Searched for: author:"Bauer, G.E."
(1 - 20 of 36)

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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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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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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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Elyasi, M. (author), Blanter, Y.M. (author), Bauer, G.E. (author)
We theoretically explore nonlinearities of ferromagnets in microwave cavities in the classical and quantum regimes and assess the resources for quantum information, i.e., fluctuation squeezing and bipartite entanglement. The (semi)classical analysis of the anharmonic oscillator (Duffing) model for the Kittel mode when including all other...
journal article 2020
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Wang, Hanchen (author), Chen, Jilei (author), Yu, T. (author), Liu, Chuanpu (author), Guo, Chenyang (author), Liu, Song (author), Shen, Ka (author), Jia, Hao (author), Bauer, G.E. (author)
Nanomagnets are widely used to store information in non-volatile spintronic devices. Spin waves can transfer information with low-power consumption as their propagations are independent of charge transport. However, to dynamically couple two distant nanomagnets via spin waves remains a major challenge for magnonics. Here we experimentally...
journal article 2020
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Yu, T. (author), Bauer, G.E. (author)
The angular momentum of evanescent light fields has been studied in nano-optics and plasmonics but not in the microwave regime. Here we predict noncontact pumping of electron spin currents in conductors by the evanescent stray fields of excited magnetic nanostructures. The coherent transfer of the photon to the electron spin is proportional...
journal article 2020
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Rückriegel, Andreas (author), Streib, S.D. (author), Bauer, G.E. (author), Duine, Rembert A. (author)
We develop a microscopic theory of spin-lattice interactions in magnetic insulators, separating rigid-body rotations and the internal angular momentum, or spin, of the phonons, while conserving the total angular momentum. In the low-energy limit, the microscopic couplings are mapped onto experimentally accessible magnetoelastic constants. We...
journal article 2020
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Zhang, Xiang (author), Bauer, G.E. (author), Yu, T. (author)
We propose a method to control surface phonon transport by weak magnetic fields based on the pumping of surface acoustic waves (SAWs) by magnetostriction. We predict that the magnetization dynamics of a nanowire on top of a dielectric films injects SAWs with opposite angular momenta into opposite directions. Two parallel nanowires form a...
journal article 2020
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Bertelli, I. (author), Carmiggelt, J.J. (author), Yu, T. (author), Simon, B.G. (author), Pothoven, C.C. (author), Bauer, G.E. (author), Blanter, Y.M. (author), Aarts, J.M. (author), van der Sar, T. (author)
Spin waves-the elementary excitations of magnetic materials-are prime candidate signal carriers for low-dissipation information processing. Being able to image coherent spin-wave transport is crucial for developing interference-based spin-wave devices. We introduce magnetic resonance imaging of the microwave magnetic stray fields that are...
journal article 2020
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Yu, T. (author), Liu, Chuanpu (author), Yu, Haiming (author), Blanter, Y.M. (author), Bauer, G.E. (author)
We theoretically investigate the interlayer dipolar and exchange couplings between an array of metallic magnetic nanowires grown on top of an extended ultrathin yttrium iron garnet film. The calculated interlayer dipolar coupling agrees with observed anticrossings [Chen et al., Phys. Rev. Lett. 120, 217202 (2018)PRLTAO0031-900710.1103...
journal article 2019
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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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Chen, Jilei (author), Yu, T. (author), Liu, Chuanpu (author), Liu, Tao (author), Madami, Marco (author), Shen, Ka (author), Zhang, J (author), Blanter, Y.M. (author), Bauer, G.E. (author)
Magnon spintronics is a prosperous field that promises beyond-CMOS technology based on elementary excitations of the magnetic order that act as information carriers for future computational architectures. Unidirectional propagation of spin waves is key to the realization of magnonic logic devices. However, previous efforts to enhance the...
journal article 2019
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Yu, T. (author), Blanter, Y.M. (author), Bauer, G.E. (author)
We report a theory for the coherent and incoherent chiral pumping of spin waves into thin magnetic films through the dipolar coupling with a local magnetic transducer, such as a nanowire. The ferromagnetic resonance of the nanowire is broadened by the injection of unidirectional spin waves that generates a nonequilibrium magnetization in only...
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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Streib, S.D. (author), Vidal-Silva, Nicolas (author), Shen, Ka (author), Bauer, G.E. (author)
We address the theory of magnon-phonon interactions and compute the corresponding quasiparticle and transport lifetimes in magnetic insulators, with a focus on yttrium iron garnet at intermediate temperatures from anisotropy- and exchange-mediated magnon-phonon interactions, the latter being derived from the volume dependence of the Curie...
journal article 2019
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Streib, S.D. (author), Keshtgar, Hedyeh (author), Bauer, G.E. (author)
We theoretically investigate pumping of phonons by the dynamics of a magnetic film into a nonmagnetic contact. The enhanced damping due to the loss of energy and angular momentum shows interference patterns as a function of the resonance frequency and magnetic film thickness that cannot be described by viscous ("Gilbert") damping. The phonon...
journal article 2018
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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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Zare Rameshti, Babak (author), Bauer, G.E. (author)
The interaction between two magnetic spheres in microwave cavities is studied by Mie scattering theory beyond the magnetostatic and rotating wave approximations. We demonstrate that two spatially separated dielectric and magnetic spheres can be strongly coupled over a long distance by the electric field component of standing microwave cavity...
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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Shen, K. (author), Bauer, G.E. (author)
We develop a theory of spin wave dynamics excited by ultrafast focused laser pulses in a magnetic film. We take into account both the volume and surface spin wave modes in the presence of applied, dipolar and magnetic anisotropy fields and include the dependence on laser spot exposure size and magnetic damping. We show that the sound waves...
journal article 2018
Searched for: author:"Bauer, G.E."
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