Reader with free layer experiencing opposite phase-shifted media torques
a free layer and reader technology, applied in the field of readers, can solve the problems of unbalanced saf free layer design, unable to achieve further sss reduction,
Active Publication Date: 2017-05-18
SEAGATE TECH LLC
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AI Technical Summary
Benefits of technology
The patent is about a reader that can handle larger amounts of data and transfer them faster. The reader has a special structure called an unbalanced synthetic antiferromagnetic (SAF) free layer. This layer has two magnetic layers that have different magnetic moments. A separation layer is between the two layers. These two layers are connected in a way that causes them to cancel each other out. This design helps to reduce interference and improve the performance of the reader.
Problems solved by technology
A large body of work has already been carried out to push SSS as low as possible and therefore further SSS reduction is getting progressively harder to achieve.
Thus, the unbalanced SAF free layer designs significantly improve PW50 while preserving the readback signal amplitude.
Additionally, the illustrations are merely representational and may not be drawn to scale.
Method used
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Embodiment Construction
[0015]Embodiments described below relate to free layer structures included in magnetoresistive (MR) sensors that are designed to addresses challenges posed by greater data density requirements. However, prior to providing details regarding the different embodiments, a description of an illustrative operating environment is provided below.
[0016]FIG. 1 shows an illustrative operating environment in which certain specific embodiments disclosed herein may be incorporated. The operating environment shown in FIG. 1 is for illustration purposes only. Embodiments of the present disclosure are not limited to any particular operating environment such as the operating environment shown in FIG. 1. Embodiments of the present disclosure are illustratively practiced within any number of different types of operating environments. It should be noted that the same reference numerals are used in different figures for same or similar elements.
[0017]FIG. 1 is a schematic illustration of a data storage d...
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Abstract
A read sensor that includes an unbalanced synthetic antiferromagnetic (SAF) free layer structure. The unbalanced SAF free layer structure includes a first magnetic layer having a first magnetic moment value and a second magnetic layer having a second magnetic moment value that is different from the first magnetic moment value. A separation layer is included between the first magnetic layer and the second magnetic layer. The first magnetic layer and the second magnetic layer are antiferromagnetically coupled.
Description
BACKGROUND[0001]Data storage devices commonly have a recording head that includes a read transducer that reads information from a data storage medium and a write transducer that writes information to a data storage medium.[0002]In magnetic data storage devices such as disc drives, a magnetoresistive (MR) sensor such as a Giant Magnetoresistive (GMR) sensor or a Tunnel Junction Magnetoresistive (TMR) sensor may be employed as the read transducer to read a magnetic signal from the magnetic media. The MR sensor has an electrical resistance that changes in response to an external magnetic field. This change in electrical resistance can be detected by processing circuitry in order to read magnetic data from the adjacent magnetic media.[0003]With ever-increasing levels of recording density in disc drives and a need for faster data transfer speeds, the read transducer needs to have correspondingly better data-reproducing capabilities.SUMMARY[0004]The present disclosure relates to a reader ...
Claims
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IPC IPC(8): G11B5/39
CPCG11B5/3912G11B5/3932G11B5/3906G11B5/398H01F10/3254H01F10/3272H10N50/01H10N50/10H10N50/20H01F10/32
Inventor SAPOZHNIKOV, VICTOR B.PATWARI, MOHAMMED SHARIAT ULLAHSTOKES, SCOTT WILSON
Owner SEAGATE TECH LLC