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Spin waves turning a corner
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Image of FIG. 1.

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FIG. 1.

(a) Schematic of the investigated structure. A microstrip antenna excites spin waves in a 2-μm wide spin-wave waveguide made of a Au(50 nm)/Py(30 nm) bilayer. 8 μm away from the antenna, the waveguide has a smooth, S-shaped bend. Au contacts at both ends of the waveguide allow for a direct current to flow through the Au/Py bilayer. A, B, and C indicate the BLS measurement positions of the data shown in Fig. 2. (b) Red arrows show the magnetization configuration inside the spin-wave waveguide when applying an external magnetic field. (c) With a direct current flowing through the bilayer, the resultant Oersted field forces the magnetization to always point along the short axis of the waveguide.

Image of FIG. 2.

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FIG. 2.

Empty symbols show the BLS intensity measured as a function of an externally applied magnetic field for excitation frequencies ranging from 2.1 to 3.9 GHz. Filled symbols show the results of the BLS measurement with dc current pulses through the Au/Py bilayer waveguide and without applying an external magnetic field. The measurement positions of panels A, B, and C are indicated in Fig. 1(a); the results were obtained 1 μm, 8 μm, and 11 μm away from the antenna.

Image of FIG. 3.

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FIG. 3.

Two-dimensional intensity distributions of spin waves excited at 2.1 GHz with (a) an externally applied magnetic field of 12.3 mT and (b) applied dc pulses with an amplitude of 66.7 mA. The intensity scale is logarithmic and color-coded.

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/content/aip/journal/apl/101/4/10.1063/1.4738887
2012-07-25
2014-04-21

Abstract

We studied the propagation of spin waves in a Ni81Fe19 micro-waveguide comprising a smooth, S-shaped bend using Brillouin light scattering microscopy. A direct current flowing through a gold wire underneath the Ni81Fe19 provides a local magnetic field, which maintains a transverse magnetization around the bend of the waveguide. It is demonstrated that spin-wave propagation inside the bend can be realized in contrast to the case of an externally applied magnetic field, which generates strong inhomogeneities in the internal effective field distribution, preventing any spin-wave propagation across the bend.

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Scitation: Spin waves turning a corner
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/4/10.1063/1.4738887
10.1063/1.4738887
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