Dresden 2020 – wissenschaftliches Programm
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CPP 25.8: Vortrag
Montag, 16. März 2020, 16:45–17:00, HSZ 101
Biologically encoded magnonics — •Benjamin Zingsem1, Thomas Feggeler1, Ralf Meckenstock1, Michael Farle1, and Michael Winklhofer1,2 — 1University Duisburg-Essen — 2Universität Oldenburg
We report on the spectral properties of spin-waves (magnons) in individual chains of dipolar coupled magnetite nanoparticles. The particle-chains are biologically produced in magnetotactic bacteria. Straight chains where obtained from wild-type, curved and looped chains form mutant bacteria. A strong link between distinct spectral properties of the chains and their geometrical arrangement is identified, paving the way towards genetically engineered spin-wave computing on the nanoscale. Each chain consists of ca. 12 nanoparticles with a diameter of about 30 nm, separated by a spacing of about 8 nm. Ferromagnetic resonance spectroscopy was employed to measure the magnonic Eigenstates of each single particle in the chain as a function of the magnitude and direction of an applied magnetic field. The measurements are supplemented with micromagnetic simulations, which reveal the origin of spectral features such as band repulsion and attraction in resonant eigenstates. The emergent topology of the spin-wave band structure exhibits functional properties such as band deflection and band deformation, which may be harnessed in energy efficient magnon computing  and neuro-inspired magnonic networks. Future nanomagnonic devices may be self-assembled via genetic engineering of magnetotactic bacteria.
 B. Zingsem, et al. Nat Commun 10, 4345 (2019)