(Color online) (A) Scanning electron microscope image of the double-disk sample along with a schematic configuration for dV/dI measurements (Ref. 16). (B) Transmission and (C) spin rectification experimental configurations (Ref. 14). (D) Layout for modified transmission measurement technique with a bridge circuit. Within (D), (a) and (b) label a series of a 90° hybrid couplers and an attenuator, respectively, (c) indicates a differential phase shifter and (d) is a power combiner.
(Color online) A series of magnetization responses as a function of external dc in-plane magnetic field for (A) the 2 × 8 μm2 rectangular and (B) the double-disc (r = 1.5 μm) with dV/dI (curves 1), RF transmission (curves 2), and spin rectification (curves 3) techniques. The arrows indicate the field sweep.
(Color online) Spectra of a rectangular-patterned element obtained by rectification and dV/dI techniques. The arrows pointing down indicate vortex resonant frequencies and the arrows pointing up represent DW motion frequencies. A constant field of 1840 A/m was applied.
(Color online) FMR measurements for (A) rectangular and (B) double-disk elements. In (A), curves (1) and (2) are rectification measurements, curves (3) and (4) show transmission measurements, and curve 5 shows measurements made with a bridge circuit. Curves (1) and (2) in (B) show rectification measurements and curve (3) was obtained by a measurement with the bridge circuit. The triangles indicate the positions to be FMR.
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