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Yu, T. (author), Zhang, Xiang (author), Sharma, S. (author), Blanter, Y.M. (author), Bauer, G.E. (author)We theoretically investigate the collective excitations of multiple (sub)millimeter-sized ferromagnets mediated by waveguide photons. By the position of the magnets in the waveguide, the magnon-photon coupling can be tuned to be chiral, i.e., magnons only couple with photons propagating in one direction, leading to an asymmetric transfer of...journal article 2020
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Šimić, Fran (author), Sharma, S. (author), Blanter, Y.M. (author), Bauer, G.E. (author)We propose and model a method to excite a large number of coherent magnons with high momentum in optical cavities. This is achieved by two counterpropagating optical modes that are detuned by the frequency of a selected magnon, similar to stimulated Raman scattering. In submillimeter-size yttrium iron garnet spheres, a milliwatt laser input...journal article 2020
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Yu, T. (author), Zhang, Yu Xiang (author), Sharma, S. (author), Zhang, Xiang (author), Blanter, Y.M. (author), Bauer, G.E. (author)We report strong chiral coupling between magnons and photons in microwave waveguides that contain chains of small magnets on special lines. Large magnon accumulations at one edge of the chain emerge when exciting the magnets by a phased antenna array. This mechanism holds the promise of new functionalities in nonlinear and quantum magnonics.journal article 2020
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Yu, T. (author), Sharma, S. (author), Blanter, Y.M. (author), Bauer, G.E. (author)The chirality of magnetostatic Damon-Eshbach (DE) magnons affects the transport of energy and angular momentum at the surface of magnetic films and spheres. We calculate the surface-disorder-limited dephasing and transport lifetimes of surface modes of sufficiently thick high-quality ferromagnetic films such as yttrium iron garnet. Surface...journal article 2019
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Sharma, S. (author), Rameshti, Babak Zare (author), Blanter, Y.M. (author), Bauer, G.E. (author)Inelastic scattering of photons is a promising technique to manipulate magnons but it suffers from weak intrinsic coupling. We theoretically discuss an idea to increase optomagnonic coupling in optical whispering gallery mode cavities by generalizing a previous analysis to include the exchange interaction. We predict that the optomagnonic...journal article 2019
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Sharma, S. (author), Blanter, Y.M. (author), Bauer, G.E. (author)Inelastic scattering of light by spin waves generates an energy flow between the light and magnetization fields, a process that can be enhanced and controlled by concentrating the light in magneto-optical resonators. Here, we model the cooling of a sphere made of a magnetic insulator, such as yttrium iron garnet, using a monochromatic laser...journal article 2018
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Haigh, J. A. (author), Lambert, N. J. (author), Sharma, S. (author), Blanter, Y.M. (author), Bauer, G.E. (author), Ramsay, A. J. (author)We identify experimentally the magnetostatic modes active for Brillouin light scattering in the optical whispering gallery modes of a yttrium iron garnet sphere. Each mode is identified by magnetic-field dispersion of ferromagnetic-resonance spectroscopy and coupling strength to the known field distribution of the microwave drive antenna. Our...journal article 2018
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Sharma, S. (author), Blanter, Y.M. (author), Bauer, G.E. (author)Brillouin light scattering is an established technique to study magnons, the elementary excitations of a magnet. Its efficiency can be enhanced by cavities that concentrate the light intensity. Here, we theoretically study inelastic scattering of photons by a magnetic sphere that supports optical whispering gallery modes in a plane normal to...journal article 2017