[20a-131-1~11] 【CS.9】 Code-sharing Session of 10.1, 10.2, 10.3 & 10.4

[20a-131-5] Giant spin torque efficiency in CuPt/Co system

〇Shunsuke Yamada¹, Kohda Makoto¹, Rajagopalan Ramaswamy², Karube Shuntaro¹, Hyunsoo Yang², Nitta Junsaku¹ (1.Tohoku Univ., 2.NUS)

Keywords:Spin Hall effect, Spintronics

We investigated a spin torque efficiency in different ordered CuPt alloy by means of spin-torque ferromagnetic resonance (ST-FMR). We changed the crystallinity of CuPt accordingly via annealing and different substrates. Surprisingly, we found the estimated spin torque efficiency is fairly larger than that in CuPt/Py system, especially Si substrate /CuPt(3.5-10nm)/Co(10nm)/AlO_x(2nm) case as shown in Fig. 1, implying that this efficiency is originated from an interface property such as spin mixing conductance.
In this conference, we discuss the origin of the higher efficiency by investigating CuPt and Co thickness dependences systematically.