Initial magnetisation angle dependence for microwave oscillation in a metallic spin valve


Initial magnetisation angle dependence for microwave oscillation in a metallic spin valve

Fowley, C.; Bernert, K.; Sluka, V.; Fassbender, J.; Deac, A. M.; Rippard, W. H.; Pufall, M. R.; Russek, S. E.

In order for spin transfer torque oscillators to find their way to applications, the problems of obtaining high output power and low frequency linewidth must be solved. To this end differing geometries have been proposed and near zero applied field large high power microwave emission has been obtained [1,2]. One contains an out-of-plane polariser and an in-plane free layer [1], while the other contains an in-plane polariser and an out-of-plane free layer [2]. The former device has the requirement of a third layer in order to read out the magnetoresistance (MR) signal, whereas in the latter device the polariser functions as the reference layer.

[1] Houssameddine, D., et al., Nature Mater. 6, 447 (2007).
[2] Rippard, W. H., et al., Phys. Rev. B 81, 014426 (2010).

Keywords: spin transfer torque; spin transfer oscillators; perpendicular magnetic anisotropy; macrospin approximation

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