The electrical and structural properties of ${\mathrm{Co}}_{40}{\mathrm{Fe}}_{40}{\mathrm{B}}_{20}$ ($\mathrm{Co}\text{−}\mathrm{Fe}\text{−}\mathrm{B}$) are tunable by thermal annealing. This is key to the optimization of $\mathrm{Co}\text{−}\mathrm{Fe}\text{−}\mathrm{B}$-based spintronic devices, where the advantageously low magnetic coercivity, high spin polarization, and controllable magnetocrystalline anisotropy are utilized. Here, we report $\mathrm{Nb}/\mathrm{Co}\text{−}\mathrm{Fe}\text{−}\mathrm{B}/\mathrm{Nb}$ Josephson devices and demonstrate an enhancement of the critical current by up to 700% following thermal annealing due to increased structural ordering of the $\mathrm{Co}\text{−}\mathrm{Fe}\text{−}\mathrm{B}$. The results demonstrate that $\mathrm{Co}\text{−}\mathrm{Fe}\text{−}\mathrm{B}$ is a promising material for superconducting quantum spintronic devices.

Close

PrevNext

View figure in article

• Ferromagnetism
• Josephson effect
• Proximity effect
• Spintronics