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    • 5. 发明授权
    • Deactivatable fequency-dividing-transponder tag
    • 不可激活的分类 - 应答器标签
    • US4882569A
    • 1989-11-21
    • US224326
    • 1988-07-26
    • Subrata Dey
    • Subrata Dey
    • G01S13/74G08B13/24H01F21/08
    • G08B13/2411G08B13/2437G08B13/2442G08B13/2448
    • A presence-detection-system tag in which a frequency-dividing transponder may be decisively deactivated notwithstanding the intensity of the ambient magnetic field. The tag includes a frequency-dividing transponder including an active strip of magnetic material that, when magnetically biased to be within a predetermined magnetic field intensity range, responds to excitation by electromagnetic radiation of a first predetermined frequency by radiating electromagnetic radiation of a second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency; a first bias strip of magnetic material disposed in relation to the active strip of magnetic material for biasing the active strip of magnetic material to be within the predetermined magnetic field intensity range only when the first bias strip of magnetic material is magnetized; and a second bias strip of magnetic material disposed in relation to the active strip of magnetic material for further biasing the active strip to be outside of the predetermined magnetic field intensity range to thereby prevent the active strip of magnetic material from radiating electromagnetic radiation of the second predetermined frequency in response to excitation by electromagnetic radiation of the first predetermined frequency when the first and second bias strips of magnetic material are both magnetized. A coded tag includes two such active strips having different magnetomechanical resonant frequencies. Either tag may be detected in a presence detection system that includes means for transmitting an electromagnetic radiation signal of a first predetermined frequency into a surveillance zone; and means for detecting electromagnetic radiation of the second predetermined frequency within the surveillance zone. The system further includes a magnetizer for magnetizing the second bias strip to thereby deactivate the frequency-dividing transponder of the tag.
    • 7. 发明授权
    • Current pinned dual spin valve with synthetic pinned layers
    • 当前固定式双自旋阀,具有合成钉扎层
    • US06317297B1
    • 2001-11-13
    • US09413287
    • 1999-10-06
    • Hua-Ching TongXizeng ShiSubrata DeyMatthew Richard Gibbons
    • Hua-Ching TongXizeng ShiSubrata DeyMatthew Richard Gibbons
    • G11B539
    • B82Y25/00B82Y10/00G01R33/093G11B5/3903G11B5/3954G11B2005/3996H01F10/3263
    • A method and system for providing a magnetoresistive sensor is disclosed. The method and system include providing a first pinned layer, providing a first spacer layer above the first pinned layer, and providing a free layer above the first spacer layer. The method and system further include providing a second spacer layer above the free layer and providing a second pinned layer above the second spacer layer. The first pinned layer includes a first magnetic layer and a second magnetic layer separated by a first nonmagnetic layer. The first magnetic layer is antiferromagnetically coupled with the second magnetic layer. The second pinned layer includes a third magnetic layer and a fourth magnetic layer separated by a second nonmagnetic layer. The third magnetic layer is antiferromagnetically coupled with the fourth magnetic layer. The first pinned layer and the second pinned layer are pinned by a current carried by the magnetoresistive head during use.
    • 公开了一种用于提供磁阻传感器的方法和系统。 该方法和系统包括提供第一被钉扎层,在第一被钉扎层上方提供第一间隔层,以及在第一间隔层上方提供自由层。 该方法和系统还包括在自由层上方提供第二间隔层,并在第二间隔层上方提供第二钉扎层。 第一被钉扎层包括由第一非磁性层分离的第一磁性层和第二磁性层。 第一磁性层与第二磁性层反铁磁耦合。 第二被钉扎层包括由第二非磁性层分离的第三磁性层和第四磁性层。 第三磁性层与第四磁性层反铁磁耦合。 第一被钉扎层和第二钉扎层在使用期间由磁阻头承载的电流固定。
    • 8. 发明授权
    • Heat exchangeable thin-film recording head element and method for
manufacturing same
    • 可热交换薄膜记录头元件及其制造方法
    • US5930086A
    • 1999-07-27
    • US850039
    • 1997-05-02
    • Yi-Shung ChaugSubrata Dey
    • Yi-Shung ChaugSubrata Dey
    • G11B5/31G11B5/39G11B5/40G11B5/127
    • B82Y25/00B82Y10/00G11B5/3136G11B5/3903G11B5/40G11B2005/3996G11B5/3103G11B5/3133
    • A recording element is provided for use in a high density thin film recording head. The recording element includes a substrate, a thermally conductive material in contact with the substrate, and an insulative layer in contact with the thermally conductive material. The recording element further includes a magneto-resistive element in contact with the insulative layer such that the magneto-resistive element fails to overlay the thermally conductive material. The thermally conductive material and the insulative layer have thermal conductivities sufficient to dissipate heat from the magneto-resistive element so that heat induced malfunctions of the recording element are minimized. The method for manufacturing the recording element is also provided. The method includes depositing a thermally conductive material in contact with a substrate, depositing an insulative layer in contact with the thermally conductive material, and depositing a magneto-resistive element in contact with the insulative layer such that the magneto-resistive element fails to overlay the thermally conductive material.
    • 提供用于高密度薄膜记录头的记录元件。 记录元件包括基板,与基板接触的导热材料以及与导热材料接触的绝缘层。 记录元件还包括与绝缘层接触的磁阻元件,使得磁阻元件不能覆盖导热材料。 导热材料和绝缘层具有足以散发来自磁阻元件的热的热导率,使得记录元件的热引起的故障最小化。 还提供了用于制造记录元件的方法。 该方法包括沉积与衬底接触的导热材料,沉积与导热材料接触的绝缘层,以及沉积与绝缘层接触的磁阻元件,使得磁阻元件不能覆盖 导热材料。