| Summary: | A [GeTe/Sb<sub>2</sub>Te<sub>3</sub>] superlattice is known as a topological insulator. It shows magnetic responses such as magneto-optical effect, magneto resistance, magneto capacitance, and so on. We have reported that [GeTe/Sb<sub>2</sub>Te<sub>3</sub>] superlattice film has a large spin–orbit interaction using a spin pumping method of a [GeTe/Sb<sub>2</sub>Te<sub>3</sub>]/Py superlattice. In this paper, we demonstrate a ST-FMR (spin transfer torque ferromagnetic resonance) of the [GeTe/Sb<sub>2</sub>Te<sub>3</sub>]<sub>6</sub>/Py superlattice, compared with a W/Py bilayer. The superlattice film showed a large resonance signal with a symmetric component. The ratio of symmetric components (S) to anti-symmetric (A) components (S/A) was 1.4, which suggests that the superlattice exhibits a large spin Hall angle. The [GeTe/Sb<sub>2</sub>Te<sub>3</sub>] superlattice will be suitable as a hetero-interface material required for high performance spintronics devices in future.
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