Spin-transfer torque oscillator

Oscillators – Molecular or particle resonant type

Reexamination Certificate

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C331S003000

Reexamination Certificate

active

08063709

ABSTRACT:
The invention relates to a method of operating a spin-transfer torque structure to generate voltage oscillations, said structure comprising a first layer of magnetic material having a fixed magnetization vector, a spacer of non magnetic material and a second layer of magnetic material having a free magnetization vector. The method includes the application of a current (jop) through said structure and a magnetic field (Hext) in the plane of the second layer. It makes use of a region of bistability and hysteretic behaviour to trigger and stop the voltage oscillations.

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Firastrau et al; “State diagram for spin current-induced magnetization dynamics using a perpendicular polarizer and a planar free layer”, Journal of Magnetism and Magnetic Materials, vol. 310, No. 2 Nov. 20, 2006, pp. 2029-2031.
Grollier et al; “Field dependence of magnetization reversal by spin transfer”, Physical Review, B 67, vol. 67, No. 17 May 2003, pp. 174402-1-174402-8.
Mangin et al; Database Inspec [Online] The Institute of Electrical Engineers, Stevenage, GB; Mar. 2006, “Current-induced magnetization reversal in nanopillars with perpendicular anisotrophy” XP002457961 Database accession No. 9386378.
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Mangin et al; “Current-induiced magnetization reversal in nanopillars with perpendicular anistrophy” published in Nature, vol. 5, Mar. 2006, pp. 210-215.
International Search Report for PCT/EP2007/051676.

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