Spin pumping into carbon nanotubes

カーボンナノチューブへのスピンポンピング

Fukuzawa, K.*; 加藤 岳生*; 松尾 衛; Jonckheere, T.*; Rech, J.*; Martin, T.*

Fukuzawa, K.*; Kato, Takeo*; Matsuo, Mamoru; Jonckheere, T.*; Rech, J.*; Martin, T.*

We theoretically study spin pumping from a ferromagnetic insulator (FI) into a carbon nanotube (CNT). By employing the bosonization method, we formulate the Gilbert damping induced by the FI/CNT junction, which can be measured by ferromagnetic resonance. We show that the increase in the Gilbert damping has a temperature dependence characteristic of a Luttinger liquid and is highly sensitive to the Luttinger parameter of the spin sector for a clean interface. We also discuss the experimental relevance of our findings based on numerical estimates, using realistic parameters.