More Like this

1. Ultrastrong magnon-magnon coupling and chiral spin-texture control in a dipolar 3D multilayered artificial spin-vortex ice

   https://doi.org/10.1038/s41467-024-48080-z  

   Dion, Troy; Stenning, Kilian D.; Vanstone, Alex; Holder, Holly H.; Sultana, Rawnak; Alatteili, Ghanem; Martinez, Victoria; Kaffash, Mojtaba Taghipour; Kimura, Takashi; Oulton, Rupert F.; et al (May 2024, Nature Communications)

   Strongly-interacting nanomagnetic arrays are ideal systems for exploring reconfigurable magnonics. They provide huge microstate spaces and integrated solutions for storage and neuromorphic computing alongside GHz functionality. These systems may be broadly assessed by their range of reliably accessible states and the strength of magnon coupling phenomena and nonlinearities. Increasingly, nanomagnetic systems are expanding into three-dimensional architectures. This has enhanced the range of available magnetic microstates and functional behaviours, but engineering control over 3D states and dynamics remains challenging. Here, we introduce a 3D magnonic metamaterial composed from multilayered artificial spin ice nanoarrays. Comprising two magnetic layers separated by a non-magnetic spacer, each nanoisland may assume four macrospin or vortex states per magnetic layer. This creates a system with a rich 16^Nmicrostate space and intense static and dynamic dipolar magnetic coupling. The system exhibits a broad range of emergent phenomena driven by the strong inter-layer dipolar interaction, including ultrastrong magnon-magnon coupling with normalised coupling rates of$$\frac{\Delta f}{\nu }=0.57$$ $\frac{\Delta f}{\nu }=0.57$, GHz mode shifts in zero applied field and chirality-control of magnetic vortex microstates with corresponding magnonic spectra. 

   more » « less
2. Relation between unidirectional spin Hall magnetoresistance and spin current-driven magnon generation

   https://doi.org/10.1063/1.5044737  

   Borisenko, I. V.; Demidov, V. E.; Urazhdin, S.; Rinkevich, A. B.; Demokritov, S. O. (August 2018, Applied Physics Letters)
3. Giant magneto-spin-Seebeck effect and magnon transfer torques in insulating spin valves

   https://doi.org/10.1063/1.5018411  

   Cheng, Yihong; Chen, Kai; Zhang, Shufeng (January 2018, Applied Physics Letters)
4. Nonlinear multi-magnon scattering in artificial spin ice

   https://doi.org/10.1038/s41467-023-38992-7  

   Lendinez, Sergi; Kaffash, Mojtaba T.; Heinonen, Olle G.; Gliga, Sebastian; Iacocca, Ezio; Jungfleisch, M. Benjamin (June 2023, Nature Communications)

   Abstract Magnons, the quantum-mechanical fundamental excitations of magnetic solids, are bosons whose number does not need to be conserved in scattering processes. Microwave-induced parametric magnon processes, often called Suhl instabilities, have been believed to occur in magnetic thin films only, where quasi-continuous magnon bands exist. Here, we reveal the existence of such nonlinear magnon-magnon scattering processes and their coherence in ensembles of magnetic nanostructures known as artificial spin ice. We find that these systems exhibit effective scattering processes akin to those observed in continuous magnetic thin films. We utilize a combined microwave and microfocused Brillouin light scattering measurement approach to investigate the evolution of their modes. Scattering events occur between resonance frequencies that are determined by each nanomagnet’s mode volume and profile. Comparison with numerical simulations reveals that frequency doubling is enabled by exciting a subset of nanomagnets that, in turn, act as nanosized antennas, an effect that is akin to scattering in continuous films. Moreover, our results suggest that tunable directional scattering is possible in these structures. 

   more » « less
5. Engineering antiferromagnetic magnon bands through interlayer spin pumping

   https://doi.org/10.1103/PhysRevApplied.23.L031003  

   Subedi, MM; Deng, K.; Xiong, Y.; Mongeon, J.; Hossain, MT; Meisenheimer, PB; Zhou, ET; Heron, JT; Jungfleisch, MB; Zhang, W.; et al (March 2025, Physical Review Applied)