Current-Driven Microwave Dynamics in Magnetic Point Contacts as a Function of Applied Field Angle

Details Current-Driven Microwave Dynamics in Magnetic Point Contacts as a Function of Applied Field Angle Current-Driven Microwave Dynamics in Magnetic Point Contacts as a Function of Applied Field Angle

2004-05-24

arxiv.org/abs/cond-mat/0405558v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.70.100406

We have measured microwave frequency, current-driven magnetization dynamics in point contacts made to Co90Fe10/Cu/ Ni80Fe20 spin valves as a function of applied field strength and angle relative to the film plane. As the field direction is varied from parallel to nearly perpendicular, the device power output increases by roughly two orders of magnitude while the frequencies of the excitations decrease. For intermediate angles the excited frequency does not monotonically vary with applied current and also exhibits abrupt, current-dependent jumps. For certain ranges of current, and applied field strength and direction, the excitation linewidths decrease to a few megahertz, leading to quality factors over 18,000.

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