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

Maat, S.; Smith, N.; Carey, M. J.; Childress, J. R.
September 2008
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p103506
Academic Journal
We demonstrate that the addition of Dy capping layers in current perpendicular to the plane giant magnetoresistive spin-valves can increase the critical current density beyond which spin-torque induced instabilities are observed by about a factor of three. 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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