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Ultrafast THz probing of nonlocal orbital current in transverse multilayer metallic heterostructures

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  • Sandeep Kumar

    (Indian Institute of Technology Delhi)

  • Sunil Kumar

    (Indian Institute of Technology Delhi)

Abstract

THz generation from femtosecond photoexcited spintronic heterostructures has become a versatile tool for investigating ultrafast spin-transport and transient charge-current in a non-contact and non-invasive manner. The equivalent effect from the orbital degree of freedom is still in the primitive stage. Here, we experimentally demonstrate orbital-to-charge current conversion in metallic heterostructures, consisting of a ferromagnetic layer adjacent to either a light or a heavy metal layer, through detection of the emitted THz pulses. Our temperature-dependent experiments help to disentangle the orbital and spin components that are manifested in the respective Hall-conductivities, contributing to THz emission. NiFe/Nb shows the strongest inverse orbital Hall effect with an experimentally extracted value of effective intrinsic Hall-conductivity, $${({\sigma }_{{SOH}}^{{{{{\mathrm{int}}}}}})}^{{eff}} \sim 195{\varOmega }^{-1}{{cm}}^{-1}$$ ( σ S O H int ) e f f ~ 195 Ω − 1 c m − 1 , while CoFeB/Pt shows maximum contribution from the inverse spin Hall effect. In addition, we observe a nearly ten-fold enhancement in the THz emission due to pronounced orbital-transport in W-insertion heavy metal layer in CoFeB/W/Ta heterostructure as compared to CoFeB/Ta bilayer counterpart.

Suggested Citation

  • Sandeep Kumar & Sunil Kumar, 2023. "Ultrafast THz probing of nonlocal orbital current in transverse multilayer metallic heterostructures," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43956-y
    DOI: 10.1038/s41467-023-43956-y
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    References listed on IDEAS

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    1. Dongjoon Lee & Dongwook Go & Hyeon-Jong Park & Wonmin Jeong & Hye-Won Ko & Deokhyun Yun & Daegeun Jo & Soogil Lee & Gyungchoon Go & Jung Hyun Oh & Kab-Jin Kim & Byong-Guk Park & Byoung-Chul Min & Hyun, 2021. "Orbital torque in magnetic bilayers," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    2. C. Boeglin & E. Beaurepaire & V. Halté & V. López-Flores & C. Stamm & N. Pontius & H. A. Dürr & J.-Y. Bigot, 2010. "Distinguishing the ultrafast dynamics of spin and orbital moments in solids," Nature, Nature, vol. 465(7297), pages 458-461, May.
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    Cited by:

    1. Sobhan Subhra Mishra & James Lourembam & Dennis Jing Xiong Lin & Ranjan Singh, 2024. "Active ballistic orbital transport in Ni/Pt heterostructure," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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