Seagate Technology Incorporated

Andrzej Adam Stankiewicz

Taras Grigorievich Pokhil

Eric Walter Singleton

Konstantin Nikolaev

Mohammed Patwari

Victor Sapozhnikov

Janusz Jozef Nowak

Nurul Amin

Patrick Joseph Ryan

Krishnan Subramanian

Mohammed Shariat Ullah Patwari

Ned Tabat

Johannes Van Ek

Scott Wilson Stokes

Janusz Josef Nowak

Pu-Ling Lu

Taras Grigoryevich Pokhil

Steven Paul Bozeman

Steven Kalderon

A reader includes a bearing surface and a free layer having a front surface that forms a portion of the bearing surface. The reader also includes a synthetic antiferromagnetic (SAF) structure below the free layer, the SAF structure has a narrow portion with a front surface that forms a portion of the bearing surface and a wide portion behind the narrow portion. The reader further includes an antiferromagnetic (AFM) layer in contact with the wide portion of the SAF structure. The SAF structure is configured to prevent switching from one magnetic state to another magnetic state in the wide portion under thermal fluctuations.

Reader with wide synthetic antiferromagnetic structure optimized for high stability and low noise

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 reader sensor having a dusting layer having a thickness less than 5 Angstroms between and in contact with the AFM layer and with the pinned layer. The dusting layer comprises a non-magnetic, electrically conducting material, such as ruthenium or iridium. The reader sensor has a free layer composed of a material free of nickel (Ni).

Sensor structure having increased thermal stability

A reader sensor that has a sensor stack with an AFM layer, a pinned stabilization layer, and a pinned layer, with the pinned stabilization layer closer to the AFM layer than to the pinned layer. The stack also includes a non-magnetic spacer layer between and in contact with the pinned stabilization layer and with the pinned layer. A magnetic coupling between the pinned stabilization layer and the pinned layer is no more than 50% of a magnetic coupling between the pinned stabilization layer and the AFM layer.

Sensor structure with pinned stabilization layer

The present invention relates to a head having an air bearing surface for confronting the surface of a storage medium. The head includes a first pole that is spaced apart from a second pole. At least one non-magnetic spacer is positioned between the first pole and the second pole such that the first pole is magnetically decoupled from the second pole. In a further aspect, one or both of the first pole and the second pole can be elliptical in shape.

Recording head for reducing side track erasure

Data is written to a magnetic media, by applying a magnetic write field to the magnetic media with a write pole, in conjunction with a high frequency magnetic field, to the magnetic media to assist writing to the magnetic media. The high frequency magnetic field is generated by applying a specific write current waveform to the magnetic writer, resulting in the generation of a high frequency magnetic write field.

High frequency assisted writing

A magnetoresistive sensor for sensing a magnetic storage medium includes a free layer that has a magnetic anisotropy that supports stable magnetic states. A magnetic field generator biases the stable states of the free layer. The magnetic field generator may permanently bias the free layer through the use of permanent magnets or may intermittently bias the free layer with a magnetic field generated by an alternating current. A magnetic storage medium is located proximate to the magnetoresistive sensor. The magnetoresistive sensor switches between stable magnetic states in response to the data on the magnetic storage medium. The magnetoresistive sensor senses the data stored in sectors on a magnetic medium by magnetically biasing the free layer, positioning the sensor proximate to a sector of the magnetic medium to be sensed, removing the magnetic bias and then sensing the magnetic state of the free layer while the magnetic bias is removed.

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Edina, MN, United States of America

Andrzej Adam Stankiewicz