Invention Grant
US09087525B2 Layered synthetic anti-ferromagnetic upper shield 有权
分层合成反铁磁上护罩

Layered synthetic anti-ferromagnetic upper shield
Abstract:
A magneto-resistive (MR) sensor may include a variety of individual functional layers whereby an electrical resistance throughout the layers of the sensor stack varies according to the polarity of a pinned layer within the sensor stack. A layered synthetic anti-ferromagnetic (SAF) upper shield of the MR sensor includes an upper SAF layer and a lower SAF layer separated by a shield anti-ferromagnetic (AFM) layer. The lower SAF layer is in contact with a side shield of the MR sensor, which provides a side shield biasing field to the MR sensor. The upper SAF layer separates the lower SAF layer from a top shield and/or domain control structure (DCS) magnet(s) of the MR sensor and shields the lower SAF layer and the sensor stack from DCS stray field(s), thereby reducing noise.
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