Energetic and reversible modulation in thermal conductivity can understand environment friendly warmth vitality administration in lots of functions corresponding to thermoelectrics. With first-principles calculations, this research experiences an enormous thermal switching ratio of 12, a lot larger than earlier reported values, in monolayer 2H-VSe2 above room temperature. Detailed evaluation signifies that the excessive thermal switching ratio is dominated by ferromagnetic ordering induced phonon bandgap, which considerably suppresses the phonon-phonon scattering section area throughout all the vibration spectrum. The thermal switching in bulk 2H-VSe2 can also be investigated and the thermal switching ratio reaches 9.2 on the magnetic transition temperature. Each phonon-phonon scattering area section and phonon anharmonicity are accountable to the 9.2-fold thermal switching. This research advances the understanding of warmth vitality transport in two-dimensional ferromagnets, additionally gives new perception for warmth vitality management and conversion.
