Seagate Technology Incorporated

Juan Jose Fernandez-de-Castro

Lujun Chen

James H Giusti

Kaizhong Gao

Song Sheng Xue

Shaoping Li

Sining Mao

Yuming Zhou

Feng Y Wang

Jian Chen

Erli Chen

Douglas A Saunders

Jim Giusti

Jian X Shen

An apparatus that includes a first read shield and a second read shield and a reader stack between the first and second read shields. The first and second read shields each include a tilted magnetization layer closest to the reader stack to control magnetic field flux lines in a free layer of the reader stack and thereby improve a selectivity of the reader to independently sense and isolate media transitions.

Reader shield with tilted magnetization

A differentiated sensor includes a pair of magnetic layers having magnetization directions that are substantially antiparallel in a quiescent state. At least one of the magnetic layers is a free layer. A spacer layer is disposed between the pair of magnetic layers.

Single sensor element that is naturally differentiated

The present invention is directed to a spin valve sensor for use in a data storage system, that is adapted to receive a sense current and produce a GMR effect in response to applied magnetic fields. The spin valve sensor includes first and second ferromagnetic free layers, a spacer layer positioned between the first and second ferromagnetic free layers, and a biasing component. The first ferromagnetic free layer has a magnetization (M) in a first direction, when in a quiescent (non-biased) state. The second ferromagnetic free layer has a magnetization (M) in a second direction that is anti-parallel to the first direction, when in a quiescent (non biased) state.

Giant magnetoresistive sensor having selfconsistent demagnetization fields

A magnetoresistive (MR) sensor for use in a magnetic storage system including a magnetic storage media having multiple concentric microtracks with information stored thereon. The MR sensor includes a plurality of generally parallel layers that form an MR stack. The MR sensor also includes a top shield and a bottom shield that are spaced apart on opposite sides of the MR stack in a longitudinal direction. The Mr sensor further includes a first and a second side shield spaced apart on opposite sides of the MR stack in a transverse direction. The top shield, bottom shield, first side shield and second side shield substantially surround the MR stack.

MR structures for high areal density reader by using side shields

Side-reading of an abutted-junction magnetic transducer is measured by constructing at least one microtrack having a transition density. The transducer is moved relative to the microtrack to identify a plurality of positions of the transducer relative to the microtrack where the transducer provides a predetermined response. The side-reading distance of the transducer is identified from the plurality of positions. In one embodiment, a plurality of microtracks are constructed during different iterations, each having a different transition density, and the positions of the transducer are identified during each iteration relative to the respective microtrack. In another embodiment, the selected transition density has a fundamental frequency, and the position of the transducer is identified relative to the microtrack where the transducer provides the predetermined response at each of a plurality of harmonic frequencies of the fundamental frequency.

Process of measuring slide-reading of abutted-junction read heads

A magnetic recording head has an air bearing surface and a magnetic core having a height and a width. The magnetic core is formed in part of a plurality of narrow slices having a plurality of insulating channels interspersed therein along the width of the magnetic core. Each of the plurality of narrow slices extends essentially along the height of the magnetic core.

Growing community of inventors

Lakeville, MN, United States of America

Juan Jose Fernandez-de-Castro