED HEAD
    • 用于检测具有热辅助头的磁头滑块的伸长高度的方法
    • US20130044575A1
    • 2013-02-21
    • US13212604
    • 2011-08-18
    • Takahiro MoriSatoshi TomikawaHiroshi Kiyono
    • Takahiro MoriSatoshi TomikawaHiroshi Kiyono
    • G11B7/1263
    • G11B5/3133G11B5/314G11B5/607G11B2005/0021
    • A magnetic head slider includes a near-field light generator, an incorporated heater is activated to thermally-expand the magnetic head slider so that a first protrusion is generated on the air bearing surface, and a second protrusion protruding from the first protrusion is generated by a thermal expansion of the near-field light generator. A standard signal is written to a recording medium with a predetermined magnetization. A relation between a residual magnetization of the standard signal and a power of the heater is obtained by lowering the magnetization of the standard signal by heating the recording medium with the near-field light while light output of laser light is maintained to be constant and the power of the heater is varied. Further, a relation between the first spacing and the residual magnetization is obtained. A value of the first spacing is obtained as a protrusion height of the second protrusion from the first protrusion when the second protrusion contacts the recording medium, the value of the first spacing being determined where an absolute value of a change rate of the residual magnetization is less than a predetermined standard value.
    • 磁头滑动器包括近场光发生器,启动加入的加热器以热膨胀磁头滑动器,使得在空气轴承表面上产生第一突起,并且从第一突起突出的第二突起通过 近场光发生器的热膨胀。 将标准信号写入具有预定磁化强度的记录介质。 标准信号的剩余磁化强度与加热器的功率之间的关系是通过在将激光的光输出维持为恒定的同时通过加热具有近场光的记录介质来降低标准信号的磁化而获得的, 加热器的功率不同。 此外,获得第一间隔和剩余磁化之间的关系。 当第二突起与记录介质接触时,第一间隔的值作为第二突起从第一突起的突出高度获得,第一间隔的值确定为剩余磁化强度的变化率的绝对值为 小于预定的标准值。
    • 47. 发明授权
    • Testing method of magnetic head by using inductance
    • 使用电感测试磁头的方法
    • US07960968B2
    • 2011-06-14
    • US12102569
    • 2008-04-14
    • Hiroshi KiyonoTakahiro Mori
    • Hiroshi KiyonoTakahiro Mori
    • G01R33/12G11B5/127
    • G01R33/093B82Y25/00G11B5/3166G11B5/3173G11B5/455Y10T29/49036
    • It is an object of the present invention to provide a method for investigating magnetic domains, the method capable of easily grasping behavior of the magnetic domains in a head manufacturing process, and further to provide a testing method of a magnetic head capable of evaluating whether the writing performance of the magnetic head is good or not. The method for investigating magnetic domains comprises supplying direct current (DC) to a coil of an electromagnetic transducer provided in a magnetic head for writing data onto a magnetic recording medium; measuring an inductance of the electromagnetic transducer at each current value while varying the current value of the direct current; and investigating behavior of magnetic domains in a magnetic core of the electromagnetic transducer based on a relationship between the current values and the inductances. The testing method of a magnetic head comprises evaluating whether writing performance of the magnetic head is good or not, based on a relationship between the current values and the inductances.
    • 本发明的目的是提供一种用于研究磁畴的方法,该方法能够容易地掌握磁头制造过程中的磁畴的行为,并且还提供一种能够评估磁头的磁头的测试方法 磁头的写入性能是否好。 用于研究磁畴的方法包括向设置在磁头中的电磁换能器的线圈提供直流电(DC)以将数据写入磁记录介质; 在改变所述直流电流的当前值的同时测量每个电流值下的所述电磁换能器的电感; 并根据电流值和电感之间的关系研究电磁换能器的磁芯中磁畴的行为。 磁头的测试方法包括基于电流值和电感之间的关系评估磁头的写入性能是否良好。