Exchange magnon induced resistance asymmetry in permalloy spin-Hall oscillators

Journal Article · Mon May 09 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4948921· OSTI ID:22591711

Langenfeld, S. ^[1]; Tshitoyan, V.; Fang, Z.; Wells, A.; Moore, T. A. ^[2]

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1. Microelectronics Group, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE (United Kingdom)
2. School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT (United Kingdom)

We investigate magnetization dynamics in a spin-Hall oscillator using a direct current measurement as well as conventional microwave spectrum analysis. When the current applies an anti-damping spin-transfer torque, we observe a change in resistance which we ascribe mainly to the excitation of incoherent exchange magnons. A simple model is developed based on the reduction of the effective saturation magnetization, quantitatively explaining the data. The observed phenomena highlight the importance of exchange magnons on the operation of spin-Hall oscillators.

• OSTI ID: 22591711
• Journal Information: Applied Physics Letters, Vol. 108, Issue 19; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASYMMETRY
DAMPING
DIRECT CURRENT
EXCITATION
MAGNETIZATION
MAGNONS
MICROWAVE RADIATION
MICROWAVE SPECTRA
OPERATION
OSCILLATORS
PERMALLOY
SATURATION
SPIN