Accessing Ultrafast Spin-Transport Dynamics in Copper Using Broadband Terahertz Spectroscopy

Jechumtál, Jiří; Rouzegar, Reza; Gueckstock, Oliver; Denker, Christian; Hoppe, Wolfgang; Remy, Quentin; Seifert, Tom S.; Kubaščík, Peter; Woltersdorf, Georg; Brouwer, Piet W.; Münzenberg, Markus; Kampfrath, Tobias; Nádvorník, Lukáš

doi:10.1103/physrevlett.132.226703

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2024

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“…Such shifts are typically <10 fs here and irrelevant, because we do not focus on possible d -dependent signal delays. 24 …”

Section: Methodsmentioning

confidence: 99%

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

Rouzegar,

Wahada,

Chekhov

et al. 2024

Nano Lett.

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Thin-film stacks | consisting of a ferromagnetic-metal layer and a heavymetal layer are spintronic model systems. Here, we present a method to measure the ultrabroadband spin conductance across a layer between and 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 G s 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.

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“…Such shifts are typically <10 fs here and irrelevant, because we do not focus on possible d -dependent signal delays. 24 …”

Section: Methodsmentioning

confidence: 99%

“…The origin of the t axis may vary from sample to sample due, e.g., to variations of substrate thickness. Such shifts are typically <10 fs here and irrelevant, because we do not focus on possible d -dependent signal delays …”

Section: Methodsmentioning

confidence: 99%