Magnetization reversal using excitation of collective modes in nanodot matrices

TL;DR

This paper proposes a microwave excitation method to selectively reverse the magnetization of a single nanodot within a matrix by exploiting collective modes and spatial anomalies, advancing magnonic crystal applications.

Contribution

It introduces a novel technique for targeted nanodot reversal using collective mode excitation and provides a theoretical and numerical validation of this approach.

Findings

Numerical simulations confirm single-dot switching capability.

Theoretical model explains the collective mode excitation mechanism.

Potential application in magnonic crystals and magnetic recording.

Abstract

The large arrays of magnetic dots are the building blocks of magnonic crystals and the emerging bit patterned media for future recording technology. In order to fully utilize the functionalities of high density magnetic nanodots, a method for the selective reversal of a single nanodot in a matrix of dots is desired. We have proposed a method for magnetization reversal of a single nanodot with microwave excitation in a matrix of magneto-statically interacting dots. The method is based on the excitation of collective modes and the spatial anomaly in the microwave power absorption. We perform numerical simulations to demonstrate the possibility of switching a single dot from any initial state of a 3 by 3 matrix of dots, and develop a theoretical model for the phenomena. We discuss the applicability of the proposed method for introducing defect modes in magnonic crystals as well as for future magnetic recording.