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Magnetoresistive sensor with decoupled hard bias multilayers

A magnetoresistive sensor and bias layer technology, applied in the field of magnetic bias, can solve problems such as reducing sensitivity

Inactive Publication Date: 2008-02-27
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If M is chosen such that the number of failures due to insufficient magnetization 16 is small, then the majority of all devices will be unnecessarily desensitized by having a magnetization 16 much higher than required

Method used

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  • Magnetoresistive sensor with decoupled hard bias multilayers
  • Magnetoresistive sensor with decoupled hard bias multilayers
  • Magnetoresistive sensor with decoupled hard bias multilayers

Examples

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Embodiment Construction

[0025] FIG. 4 shows a portion of a magnetic sensor according to an embodiment of the invention having a multilayer magnetic bias assembly that independently provides multiple magnetic biases to the free layer 10 . Bias layers 12a and 12b are separated by decoupling layer 26 . Likewise, bias layers 14a and 14b are separated by decoupling layer 26 . Decoupling layer 26 serves to substantially eliminate exchange coupling between layers 12a and 12b (and between layers 14a and 14b). In addition, layers 12a and 12b have different coercive forces, and layers 14a and 14b have different coercive forces. Bias layers 12a and 12b are combined with decoupling layer 26 as a magnetic bias component, and layers 14a and 14b are also combined with decoupling layer 26 as a magnetic bias component. Magnetizations 18 a and 20 a provide magnetic bias 16 a to free layer 10 , and magnetizations 18 b and 20 b provide magnetic bias 16 b to free layer 10 . Magnetization 16 is determined by the combin...

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Abstract

A magnetic sensor is provided, having two bias layers separated by a decoupling layer to eliminate exchange coupling between the bias layers. The two bias layers may have differing coercivities, such that the biases provided by the bias layers to the free layer are independently adjustable. The grain structures of the two bias layers may be substantially decorrelated by the decoupling layer.

Description

technical field [0001] The present invention relates to a magnetic sensor for a disk drive, and more particularly, to magnetic biasing of a free layer of the magnetic sensor. Background technique [0002] Thin film magnetoresistive sensors or heads have been used in magnetic storage devices (ie, disk drives) for several years. Such sensors include a layer of magnetoresistive material commonly referred to as a free layer. The resistivity of the free layer changes in response to an external magnetic field. Thus, magnetically recorded information is detected by sensing changes in electrical resistance within the free layer. [0003] The free layer is usually a ferromagnetic material with low coercivity, such as NiFe, CoFe, NiCoFe alloys, so that its magnetization (also called magnetic moment) can easily respond to the sensed external changes with changes in the magnetic field. In addition, it is highly desirable that the free layer is in a single magnetic domain state. If ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/39H01L43/00G11B5/127G11B5/33
CPCG11B5/3932
Inventor 玛丽-克莱尔·西里尔丁萌库奥克·S·霍普拉卡什·卡西拉杰欧内斯托·马里尼罗詹姆斯·L·尼克斯布赖恩·约克
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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