Microwave acoustic properties of diamond based HBAR at low temperatures

Abstract

Original technique for low-temperature microwave acoustic investigations of single crystalline diamond by HBAR operating on bulk acoustic wave has been developed for the first time. Study of the temperature and frequency dependences for HBAR's quality factor in experimental samples as Al/AlN/Mo/diamond was carried out in a wide frequency range 0.5–10 GHz and temperatures of 4–400 K. The transition between Akhiezer's and Landau-Rumer's acoustic attenuation modes in diamond has been investigated in details.