Spin diffusion in the Mn2+ ion system of II-VI diluted magnetic semiconductor heterostructures

TL;DR

This study investigates spin diffusion in Mn-doped II-VI semiconductor heterostructures, combining experimental optical measurements with numerical simulations to understand magnetization dynamics and quantify the spin diffusion coefficient.

Contribution

It provides the first evaluation of the spin diffusion coefficient in (Zn,Mn)Se and demonstrates the significant role of spin diffusion in magnetization dynamics of these heterostructures.

Findings

Spin diffusion coefficient is approximately 7x10^(-8) cm^2/s in Zn(0.99)Mn(0.01)Se.

Spin diffusion significantly influences magnetization dynamics in the studied heterostructures.

Numerical simulations agree well with experimental data on Zeeman splitting and magnetization behavior.

Abstract

The magnetization dynamics in diluted magnetic semiconductor heterostructures based on (Zn,Mn)Se and (Cd,Mn)Te has been studied experimentally by optical methods and simulated numerically. In the samples with nonhomogeneous magnetic ion distribution this dynamics is contributed by spin-lattice relaxation and spin diffusion in the Mn spin system. The spin diffusion coefficient of 7x10^(-8) cm^2/s has been evaluated for Zn(0.99)Mn(0.01)Se from comparison of experimental and numerical results. Calculations of the giant Zeeman splitting of the exciton states and the magnetization dynamics in the ordered alloys and parabolic quantum wells fabricated by the digital growth technique show perfect agreement with the experimental data. In both structure types the spin diffusion has an essential contribution to the magnetization dynamics.