Magnon confinement in a nanomagnonic waveguide by a magnetic Moiré superlattice
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913537488584704 |
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| author | Chen, Jilei Madami, Marco Gubbiotti, Gianluca Yu, Haiming |
| author_facet | Chen, Jilei Madami, Marco Gubbiotti, Gianluca Yu, Haiming |
| contents | The study of moiré superlattices has revealed intriguing phenomena in electronic systems, including unconventional superconductivity and ferromagnetism observed in magic-angle bilayer graphene. This approach has recently been adapted to the field of magnonics. In this Letter, we investigate the confinement of spin waves in a nanomagnonic waveguide integrated on top of a magnetic moiré superlattice. Our numerical analysis reveals a magnonic flat-band at the centre of the Brillouin zone, created by a 3.5 degrees twist in the moiré superlattice. The flat-band, characterized by a high magnon density of states and a zero group velocity, allows for the confinement of magnons within the AB stacking region. The flat-band results from the mode anticrossing of several different magnon bands, covering a wavevector range of nearly 40 rad/μm and a 166 nm wide spatial distribution of the magnon trapping in the waveguide. Our results pave the way for nanomagnonic devices and circuits based on spin-wave trapping in magnon waveguides. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_05765 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnon confinement in a nanomagnonic waveguide by a magnetic Moiré superlattice Chen, Jilei Madami, Marco Gubbiotti, Gianluca Yu, Haiming Mesoscale and Nanoscale Physics The study of moiré superlattices has revealed intriguing phenomena in electronic systems, including unconventional superconductivity and ferromagnetism observed in magic-angle bilayer graphene. This approach has recently been adapted to the field of magnonics. In this Letter, we investigate the confinement of spin waves in a nanomagnonic waveguide integrated on top of a magnetic moiré superlattice. Our numerical analysis reveals a magnonic flat-band at the centre of the Brillouin zone, created by a 3.5 degrees twist in the moiré superlattice. The flat-band, characterized by a high magnon density of states and a zero group velocity, allows for the confinement of magnons within the AB stacking region. The flat-band results from the mode anticrossing of several different magnon bands, covering a wavevector range of nearly 40 rad/μm and a 166 nm wide spatial distribution of the magnon trapping in the waveguide. Our results pave the way for nanomagnonic devices and circuits based on spin-wave trapping in magnon waveguides. |
| title | Magnon confinement in a nanomagnonic waveguide by a magnetic Moiré superlattice |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.05765 |