Simultaneous High Charge‐Spin Conversion Efficiency and Large Spin Diffusion Length in Altermagnetic RuO2

Author:

Zhang Yichi1,Bai Hua1,Han Lei1,Chen Chong1,Zhou Yongjian1,Back Christian H.23,Pan Feng1,Wang Yuyan4,Song Cheng1ORCID

Affiliation:

1. Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 P. R. China

2. Department of Physics Technical University of Munich 85748 Garching Germany

3. Center for Quantum Engineering (ZQE) Technical University Munich 85748 Garching Germany

4. Beijing National Research Center for Information Science and Technology Tsinghua University Beijing 100084 P. R. China

Abstract

AbstractEfficient spin sources with large spin Hall angle (θSH) and long spin diffusion length (λSD) are highly desired in the application of spintronic devices. However, due to strong spin‐orbit coupling, the two targets can hardly be achieved simultaneously in conventional relativistic spin sources, like heavy metals. Here, it is proven that collinear antiferromagnetic RuO2 films are able to address this key issue and break the inverse relationship of θSH versus λSD. Based on spin torque‐ferromagnetic resonance and spin pumping measurements, the authors demonstrate that the θSH of RuO2(100) films is 0.183, and the λSD is over 12 nm being an order of magnitude longer than that of Pt, β‐W, and β‐Ta. Meanwhile, sizable λSD is also obtained in spin current with out‐of‐plane spin polarization generated by RuO2(101) films. By conducting a control experiment, the nonrelativistic altermagnetic spin splitting effect (ASSE) is ascertained to be the crucial mechanism accounting for the simultaneous large θSH and long λSD in RuO2. Besides the fundamental significance, these findings will advance the development of spintronics towards higher efficiency and lower power consumption.

Funder

National Basic Research Program of China

National Natural Science Foundation of China

Publisher

Wiley

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