  We report results of investigation of the phonon and thermal properties of
the exfoliated films of layered single crystals of antiferromagnetic FePS3 and
MnPS3 semiconductors. The Raman spectroscopy was conducted using three
different excitation lasers with the wavelengths of 325 nm (UV), 488 nm (blue),
and 633 nm (red). The resonant UV-Raman spectroscopy reveals new spectral
features, which are not detectable via visible Raman light scattering. The
thermal conductivity of FePS3 and MnPS3 thin films was measured by two
different techniques: the steady-state Raman optothermal and transient
time-resolved magneto-optical Kerr effect. The Raman optothermal measurements
provided the orientation-average thermal conductivity of FePS3 to be 1.35 W/mK
at room temperature. The transient measurements revealed that the through-plane
and in-plane thermal conductivity of FePS3 is 0.85 W/mK and 2.7 W/mK,
respectively. The films of MnPS3 have higher thermal conductivity of 1.1 W/mK
through-plane and 6.3 W/mK in-plane. The data obtained by both techniques
reveal strong thermal anisotropy of the films and the dominant contribution of
phonons to heat conduction. Our results are important for the proposed
applications of the antiferromagnetic semiconductor thin films in spintronic
devices.
