[18p-E216-1~10] 10.4 Semiconductor spintronics, superconductor, multiferroics

▲ [18p-E216-7] Crystal Growth and Evaluation of BiSb Topological Insulator by Sputter Deposition

〇Fan Tuo¹, Mustafa Tobah^1,2, Takanori Shirokura¹, Nguyen Huynh Duy Khang¹, Pham Nam Hai^1,3,4 (1.Tokyo Tech., 2.Univ. Illinois, UC., 3.Univ. Tokyo, 4.JST-CREST)

Keywords:topological insulator, BiSb

BiSb topological insulator is a promising candidate for spin-orbit torque (SOT) magnetoresistive random-access memory (MRAM), due to its giant spin Hall effect (spin Hall angle is 52) and high electrical conductivity at room temperature. However, high quality single crystalline BiSb thin films have been obtained only by molecular beam epitaxy (MBE), which is not used in MRAM manufacturing. In this work, we investigated the characteristics of BiSb thin films fabricated by radio frequency (RF) magnetron sputtering on sapphire substrates. We show that the sputtered BiSb thin films have relatively good crystal quality and high electrical conductivity, which are promising for MRAM applications.