Heat transport by phonon tunneling across layered structures used in heat assisted magnetic recording

摘要

In this paper, we analyze the heat transport by acoustic waves in arbitrary layered structures that may include several vacuum layers. The analysis is based on our prior description of the spectrum of thermally excited waves in systems with a heat flux, and on the new approach to the coupling between acoustic fields in separated bodies as well as a description of the interference of thermally excited waves. The developed method correctly predicts results for all known special cases for both large and closing gaps, it agrees with the available experimental measurements, and it explains the phenomena of interface thermal resistance as well as thermal rectification (asymmetry of thermal transport). Numerical examples demonstrate the applicability of our approach to the calculation of the heat transport coefficient across nanoscale gaps due to acoustic waves.