"Work partially supported by the Ministerio de Economía y Competitividad (MINECO) projects MAT2015–65356–C3–3–R and FIS2015–67367 C2–1–P, the Ministerio de Ciencia, Innovación y Universidades projects PGC2018–093291–B–I00, PGC2018-097028–A–I00, PGC2018-098613–B–C21 and PID2019-109525RB-I00 and the Comunidad de Madrid (CM) projects Nanomag COST-CM,P2018/NMAT-4321 and NMAT2D-CM P2018/NMT-4511. We acknowledge financial support from the Spanish Ministry of Science and Innovation, through project PID2019–109525RB–I00 and the "María de Maeztu" Programme for Units of Excellence in R&D (CEX2018–000805–M). IMDEA Nanociencia acknowledges support from the ’Severo Ochoa’ Programme for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686). M.G. has received financial support through the Postdoctoral Junior Leader Fellowship Programme from "la Caixa” Banking Foundation."