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(a) Scanning electron micrographs (SEM) image of array of 30 nm thick Permalloy triangular rings. The inset shows an enlarged SEM image of 380 nm-wide equilateral triangular rings with 4.5 μm side length. Shown in (a), (b), (c), and (d) are the SEM images of the final sample with α = 0°, 10°, 20°, and 30°, respectively.
(Color online) (a) M-H loops of 30 nm thick Permalloy triangular rings for field Happ applied along 0° and 30°. (b) FMR traces of the triangular rings with varying θ for Happ = −1400 Oe. Experimental 2D absorption spectra of the triangular rings for (c) θ = 0°, (d) θ = 10°, (e) θ = 20°, and (f) θ = 30°. (g) Angular dependence of FMR frequencies for Happ = −1400 Oe. Dots and solid lines: triangular rings. The dashed lines: reference circular rings with same side width.
The simulated FMR spectra of the triangular rings with (a) θ = 0° and (b) θ = 30° for Happ = −1400 Oe. Simulated 2D absorption spectra oftriangular rings for (c) θ = 0° and (d) θ = 30°. The spatial distributions of the spin precession amplitudes for respective modes are shown as insets in(a)-(b).
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