Time-resolved study of nonlinear three-magnon processes in yttrium iron garnet films

Journal Article · 25 January 2019 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.99.024429 · OSTI ID:1611020

Liu, H. J. Jason ^[1]; Riley, Grant A. ^[2]; Ordóñez-Romero, César L. ^[3]; Kalinikos, Boris A. ^[4]; Buchanan, Kristen S. ^[2]

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1. Colorado State Univ., Fort Collins, CO (United States); Georgia Southern Univ., Statesboro, GA (United States); DOE/OSTI
2. Colorado State Univ., Fort Collins, CO (United States)
3. Univ. Nacional Autónoma de México (Mexico)
4. St. Petersburg Electrotechnical Univ. (Russia)

In this work, the temporal aspects of two nonlinear spin-wave processes, i.e., three-magnon splitting and confluence, were investigated in a yttrium iron garnet film. Three-magnon splitting involves the conversion of a magnon at the microwave pumping frequency f_p into two magnons, each with a frequency near f_p/2, while confluence refers to the subsequent combination of two of the split magnons into one with frequency f_c < f_p. Time-resolved Brillouin scattering measurements confirm that these processes occur close to the driving antenna (<1.7mm away), which is expected. Here, the data indicate, however, that magnons with larger group velocities are more likely to undergo confluence, which is not predicted by existing theory. Understanding the details of the splitting and confluence processes may have important implications for the use of short-wavelength spin waves for spintronic devices.

• Research Organization: Colorado State Univ., Fort Collins, CO (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0008149
• OSTI ID: 1611020
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 99; ISSN 2469-9950
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English