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Microwave assisted resonant domain wall nucleation in permalloy nanowires
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Optical microscopy image of the nanowire device along with schematic illustration of the experimental setup. The area trimmed by the dotted line indicates where the 30 nm thick SiO2 isolation pad is inserted. (b)and (c) Typical waveforms captured by the oscilloscope for various fields H and pulse amplitudes: (b) −0.8 V and (c) −0.5 V. (d) Field H needed to assist domain wall nucleation (assisting field) plotted against the current that flows along line B during the pulse application.

Image of FIG. 2.
FIG. 2.

(a)–(c) Representative scope waveforms for different fields H and microwave frequencies. The microwave power is set to 0 dBm. (d) Scope signal amplitude plotted as a function of field H for various fRF. The arrow illustrates the “assisting field” for fRF = 3.0 GHz. (e) Assisting field versus the current amplitude that flows through line A when the microwave current is applied. The arrow shows the point that corresponds to the arrow shown in (d).

Image of FIG. 3.
FIG. 3.

(a) The nucleation field, i.e., the sum of the Oersted field and the assisting field (shown in Figs. 1(d) and 2(e)), plotted as a function of the Oersted field at the field generation line. Squares: parallel pulse field, circles: transverse pulse field, up triangles: transverse microwave field (0.1 GHz), and down triangles: transverse microwave field (3.0 GHz). (b) Nucleation field versus the microwave frequency when the microwave Oersted field at line A is set to ∼27 Oe (microwave power of 0 dBm), as shown by the vertical dotted line in (a). (c) Optical micrograph of the device used to study the ferromagnetic resonance frequency. The blue dotted lines represent the permalloy Hall bar. (d) Microwave frequency applied to the waveguide versus the absolute mean of the field where the largest peaks are observed in the FMR measurements. Line is guide to the eye. Inset: wire resistance versus magnetic field when microwave current (frequency: 9.5 GHz) is applied to the waveguide.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microwave assisted resonant domain wall nucleation in permalloy nanowires