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arXiv · 1412.4032

Spin waves in micro-structured yttrium iron garnet nanometer-thick films

Matthias B. Jungfleisch·Wei Zhang·Wanjun Jiang·Houchen Chang·Joseph Sklenar·Stephen M. Wu·John E. Pearson·Anand Bhattacharya·John B. Ketterson·Mingzhong Wu·Axel Hoffmann
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Abstract

We investigated the spin-wave propagation in a micro-structured yttrium iron garnet waveguide of $40$ nm thickness. Utilizing spatially-resolved Brillouin light scattering microscopy, an exponential decay of the spin-wave amplitude of $(10.06 \pm 0.83)$ $μ$m was observed. This leads to an estimated Gilbert damping constant of $α=(8.79\pm 0.73)\times 10^{-4}$, which is larger than damping values obtained through ferromagnetic resonance measurements in unstructured films. The theoretically calculated spatial interference of waveguide modes was compared to the spin-wave pattern observed experimentally by means of Brillouin light scattering spectroscopy.

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Matthias B. Jungfleisch, Wei Zhang, Wanjun Jiang, Houchen Chang, Joseph Sklenar, Stephen M. Wu, John E. Pearson, Anand Bhattacharya, John B. Ketterson, Mingzhong Wu, Axel Hoffmann. 2014-12-12. Spin waves in micro-structured yttrium iron garnet nanometer-thick films. https://doi.org/10.1063/1.4916027

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