Charge pumping and the colored thermal voltage noise in spin valves

Details Charge pumping and the colored thermal voltage noise in spin valves Charge pumping and the colored thermal voltage noise in spin valves

2009-02-13

arxiv.org/abs/0902.2389v2

Phys. Rev. B 79, 174415 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 2 figures

Scientific paper

10.1103/PhysRevB.79.174415

Spin pumping by a moving magnetization gives rise to an electric voltage over a spin valve. Thermal fluctuations of the magnetization manifest themselves as increased thermal voltage noise with absorption lines at the ferromagnetic resonance frequency and/or zero frequency. The effect depends on the magnetization configuration and can be of the same order of magnitude as the Johnson-Nyquist thermal noise. Measuring colored voltage noise is an alternative to ferromagnetic resonance experiments for nano-scale ferromagnetic circuits.

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