Microwave helicon propagation and the dynamic magnetic susceptibility inHg1−xMnxSe

Abstract

The electronic and magnetic properties of the "semimagnetic" semiconductor ${\mathrm{Hg}}_{1-x}{\mathrm{Mn}}_x\mathrm{Se}$ ($x\approx 0.06$) are studied by microwave helicon transmission. Experiments are carried out at 35 GHz in the temperature range 4.2-90 K, and in magnetic fields up to 60 kG. The helicon wave dispersion and damping provide a measurement of the free-electron concentration and mobility. Near the electron paramagnetic resonance (EPR) of the ${\mathrm{Mn}}^{2+}$ ions helicon transmission shows pronounced EPR absorption and dispersion, which yield the real and imaginary parts of the dynamic magnetic susceptibility of ${\mathrm{Hg}}_{1-x}{\mathrm{Mn}}_x\mathrm{Se}$. In addition to providing the EPR position and linewidth, this measurement also determines the value of the static magnetic susceptibility of the ${\mathrm{Mn}}^{2+}$ ion subsystem.