Multi-layer magnetoresistive shield with transition metal layer

摘要

A magnetic shield that is capable of enhancing magnetic reading. In accordance with various embodiments, a magnetic element has a magnetically responsive stack shielded from magnetic flux and biased to a predetermined default magnetization by at least one lateral side shield that has a transition metal layer disposed between first and second ferromagnetic layers.

主权项

1. A magnetic element comprising a magnetically responsive stack comprising first and second magnetically free layers and without a fixed magnetization, each layer of the magnetically responsive stack meeting at one of a plurality of stack interfaces oriented parallel to a cross-track direction, each magnetically free layer biased to a predetermined default magnetization and shielded from magnetic flux by a first side shield, the first side shield positioned on a first lateral side of and separated from the magnetically responsive stack, the first side shield comprising first and second transition metal layers respectively disposed between first and second pairs of ferromagnetic layers, each layer of the first side shield meeting at one of a plurality of shield interfaces oriented parallel to the cross-track direction, each stack interface offset from each shield interface along a down-track direction perpendicular to the cross-track direction.