Tunable energy transfer between dipolar-coupled magnetic disks by stimulated vortex gyration

TL;DR

This paper demonstrates a new, tunable, low-energy energy transfer mechanism between dipolar-coupled magnetic disks via stimulated vortex gyration, with potential applications in low-power information processing devices.

Contribution

It introduces a novel energy transfer method between magnetic disks using stimulated vortex gyration, experimentally validated with time-resolved X-ray microscopy.

Findings

Energy transfer rate is tunable via dipolar interaction

Low-power input signals enable efficient transfer

Mechanism operates effectively above room temperature

Abstract

A wide variety of coupled harmonic oscillators exist in nature1. Coupling between different oscillators allows for the possibility of mutual energy transfer between them2-4 and the information-signal propagation5,6. Low-energy input signals and their transport with low-energy dissipation are the key technical factors in the design of information processing devices7. Here, utilizing the concept of coupled oscillators, we experimentally demonstrated a robust new mechanism for energy transfer between spatially separated dipolar-coupled magnetic disks - stimulated vortex gyration. Direct experimental evidence was obtained by time-resolved soft X-ray microscopy. The rate of energy transfer from one disk to the other was deduced from the two normal modes' frequency splitting caused by dipolar interaction. This mechanism provides the advantages of tunable energy transfer rate, low-power input signal, and low-energy dissipation for magnetic elements with negligible damping. Coupled vortex-state disks are promising candidates for information-signal processing devices that operate above room temperature.