Temperature-Dependent Spin Transport and Current-Induced Torques in Superconductor-Ferromagnet Heterostructures

Müller, Manuel; Liensberger, Lukas; Flacke, Luis; Huebl, Hans; Kamra, Akashdeep; Belzig, Wolfgang; Gross, Rudolf; Weiler, Mathias; Althammer, Matthias

doi:10.1103/physrevlett.126.087201

Cited by 27 publications

(17 citation statements)

References 81 publications

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“…To date, there is no experimental evidence of supercurrent-induced torques. In a recent work, 109 current-induced torques were characterised in superconductor-ferromagnet heterostructures, but no evidence of supercurrent-induced SOTs emerged from the study. This could be due to the absence of a triplet condensate due to the thickness of the superconducting layer exceeding the Cooper pairs correlation length.…”

Section: Challenges and Prospects Of Superconducting Spintronicsmentioning

confidence: 97%

Boosting spintronics with superconductivity

2021

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Spintronics aims to utilize the spin degree of freedom for energy-efficient, non-volatile memory and logic devices. In this research update, we review state-of-the-art developments and new directions in charge-and spin-based memory/logic with a focus on spintronics and the fascinating potential for superconductivity to boost spin transmission via spin-polarized quasiparticles or triplet Cooper pairs.

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Section: Challenges and Prospects Of Superconducting Spintronicsmentioning

confidence: 97%

Boosting spintronics with superconductivity

2021

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“…Having understood the key ingredients and qualitative dependencies, the experiments can engineer new hybrids capable of robust critical current control via gate voltage and/or magnetic order orientation. Further, important insights can be achieved using recently established methods for measuring interfacial spin-orbit torques [77].…”

Section: Discussion and Outlookmentioning

confidence: 99%

Interfacial control of vortex-limited critical current in type II superconductor films

Hope,

Amundsen,

Suri

et al. 2021

Preprint

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In a class of type II superconductor films, the critical current is determined by the Bean-Livingston barrier posed by the film surfaces to vortex penetration into the sample. A bulk property thus depends sensitively on the surface or interface to an adjacent material. We theoretically investigate the dependence of vortex barrier and critical current in such films on the Rashba spin-orbit coupling at their interfaces with adjacent materials. Considering an interface with a magnetic insulator, we find the spontaneous supercurrent resulting from the Zeeman field and interfacial spin-orbit coupling to substantially modify the vortex surface barrier. Thus, we show that the critical currents in superconductor-magnet heterostructures can be controlled, and even enhanced, via the interfacial spin-orbit coupling. Since the latter can be controlled via a gate voltage, our analysis predicts a class of heterostructures amenable to gate-voltage modulation of superconducting critical currents. It also sheds light on the recently observed gate-voltage enhancement of critical current in NbN superconducting films.

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“…These reports mainly focus on the electrical properties of the FM zero-and -junctions. Recently, dynamic spin injection into SCs has attracted considerable interest both the experimentally (18)(19)(20)(21) and theoretically (22)(23)(24)(25)(26). However, the spin-dependent properties in FM zero-and -junctions have not been explored yet.…”

Section: Introductionmentioning

confidence: 99%

Giant oscillatory Gilbert damping in superconductor/ferromagnet/superconductor junctions

Yao

Cai

et al. 2021

Sci. Adv.

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Interfaces between materials with differently ordered phases present unique opportunities for exotic physical properties, especially the interplay between ferromagnetism and superconductivity in the ferromagnet/ superconductor heterostructures. The investigation of zero-and -junctions has been of particular interest for both fundamental physical science and emerging technologies. Here, we report the experimental observation of giant oscillatory Gilbert damping in the superconducting niobium/nickel-iron/niobium junctions with respect to the nickel-iron thickness. This observation suggests an unconventional spin pumping and relaxation via zeroenergy Andreev bound states that exist not only in the niobium/nickel-iron/niobium -junctions but also in the niobium/nickel-iron/niobium zero-junctions. Our findings could be important for further exploring the exotic physical properties of ferromagnet/superconductor heterostructures and potential applications of ferromagnet -junctions in quantum computing, such as half-quantum flux qubits.

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Temperature-Dependent Spin Transport and Current-Induced Torques in Superconductor-Ferromagnet Heterostructures

Cited by 27 publications

References 81 publications

Boosting spintronics with superconductivity

Boosting spintronics with superconductivity

Interfacial control of vortex-limited critical current in type II superconductor films

Giant oscillatory Gilbert damping in superconductor/ferromagnet/superconductor junctions

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