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- W4381248025 abstract "Many recent papers report on the interest of spinwaves for applications. This paper revisits the propagating spinwave spectroscopy when using inductive transceivers connected to a network analyzer. The spinwave conduit can be made of a non-reciprocal material. The formalism offers a simple and direct method to understand, design and optimize devices harnessing propagating spin waves, including when a unidirectional energy flow is desired. The concept of the mismatch of helicity between the spinwave and the magnetic field radiated by antennas is first clarified. Owing to the form of the susceptibility tensor reflecting the precession ellipticity, there exists specific orientations of the wavevector for which a perfect helicity mismatch is reached. The spinwaves with this orientation and this direction of wavevector are dark in the sense that they do not couple with the inductive antenna. This leads to single-sided wavevector generation, that should not to be confused with a unidirectional emission of energy. A method to calculate the antenna-to-antenna transmission parameter is then provided. Analytical approximations are then applied on situations that illustrate the roles of the direction of the spinwave wavevector versus that of the group velocity. The often-encountered cases of spinwaves possessing either a V-shaped or a flat dispersion relation are revisited. These reciprocal dispersion relations lead to amplitude non-reciprocity because of helicity mismatch. Conversely, for spinwaves with a line-shaped dispersion relation, a quasi-unidirectional emission of spinwaves occurs, which is of interest for applications. This situation can be obtained when using the acoustical spinwaves of synthetic antiferromagnets when the wavevector is close to parallel to the applied field. We finally show that this configuration can be harnessed to design reconfigurable frequency filters." @default.
- W4381248025 created "2023-06-20" @default.
- W4381248025 creator A5018889488 @default.
- W4381248025 date "2023-06-16" @default.
- W4381248025 modified "2023-09-23" @default.
- W4381248025 title "Theory of propagating spin wave spectroscopy using inductive antennas: conditions for unidirectional energy flow" @default.
- W4381248025 doi "https://doi.org/10.48550/arxiv.2306.09716" @default.
- W4381248025 hasPublicationYear "2023" @default.
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