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Hysteresis and control of ferromagnetic resonances in rings
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Optical micrograph of the CPW, light areas are layers on GaAs (dark). (b) Scanning electron micrograph of rings in an array. (c) MFM picture of four rings at . (d) MFM line scans [along the broken line in (c)] for different as quoted at the left axis. Switching fields are clearly identified by the abrupt change in the contrast (cf. white arrows). (e), (f), and (g) are sketches of the reversed onion, the vortex, and the onion state, respectively.

Image of FIG. 2.
FIG. 2.

(a) FMR absorption spectrum for rings at bias field . (b) Gray-scale plot of absorption spectra taken at successively increased bias field starting from . Dark represents strong absorption. (c) Resonance frequencies for increasing (up-sweep: filled symbols) and for decreasing (down-sweep: open symbols). A hysteretic behavior of and abrupt jumps are observed. For comparison due to uniform precession in an unpatterned permalloy film is included (broken line).

Image of FIG. 3.
FIG. 3.

Resonance frequencies for (a) going from (open circles) and (b) a minor loop with (open circles). In the latter case the FMR modes are fully reversible for sweeping back and forth. Gray symbols represent data from the up-sweep in Fig. 2(c). Insets and vertical lines indicate the regimes where the characteristic spin configurations are relevant.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hysteresis and control of ferromagnetic resonances in rings