The manipulation of the vortex state in magnetic nanostructures has received a lot of interest in recent decades, with potential applications in nonvolatile magnetic random‐access memory and logic networks. For wireless communication advancements, nano‐sized, and low‐phase‐noise, adjustable transmitter‐receiver networks are critical. Herein, it is shown that by using micromagnetic simulations when the saturation magnetization is reduced in a particular region of a magnetic nanodisk, the frequency tunability in such disks can be achieved. The gyrotropic mode of the vortex core is excited with spin‐polarized current and an in‐plane static magnetic field and found that an isolated magnetic vortex shows different resonance frequencies at different saturation magnetization regions. The dynamics of the mutual synchronization between two such dipolarly coupled magnetic vortices are numerically investigated, and the essential distances at which synchronization occurs are also identified. These incredibly small vortex‐based oscillator devices have linewidths of the order of 40–60 MHz, making them prospective candidates for signal‐processing applications and a strong new tool for basic research on vortex dynamics in magnetic nanostructures.
Compared to the present‐day semiconductor technology in logic gates, which uses the transport properties of electrons, the magnetic analog of logic gates using magnetic vortices has proven to be advantageous in many ways due to its efficiency in terms of negligible electron power leakage and higher switching speed. Based on the asymmetric magnetic vortex transistor (AMVT), a 3‐input OR gate and a majority gate using micromagnetic simulations are demonstrated. Depending on the distances between the three‐input units and the input–output unit and the polarities of the magnetic vortices of the output unit, the networks behave as logic gates. Considering AMVT as one unit, three such units are placed parallel to the input side and another on the output side. Spin‐polarized current is applied to the input units, and the energy is transferred to the output unit owing to the movement of antivortex solitons through the magnetic stray field distribution. Energy transfer is recorded from the output unit, and any energy amplification is considered an ON (1) state, whereas a reduction in energy is considered an OFF (0) state. These “magnetic” logic gate configurations using magnetic vortices can thus behave as fundamental blocks of “magnetic” integrated circuits in the future.
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