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Publication Citation: Control of magnetic fluctuations by spin current

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Author(s): Vladislav E. Demidov; Sergei Urazhdin; Eric Edwards; Mark D. Stiles; Robert D. McMichael; Sergej O. Demokritov;
Title: Control of magnetic fluctuations by spin current
Published: September 02, 2011
Abstract: We utilize micro-focus Brillouin light scattering spectroscopy to study the interaction of spin current generated by the spin Hall effect with magnetic fluctuations in a Permalloy microdisc. We show that the fluctuations can be efficiently enhanced or suppressed by different directions of the current. Additionally, we find that the effect of spin current on magnetic fluctuations is strongly influenced by nonlinear magnon-magnon interactions. The observed phenomena can be utilized for controllable reduction of thermal noise in spintronic nanodevices.
Citation: Physical Review Letters
Volume: 107
Issue: 10
Pages: 5 pp.
Keywords: spin-transfer torque; magnetization dynamics; magnetic damping, ferromagnetic resonance; spin current; spin Hall effect; Brillouin light scattering; spin waves;
Research Areas: Nanomagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (872KB)