Current-driven microwave dynamics in magnetic point contacts as a function of applied field angle

By William H. Rippard, M. Pufall, S. Kaka, Thomas J. Silva, S. Russek. 2004

179 citations recorded by the source corpus.

We have measured microwave frequency, current-driven magnetization dynamics in point contacts made to 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 .

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/5584d76e82ecaabbc6af2268dbd6e136391dca23

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In Atomic and Molecular Physics, and Optics

In Electrical and Electronic Engineering

In Electronic, Optical and Magnetic Materials

Citations in the corpus

Spin-transfer effects in nanoscale magnetic tunnel junctions (2004, background): “The highest power outputs at room temperature (∼20-100 pW) are seen in point-contact devices [66, 88], which typically also require high fields (∼1 T).”
Nonlinear Auto-Oscillator Theory of Microwave Generation by Spin-Polarized Current (2009, background): “The solid and open circles represent the experimental data from [18]; solid and dashed lines—theoretical calculation [72].”
Approximate theory of microwave generation in a current-driven magnetic nanocontact magnetized in an arbitrary direction (2005, background): “Thus, in the comparison of our theoretical results with the experimental results from [7] and [8] given below, we shall in most cases use the experimentally measured values of instead of calculating them from (37), (36), and (8).”