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Terahertz Spin-Conductance Spectroscopy: Probing Coherent and Incoherent Ultrafast Spin Tunneling

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Rouzegar,  Reza
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Chekhov,  Alexander       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Bierhance,  Genaro       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Kampfrath,  Tobias       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Rouzegar, R., Wahada, M. A., Chekhov, A., Hoppe, W., Bierhance, G., Jechumtál, J., et al. (2024). Terahertz Spin-Conductance Spectroscopy: Probing Coherent and Incoherent Ultrafast Spin Tunneling. Nano Letters, 24(26), 7852-7860. doi:10.1021/acs.nanolett.4c00498.


Cite as: https://hdl.handle.net/21.11116/0000-000F-7B8C-A
Abstract
Thin-film stacks ℱ|ℋ consisting of a ferromagnetic-metal layer ℱ and a heavy-metal layer ℋ are spintronic model systems. Here, we present a method to measure the ultrabroadband spin conductance across a layer X between ℱ and ℋ at terahertz frequencies, which are the natural frequencies of spin-transport dynamics. We apply our approach to MgO tunneling barriers with thickness d = 0-6 Å. In the time domain, the spin conductance Gs has two components. An instantaneous feature arises from processes like coherent spin tunneling. Remarkably, a longer-lived component is a hallmark of incoherent resonant spin tunneling mediated by MgO defect states, because its relaxation time grows monotonically with d to as much as 270 fs at d = 6.0 Å. Our results are in full agreement with an analytical model. They indicate that terahertz spin-conductance spectroscopy will yield new and relevant insights into ultrafast spin transport in a wide range of spintronic nanostructures.