Seagate Technology Incorporated

Scott Wilson Stokes

Victor Sapozhnikov

Mohammed Shariat Ullah Patwari

Dimitar Velikov Dimitrov

Declan Macken

Mark William Covington

Krishnan Subramanian

Jason Bryce Gadbois

Dian Song

Andrzej Adam Stankiewicz

Jiexuan He

Jenny J Wang

Pavol Krivosik

An apparatus and method for mitigating noise in a waveform from a signal-producing device. The method includes receiving the waveform from the signal-producing device, and decomposing the waveform into low frequency (LF) and high frequency (HF) components. The method also includes determining an instant amplitude of the HF component, and employing the instant amplitude of the HF component and possibly the LF component to obtain a noise correction value for the LF component. The method further includes adding the obtained noise correction value to the LF component to obtain an output signal.

Mitigation of noise generated by random excitation of asymmetric oscillation modes

A hybrid dual reader. The hybrid dual reader includes first and second read sensors with conflicting design characteristics. The first read sensor includes at least one signal-to-noise ratio favoring design characteristic. The second read sensor includes at least one pulse width favoring design characteristic. The at least one signal-to-noise ratio favoring design characteristic is in conflict with the at least one pulse width favoring design characteristic.

Read head having sensors with conflicting design characteristics

A multi-sensor reader includes first and second read sensors. The first read sensor includes a first sensor stack including a sensing layer having a magnetization that changes according to an external magnetic field, and a first biasing component configured to magnetically bias the sensing layer of the first sensor stack in a first direction. The second read sensor includes a second sensor stack including a sensing layer having a magnetization that changes according to an external magnetic field, and a second biasing component configured to magnetically bias the sensing layer of the second sensor stack in a second direction that is substantially opposite the first direction.

Multi-sensor reader having oppositely biased sensing layers

A reader having a bearing surface, a free layer, and a free layer biasing structure. The free layer biasing structure includes at least one side shield that applies a first bias field level to a front portion of the free layer that is nearest to the bearing surface and applies a second bias field level to a rear portion of the free layer that is farthest from the bearing surface. The second bias field level is greater than the first bias field level.

Read head free layer having front and rear portions biased at different levels

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.

Reader with free layer experiencing opposite phase-shifted media torques

In certain embodiments, an apparatus includes a top shield, bottom shield, polarizer, nonmagnetic conductor layer, and a sensor stack having a first sensor layer. The sensor stack is positioned at a distance recessed from a first plane. The nonmagnetic conductor layer is positioned between the polarizer and the first sensor layer. A magnetization of the first sensor layer is arranged and configured to move in the same direction as a magnetization of the polarizer.

Devices and methods using recessed electron spin analyzers

An asymmetry is determined of a signal generated by a read transducer in proximity to a changing magnetic field of a magnetic media. In response to determining the asymmetry of the signal, a current flowing through a heater of the read transducer is adjusted to cause a change to a magnetic field generated by the current. The change to the magnetic field generated by the current reduces the asymmetry of the signal.

Adjusting heater current to reduce read transducer asymmetry

In certain embodiments, a magnetic had includes a top shield and a bottom shield positioned at an air bearing surface. A polarizer and a nonmagnetic layer are positioned between the top and bottom shields. An analyzer is positioned adjacent the nonmagnetic layer at a distance recessed from the air bearing surface. Current travels through the top shield, polarizer, nonmagnetic layer, and first analyzer.

An apparatus and associated method is presently disclosed for a data sensing element capable of detecting changes in magnetic states. Various embodiments of the present invention are generally directed to a magnetically responsive lamination that has a spacer layer disposed between a first and second ferromagnetic free layer. The lamination having at least one free layer with a shape feature that increases a scissoring angle between the free layers.

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Brooklyn Park, MN, United States of America

Scott Wilson Stokes