Suppression of spin-torque in current perpendicular to the plane spin-valves by addition of Dy cap layers

Details Suppression of spin-torque in current perpendicular to the plane spin-valves by addition of Dy cap layers Suppression of spin-torque in current perpendicular to the plane spin-valves by addition of Dy cap layers

2008-08-14

arxiv.org/abs/0808.2030v1

Appl. Phys. Lett. 93 103506 (2008)

Physics

Condensed Matter

Other Condensed Matter

13 pages (manuscript form), with 5 figures. Submitted for publication

Scientific paper

10.1063/1.2978958

We demonstrate that the addition of Dy capping layers in current perpendicular to the plane giant magneto-resistive spin-valves can increase the critical current density beyond which spin-torque induced instabilities are observed by about a factor of three. Current densities as high as 5e7 A/cm2 are measured provided that the electron current flows from the free to the reference layer. While Dy capped samples exhibit nonmagnetic 1/f noise, it is sufficiently small to be unimportant for read head operation at practical data rates.

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