Tunable Angle Dependent Magnetization Dynamics in Ni80Fe20 Nano-cross Structures of Varying Size

TL;DR

This study reveals how the magnetization dynamics in Ni80Fe20 nano-cross structures can be extensively tuned by changing the in-plane magnetic field angle and size, enabling advanced control for magnetic device applications.

Contribution

It demonstrates the angle-dependent magnetization dynamics in nano-cross arrays and provides numerical insights into the mode variations with size and field orientation.

Findings

Angular variation drastically alters spin-wave modes.

Size influences the magnetization dynamics and mode behavior.

Numerical simulations support experimental observations.

Abstract

We demonstrate a large angular dependence of magnetization dynamics in Ni80Fe20 nano-cross arrays of varying sizes. By subtle variation of the azimuthal angle of an in-plane bias magnetic field, the spin configuration and the ensuing spin-wave dynamics, including mode softening, mode splitting, mode crossover and mode merging, can be drastically varied to the extent that a frequency minimum corresponding to mode softening converts to a mode crossover, various mode splitting and mode crossover disappear and additional mode splitting appears. Numerically simulated spin-wave spectra and phase profiles revealed the nature of various spin-wave modes and the origin of above variation of the dynamics with bias-field angle. All of these above observations are further modified with the variation of dimensions of the nano-cross. The numerically calculated magnetostatic field distributions further supports the variation of dynamics with bias-field angle. These results open a new avenue for engineering the nano-cross based magnetic devices such as magnetic storage, spin-wave logic and on-chip data communication devices.