[14a-A501-1~13] 10.2 Fundamental and exploratory device technologies for spin

△ [14a-A501-6] Evaluation of spin diffusion length in ambipolar conductor YH₂

〇(M1)Hayate Kawaguchi¹, Yugo Ashizawa¹, Yutaro Takahashi¹, Ikuo Yamazaki¹, Mst. Sanjida Aktar¹, Masamichi Sakai¹, Toshihiro Yoshizumi¹, Tatsuro Hanajiri², Masahide Tokuda², Yasuhiko Fujii², Osamu Nakamura³, Pham Van Thach⁴, Hiroyuki Awano⁴, Shigehiko Hasegawa⁵ (1.Saitama Univ., 2.Toyo Univ., 3.Okayama Univ. of Sci., 4.Toyota Technol. Inst., 5.ISIR Osaka Univ.)

Keywords:spin diffusion length, spin current, spin injection

We fabricated a Hall-bar structure using a ferrimagnetic GdFeCo(Gd:Fe:Co=25:66:9) for the spin-polarized current injection terminal and a non-magnetic metal Au for the counter electrode, and confirmed the spin injection into ambipolar conductor YH₂ by measuring the Hall effect. By measuring the Hall resistance at three different distances, it was estimated that the spin diffusion length of YH₂ was about 43 μm. This supports the theoretical prediction that spin injection length increases inversely with charge polarization when electron spin and hole spin are injected into ambipolar conductor.