Magneto-resistive element having a free layer provided with...

Details Magneto-resistive element having a free layer provided with... Magneto-resistive element having a free layer provided with...

2006-10-27

2009-08-25

Evans, Jefferson (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07580231

ABSTRACT:
A magneto-resistive element has a pinned layer, a free layer, and a spacer layer which is sandwiched between the pinned layer and the free layer. The spacer layer is made of copper. The magneto-resistive element is configured such that sense current is applied in a direction that is perpendicular to layer surfaces. The free layer has: a nonmagnetic layer that includes copper as a main component; and ternary alloy layers each including cobalt (Co), iron (Fe), and nickel (Ni), the ternary alloy layers being disposed on both sides of the nonmagnetic layer. The ternary alloy layer includes nickel and iron at a composition ratio in which a ratio x of an atomic percentage of nickel to a total atomic percentage of nickel and iron is 27%≦x≦45%.

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