Magnonics: Spin Waves Connecting Charges, Spins and Photons

Abstract

Spin waves (SW) are the excitation of the spin system in a ferromagnetic condensed matter body. They are collective excitations of the electron system and, from a quasi-classical point of view, can be understood as a coherent precession of the electrons' spins. Analogous to photons, they are also referred to as magnons indicating their quasi-particle character. The collective nature of SWs is established by the short-range exchange interaction as well as the non-local magnetic dipolar interaction, resulting in coherence of SWs from mesoscopic to even macroscopic length scales. As one consequence of this collective interaction, SWs are "charge current free" and, therefore, less subject to dissipation caused by scattering with impurities on the atomic level. This is a clear advantage over diffusive transport in spintronics that not only uses the charge of an electron but also its spin degree of freedom. Any (spin) current naturally involves motion and, thus, scattering of electrons leading to excessive heating as well as losses. This renders SWs a promising alternative to electric (spin) currents for the transport of spin information - one of the grand challenges of condensed matter physics.

arXiv commentEditorial foreword, 5 pages, 1 figure

References in corpus (5)

• Collective spin excitations of helices and magnetic skyrmions: review and perspectives of magnonics in non-centrosymmetric magnets
• Sub-micrometer yttrium iron garnet LPE films with low ferromagnetic resonance losses
• Spin Currents and Magnon Dynamics in Insulating Magnets
• Spin wave surface states in one-dimensional planar magnonic crystals
• Pumping laser excited spins through MgO barriers

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• Theoretical realization of rich magnon topology by symmetry-breaking in honeycomb bilayer ferromagnets
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• Magnon, doublon and quarton excitations in 2D S=1/2 trimerized Heisenberg models
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• Optical spin-wave detection beyond the diffraction limit
• Single crystal studies and electronic structure investigation of a room-temperature semiconductor NaMnAs
• Ultra-low magnetic damping in Co 2 Mn-based Heusler compounds: promising materials for spintronic