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Superconducting spin valve effect in Co/Pb/Co heterostructures with insulating interlayers
Andrey A Kamashev1, Nadir N Garif'yanov1, Aidar A Validov1
1Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029 Kazan, Russia.
Beilstein Journal of Nanotechnology
|May 7, 2024
Summary
Researchers observed a significant spin valve effect in cobalt/lead/cobalt heterostructures, even with oxidized interfaces. Switching magnetization states shifted the superconducting transition temperature (Tc) by 0.2 K, challenging previous assumptions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Superconductor/ferromagnet (S/F) proximity effects are crucial for spintronic devices.
- The spin valve effect, modulating critical temperature (Tc) based on magnetization alignment, is typically optimized with clean interfaces.
Purpose of the Study:
- To investigate the superconducting properties of Co/Pb/Co heterostructures with intentionally oxidized S/F interfaces.
- To determine if a significant spin valve effect can be achieved despite non-ideal interfaces.
Main Methods:
- Fabrication of Co/Pb/Co heterostructures with controlled insulating interlayers.
- Measurement of superconducting critical temperature (Tc) as a function of the relative magnetization orientation of the Co layers.
Main Results:
- A notable spin valve effect was observed, with a shift in Tc of up to 0.2 K.
- This effect occurred despite the intentional oxidation of the S/F interfaces, contrary to common expectations.
- The results confirm earlier findings on oxidized interlayers in F1/S/F2 systems.
Conclusions:
- Intentionally deteriorated interfaces do not preclude a significant spin valve effect in S/F heterostructures.
- Oxidized interlayers offer a viable alternative for optimizing superconducting spin valve performance.
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