Layer-Selective Magnetization Switching in the Chirped Photonic Crystal with GdFeCo

TL;DR

This paper introduces a chirped magnetophotonic crystal structure enabling layer-specific magnetization switching using ultrashort laser pulses of different wavelengths, with potential applications in high-density data storage.

Contribution

It presents a novel multilayer magnetophotonic crystal design that achieves selective magnetization control at different wavelengths, advancing data storage technology.

Findings

Selective magnetization switching demonstrated at different wavelengths.

Potential for miniaturized data storage units.

Magneto-optical reading feasibility discussed.

Abstract

Here we propose a magnetophotonic structure for the layer-selective magnetization switching with ultrashort laser pulses of different wavelengths. It is based on a chirped magnetophotonic crystal (MPC) containing magnetic GdFeCo and nonmagnetic dielectric layers. At each operating wavelength the laser pulses heat up to necessary level only one GdFeCo layer that leads to its magnetization reversal without any impact on the magnetization of the other layers. Moreover, magneto-optical reading of the MPC magnetization state is discussed. Lateral dimensions of the considered MPC can be made small enough to operate as a unit cell for data storage.