High-output CPP-GMR sensor with synthetic-ferrimagnet free layer and enhanced spin-torque critical currents

Details High-output CPP-GMR sensor with synthetic-ferrimagnet free layer and enhanced spin-torque critical currents High-output CPP-GMR sensor with synthetic-ferrimagnet free layer and enhanced spin-torque critical currents

2008-08-14

arxiv.org/abs/0808.2001v1

Appl. Phys. Lett. 93 102509 (2008)

Physics

Condensed Matter

Materials Science

9 pages (manuscript form), wih 4 embedded figures. Submitted for publication

Scientific paper

It is shown that the maximum stable output of a CPP-GMR sensor is increased significantly by using a synthetic ferrimagnet free layer, provided the electron current flows from free layer to reference layer. This free layer allows a larger magnetoresistance ratio for a given free layer magnetic moment, and in addition results in a greater than three-fold increase in the critical current above which spin-torque instability of the free layer occurs. In read heads with net free layer moments equivalent to only 4.5nm of Ni80Fe20, this effect is shown to result in sustainable sense current densities above 2e8 A/cm2.

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