The 83rd JSAP Autumn Meeting 2022

Presentation information

Oral presentation

10 Spintronics and Magnetics » 10.2 Fundamental and exploratory device technologies for spin

[22p-A205-1~18] 10.2 Fundamental and exploratory device technologies for spin

Thu. Sep 22, 2022 1:30 PM - 6:30 PM A205 (A205)

Shun Kanai(Tohoku Univ.), Kenji Kasahara(Fukuoka Univ.), Itoh Keita(東北大)

4:00 PM - 4:15 PM

[22p-A205-10] Giant spin-charge interconversion efficiency originated from
the large g-factor in single crystal bismuth(110)

Naoki Fukumoto1, Motomi Aoki1, Yuki Fuseya2, Ryo Ohshima1, Ei Shigematsu1, Teruya Shinjo1, Yuichiro Ando1,3, Syoya Sakamoto4, Masanobu Shiga5, Shinji Miwa4, Masashi Shiraishi1 (1.Kyoto Univ., 2.Univ. of Electro-Communications, 3.PRESTO, JST, 4.ISSP, Univ. Tokyo, 5.Kyushu Univ.)

Keywords:bismuth, spin-orbit torque, g-factor

Despite the large spin-orbit coupling of Bi, the spin-charge interconversion (SCI) efficiency of Bi was still substantially small, which has been an open question. To obtain further understandings of the SCI of Bi, we investigated the SCI efficiency in the Bi(110) whose g-factor has known to be much larger than Bi(111). Large g-factor can realize the high spin polarization efficiently. We conducted the spin torque ferromagnetic resonance (ST-FMR) measurement and the harmonic Hall measurement that are widely used for the SOT evaluation in a variety of materials. Using electron beam deposition, Ar ion milling and a lift-off method, the Bi(110) devices for the ST-FMR and the harmonic Hall measurements were prepared. The second Harmonic signal was fitted by a conventional fitting function considering thermal effects, and the efficiency ξDL of Bi(110) was estimated to be +0.27. Detailed discussion including an origin of the anisotropy in the SCI efficiency of Bi is implemented in the presentation.