Prof. Nobuki Tezuka Profile

Prof. Nobuki Tezuka

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Proceedings Article | 20 August 2020 Presentation

Anomalous spin-orbit field via the Rashba-Edelstein effect at the W/Pt interface

Shutaro Karube, Nobuki Tezuka, Makoto Kohda, Junsaku Nitta

Proceedings Volume 11470, 114701H (2020) https://doi.org/10.1117/12.2568291

KEYWORDS: Interfaces, Metals, Spintronics, Physics, Dielectrics, Diffusion, Lead

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Spin-orbit (SO) field generated via spin Hall effect (SHE) or Rashba-Edelstein effect (REE) is one of the most important topics in spintronics for both fundamental physics and practical applications. Therefore a lot of SO materials such as heavy metals or topological insulators have been intensively studied so far for high conversion efficiency or functionality. But the SO torque efficiency is a material specific value in any case. It is ideal for us to synthesize the SO materials which have variable efficiency on our purposes. Here using a combination of heavy metals (HMs), we demonstrate to create extra SO fields such as damping-like (DL) and field-like (FL) fields on a Ni₈₀Fe₂₀(Py) layer via the REE at a W/Pt interface away from the Py layer through spin diffusion in the heavy metal layer. This means that we can manipulate the effective SO fields via the interface generated by a combination of materials apart from SHE contribution, and synthesize a designable SO material. Moreover we found opposite sign of the extra FL field in an inverse stacking structure like Py/Pt/W compared with in the Py/W/Pt. This implies that the extra field is coming from the HMs interface which has Rashba effect due to the change of the effective field direction at the interfaces. This leads us to a new concept of “synthetic SO materials” which paves a way for seeking high efficiency or superior functionalities in SO torque.

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