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arXiv · 0808.2030

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

S. Maat·N. Smith·M. J. Carey·J. R. Childress
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Abstract

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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S. Maat, N. Smith, M. J. Carey, J. R. Childress. 2008-08-14. Suppression of spin-torque in current perpendicular to the plane spin-valves by addition of Dy cap layers. https://doi.org/10.1063/1.2978958

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