CPP magnetic sensing element in which pinned magnetic layers of upper and lower multilayer films are magnetized antiparallel to each other, method for making the same, and magnetic sensing device including the same

摘要

A magnetic sensing element includes a lower multilayer film including a lower pinned magnetic layer, a lower nonmagnetic layer, a free magnetic layer, an upper nonmagnetic layer, and an upper pinned magnetic layer; and an upper multilayer film including a lower pinned magnetic layer, a lower nonmagnetic layer, a free magnetic layer, an upper nonmagnetic layer, and an upper pinned magnetic layer. Each pinned magnetic layer includes a first pinned magnetic sublayer, a second pinned magnetic sublayer, and an intermediate nonmagnetic sublayer. By setting the magnetization direction of the second pinned magnetic sublayers in the lower multilayer film antiparallel to the second pinned magnetic sublayers in the upper multilayer film, the magnetic sensing element can output a pulsed signal directly when moving over a magnetization transition region.