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Spin-to-charge conversion with various quantum materials

Date : Monday, May 22nd, 2023 14:00 - 15:00 Place : Seminar Room 5 (A615), 6th Floor, ISSP Lecturer : Subhankar Bedanta Affiliation : National Institute of Science Education and Research (NISER) Committee Chair : UWATOKO Yoshiya (63330)
e-mail: yuwatoko@g.ecc.u-tokyo.ac.jp
Language in Speech : English

The precession of magnetization in a ferromagnet (FM) can transmit pure spin current into an adjacent heavy metal (HM) via spin pumping. This pure spin current gets converted to charge current due to high spin orbit coupling (SOC) of the HM due to the inverse spin Hall effect (ISHE). I will discuss recent ISHE results on Co2Fe0.4Mn0.6Si/Pt bilayers, where Co2Fe0.4Mn0.6Si is a full Heusler alloy. Damping analysis indicates the presence of significant spin pumping at the interface of Co2Fe0.4Mn0.6Si and Pt [1]. I will also discuss ISHE experiments on some other combinations such as CoFeB/IrO2 and manganite based La0.66Sr0.34MnO3/Pt bilayers. [2-3] Recently AFM materials having high SOC have been found to be a good replacement of HM in spin current based study. We have performed the ISHE study of CoFeB (10 nm)/ AFM (d nm) where we considered various AFM such as Mn2Au, IrMn, Mn3Ga etc. The systematic angle dependent ISHE measurements have been carried out to disentangle the different spin rectification effects viz. anisotropic magnetoresistance and anomalous Hall effect [4 – 6]. Further I will show the ISHE study on topological insulator (TI)/ferromagnetic Bi2Se3/CoFeB films [7,8]. ISHE experiments have also been performed to demonstrate that TIs are potential candidates to replace HM as they possess high spin-orbit coupling.

Acknowledgements: I like to thank my collaborators and funding agencies for their generous support.

[1] B. B. Singh et al., NPG Asia Materials, 13, 9 (2021)
[2] B. Sahoo et al. Adv. Quant. Technol. 2021, 2000146 (2021)
[3] P. Gupta et al., Nanoscale, 13, 2714-2719, (2021)
[4] B. B. Singh and S. Bedanta, Phys. Rev. Applied 13, 044020 (2020).
[5] B. B. Singh et al., Phys. Rev. B 102, 174444 (2020)
[6] K. Roy et al., J. Phys. D – Appl. Phys. 54, 425001 (2021)
[7] B. B. Singh et al., PSS Rapid 2018, 1800492 (2018)
[8] B. B. Singh et al., ACS Applied Material & Interfaces 12, 53409 (2020)

(Published on: Wednesday May 17th, 2023)