Photo-induced magnetization enhancement in two-dimensional weakly anisotropic Heisenberg magnets

TL;DR

This paper demonstrates that light can enhance magnetization in two-dimensional weakly anisotropic Heisenberg magnets by modifying magnetic anisotropy, especially near the critical temperature, enabling potential ultrafast memory control.

Contribution

It reveals how optical modifications of magnetic anisotropy can directly enhance magnetization in 2D magnets, a novel approach for ultrafast magnetic control.

Findings

Light-induced magnetization increases near critical temperature.

Magnetization enhancement linked to anisotropy modifications.

Potential for optical control in ultrafast magnetic memory applications.

Abstract

By comparing the photo-induced magnetization dynamics in simple layered systems we show how light-induced modifications of the magnetic anisotropy directly enhance the magnetization. It is observed that the spin precession in (CH3NH3)2CuCl4, initiated by a light pulse, increases in amplitude at the critical temperature TC. The phenomenon is related to the dependence of the critical temperature on the axial magnetic anisotropy. The present results underline the possibility and the importance of the optical modifications of the anisotropy, opening new paths toward the control of the magnetization state for ultrafast memories.