We show that it is possible to tune the N\'eel temperature of nickel(II)-cobalt(II) oxide films by changing the Ni to Co ratio. We grow single crystalline micrometric triangular islands with tens of nanometers thickness on a Ru(0001) substrate using high temperature oxygen-assisted molecular beam epitaxy. Composition is controlled by adjusting the deposition rates of Co and Ni. The morphology, shape, crystal structure and composition are determined by low-energy electron microscopy and diffraction, and synchrotron-based x-ray absorption spectromicroscopy. The antiferromagnetic order is observed by x-ray magnetic linear dichroism. Antiferromagnetic domains up to micrometer width are observed.
@article{arxiv.2309.13721,
title = {Tuning the N\'eel temperature in an antiferromagnet: the case of NixCo1-xO microstructures},
author = {Anna Mandziak and Guiomar D. Soria and José Emilio Prieto and Pilar Prieto and Cecilia Granados-Miralles and Adrian Quesada and Michael Foerster and Lucia Aballe and Juan de la Figuera},
journal= {arXiv preprint arXiv:2309.13721},
year = {2023}
}