Development of energy-efficient on-demand magnonic nanochannels (MNCs) can revolutionize on-chip data communication and processing. We have developed a dynamic MNC array by periodically tailoring perpendicular magnetic anisotropy using the electric field. Brillouin light scattering spectroscopy is used to probe the spin wave (SW) dispersion of MNCs formed by applying a static electric field at the CoFeB/MgO interface through the one-dimensional stripe-like array of indium tin oxide electrodes placed on top of Ta/CoFeB/MgO/Al2O3 heterostructures. Magnonic bands, consisting of two SW frequency modes, appear with a bandgap under the application of moderate gate voltage, which can be switched off by withdrawing the voltage. The experimental results are reproduced by plane wave method–based numerical calculations, and simulated SW mode profiles show propagating SWs through nanochannels with different magnetic properties. The anticrossing between these two modes gives rise to the observed magnonic bandgap.
Harnessing high-frequency
spin dynamics in three-dimensional (3D)
nanostructures may lead to paradigm-shifting, next-generation devices
including high density spintronics and neuromorphic systems. Despite
remarkable progress in fabrication, the measurement and interpretation
of spin dynamics in complex 3D structures remain exceptionally challenging.
Here, we take a first step and measure coherent spin waves within
a 3D artificial spin ice (ASI) structure using Brillouin light scattering.
The 3D-ASI was fabricated by using a combination of two-photon lithography
and thermal evaporation. Two spin-wave modes were observed in the
experiment whose frequencies showed nearly monotonic variation with
the applied field strength. Numerical simulations qualitatively reproduced
the observed modes. The simulated mode profiles revealed the collective
nature of the modes extending throughout the complex network of nanowires
while showing spatial quantization with varying mode quantization
numbers. The study shows a well-defined means to explore high-frequency
spin dynamics in complex 3D spintronic and magnonic structures.
We report on a direct measurement of sizable interfacial Dzyaloshinskii–Moriya interaction (iDMI) at the interface of two-dimensional transition metal dichalcogenide (2D-TMD), MoS2 and Ni80Fe20 (Py), using Brillouin light scattering spectroscopy. A clear asymmetry in spin-wave dispersion is measured in MoS2/Py/Ta, while no such asymmetry is detected in the reference Py/Ta system. A linear scaling of the DMI constant with the inverse of Py thickness indicates the interfacial origin of the observed DMI. We further observe an enhancement of DMI constant in a three to four layer MoS2/Py system (by 56%) as compared to that in two layer MoS2/Py, which is caused by a higher density of MoO3 defect species in the case of three to four layer MoS2. The results open possibilities of spin–orbitronic applications utilizing the 2D-TMD-based heterostructures.
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