Pt and CoB trilayer Josephson [Formula: see text] junctions with perpendicular magnetic anisotropy.
2021
We report on the electrical transport properties of Nb based Josephson junctions with Pt/Co
$$_{68}$$
B
$$_{32}$$
/Pt ferromagnetic barriers. The barriers exhibit perpendicular magnetic anisotropy, which has the main advantage for potential applications over magnetisation in-plane systems of not affecting the Fraunhofer response of the junction. In addition, we report that there is no magnetic dead layer at the Pt/Co
$$_{68}$$
B
$$_{32}$$
interfaces, allowing us to study barriers with ultra-thin Co
$$_{68}$$
B
$$_{32}$$
. In the junctions, we observe that the magnitude of the critical current oscillates with increasing thickness of the Co
$$_{68}$$
B
$$_{32}$$
strong ferromagnetic alloy layer. The oscillations are attributed to the ground state phase difference across the junctions being modified from zero to $$\pi $$
. The multiple oscillations in the thickness range $$0.2~\leqslant ~d_\text {CoB}~\leqslant ~1.4$$
nm suggests that we have access to the first zero-
$$\pi $$
and $$\pi $$
-zero phase transitions. Our results fuel the development of low-temperature memory devices based on ferromagnetic Josephson junctions.
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