Enhancement of Josephson Critical Currents in Ferromagnetic Co40Fe40B20 by Thermal Annealing
Sachio Komori, Juliet E. Thompson, Guang Yang, Graham Kimbell, Nadia Stelmashenko, Mark G. Blamire, Jason W. A. Robinson
DOI 10.1103/PhysRevApplied.17.L021002 · Physical Review Applied
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Abstract
The electrical and structural properties of Co40Fe40B20 (Co−Fe−B) are tunable by thermal annealing. This is key to the optimization of Co−Fe−B-based spintronic devices, where the advantageously low magnetic coercivity, high spin polarization, and controllable magnetocrystalline anisotropy are utilized. Here, we report Nb/Co−Fe−B/Nb Josephson devices and demonstrate an enhancement of the critical current by up to 700% following thermal annealing due to increased structural ordering of the Co−Fe−B. The results demonstrate that Co−Fe−B is a promising material for superconducting quantum spintronic devices.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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