Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00198 : Spin transport in Ni81Fe19/AlOx/SrTiO3 heterostructure*
Presenter:
Nozomi Soya
(Keio University)
Authors:
Nozomi Soya
(Keio University)
Takayoshi Katase
(Tokyo Institute of Technology)
Kazuya Ando
(Keio University)
Here, we demonstrate the charge-to-spin conversion by the direct EE in a 2DEG at an AlOx/SrTiO3 interface. We conduct the spin torque ferromagnetic resonance measurements on Ni81Fe19 (4.2 nm)/AlOx (2 nm)/SrTiO3 devices, where a spin current generated by the direct EE in the 2DEG is injected into the Ni81Fe19 through the AlOx and exerts a spin torque on the local magnetization of the Ni81Fe19. The effective charge-to-spin conversion efficiency of the 2DEG exceeds 10% at room temperature, which is comparable to that of the archetypal spin-to-charge converter, Pt. The effective charge-to-spin conversion efficiency is found to be suppressed by decreasing temperature. From the analysis regarding to the carrier density and band structure of the 2DEG, we confirm that the spin density generated by the EE does not decrease with decreasing temperature. Therefore, the decrease of the effective charge-to-spin conversion efficiency is ascribed to the decrease of the spin transmission. We demonstrate a crossover of the dominant spin transport mechanism from the inelastic tunneling to elastic tunneling induced by decreasing temperature.
*This work was supported by JST FOREST Program (Grant Number JPMJFR2032), JSPS KAKENHI (Grant Numbers 19H00864, 20H00337, 20H02593, 22H04964), Asahi Glass Foundation, and Spintronics Research Network of Japan (Spin-RNJ). N.S. was supported by JSPS Grant-in-Aid for Research Fellowship for Young Scientists (DC1)(Grant Number 22J21317).
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