Pt and CoB trilayer Josephson $$\pi $$ junctions with perpendicular magnetic anisotropy

We report on the electrical transport properties of Nb based Josephson junctions with Pt/Co$$_{68}$$ 68 B$$_{32}$$ 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$$_{68}$$ 68 B$$_{32}$$ 32 interfaces, allowing us to study barriers with ultra-thin Co$$_{68}$$ 68 B$$_{32}$$ 32 . In the junctions, we observe that the magnitude of the critical current oscillates with increasing thickness of the Co$$_{68}$$ 68 B$$_{32}$$ 32 strong ferromagnetic alloy layer. The oscillations are attributed to the ground state phase difference across the junctions being modified from zero to $$\pi $$ π . The multiple oscillations in the thickness range $$0.2~\leqslant ~d_\text {CoB}~\leqslant ~1.4$$ 0.2 ⩽ d CoB ⩽ 1.4 nm suggests that we have access to the first zero-$$\pi $$ π and $$\pi $$ π -zero phase transitions. Our results fuel the development of low-temperature memory devices based on ferromagnetic Josephson junctions.

Ferromagnetic alloy for high-efficiency photovoltaic conversion in solar cells: first-principles insights when doping SnO2 rutile with coupled Eu–Gd

A material design of half-metallic ferromagnetic semiconductors based on (Eu, Gd)-doped SnO2 rutile is proposed for High-Efficiency Photovoltaic Conversion in solar cells.

Rare-earth-doped TiO2 rutile as a promising ferromagnetic alloy for visible light absorption in solar cells: first principle insights

The electronic structure and magneto-optic properties of TiO2 (rutile) doped with rare-earth elements are explored using a first-principles all-electron full-potential augmented spherical-wave method, to examine their potential use as a spintronic and optoelectronic system.