Phase-coherent current-driven magnons in magnetic multilayers

Tsoi, M.

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Phase-coherent current-driven magnons in magnetic multilayers

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Tsoi, M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Tsoi, M. (2002). Phase-coherent current-driven magnons in magnetic multilayers. Journal of Magnetism and Magnetic Materials, 240(1-3), 103-107.

Cite as: https://hdl.handle.net/21.11116/0000-000E-EF1F-4

Abstract

We report the detection of electromagnetic waves radiated by
current-driven magnons in a Co/Cu magnetic multilayer. The
magnons were excited by means of a high current density
approximate to10(8) A/cm(2) injected into the multilayer
through a point contact. The point contact itself was used as a
high frequency mixer to mix electromagnetic waves radiated by
the current-driven magnons with externally generated microwave
radiation. Here the external microwaves are used as a direct
probe of the high-frequency behavior and partial phase
coherence of the current-induced excitations. When the external
frequency equaled the frequency of the magnons generated in the
multilayer a DC voltage was found to develop across the
contact. Investigation of how this voltage varies with exciting
current, magnetic field, and microwave frequency provides
detailed information on the spectrum of the current-driven
magnons. Our observations support the feasibility of a spin-
wave maser, or spin-wave amplification by stimulated emission
of radiation. (C) 2002 Elsevier Science B.V. All rights
reserved.