Ultrahigh field electron cyclotron resonance absorption in In$_{1-x}$Mn$_x$As films

TL;DR

This study investigates ultrahigh field electron cyclotron resonance in In$_{1-x}$Mn$_x$As films, revealing how Mn doping affects resonance and enabling estimation of exchange coupling constants in this dilute magnetic semiconductor.

Contribution

It provides the first detailed analysis of electron cyclotron resonance in In$_{1-x}$Mn$_x$As films and estimates key exchange parameters using a modified Pidgeon-Brown model.

Findings

Resonance peak shifts to lower fields with increased Mn content.

Estimated exchange coupling constants $eta$ and $eta$ from experimental data.

Validated the modified Pidgeon-Brown model for dilute magnetic semiconductors.

Abstract

We have carried out an ultrahigh field cyclotron resonance study of $n$-type In$_{1-x}$Mn$_x$As films, with Mn composition $x$ ranging from 0 to 12%, grown on GaAs by low temperature molecular beam epitaxy. We observe that the electron cyclotron resonance peak shifts to lower field with increasing $x$. A detailed comparison of experimental results with calculations based on a modified Pidgeon-Brown model allows us to estimate the {\em s-d} and {\em p-d} exchange coupling constants, $\alpha$ and $\beta$, for this important III-V dilute magnetic semiconductor system.