Semiconductor - Ferromagnetic Insulator - Superconductor Nanowires: Stray Field and Exchange Field

Abstract

Nanowires can serve as flexible substrates for hybrid epitaxial growth on selected facets, allowing for design of heterostructures with complex material combinations and geometries. In this work we report on hybrid epitaxy of semiconductor - ferromagnetic insulator - superconductor (InAs/EuS/Al) nanowire heterostructures. We study the crystal growth and complex epitaxial matching of wurtzite InAs / rock-salt EuS interfaces as well as rock-salt EuS / face-centered cubic Al interfaces. Because of the magnetic anisotropy originating from the nanowire shape, the magnetic structure of the EuS phase are easily tuned into single magnetic domains. This effect efficiently ejects the stray field lines along the nanowires. With tunnel spectroscopy measurements of the density of states, we show the material has a hard induced superconducting gap, and magnetic hysteretic evolution which indicates that the magnetic exchange fields are not negligible. These hybrid nanowires fulfil key material requirements for serving as a platform for spin-based quantum applications, such as scalable topological quantum computing.

15 pages, 5 figures

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Cited by in corpus (49)

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• Majorana nanowires for topological quantum computation
• Superconducting phenomena in systems with unconventional magnets
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• Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors
• Dependence of the electronic structure of the EuS/InAs interface on the bonding configuration
• Non-Hermitian skin effect induced by Rashba-Dresselhaus spin-orbit coupling
• Bulk Bogoliubov Fermi arcs in non-Hermitian superconducting systems
• Topological superconductivity in tripartite superconductor-ferromagnet-semiconductor nanowires
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• Dissipationless Nonlinearity in Quantum Material Josephson Diodes
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• Majorana Zero Modes in Ferromagnetic Wires without Spin-Orbit Coupling
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• Renormalized and iterative formalism of the Andreev levels within large multi-parametric space
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