Confining single Er3+ ions in sub-3 nm NaYF4 nanoparticles to induce slow relaxation of the magnetisation

作者：Diogo A. Gálico, Emille M. Rodrigues, Ilias Halimi, Juho Toivola, He Zhao, Jiahui Xu, Jani O. Moilanen, Xiaogang Liu, Eva Hemmer, Muralee Murugesu · 发表于：Nature Communications · 年份：2024 · DOI：10.1038/s41467-024-47682-x · 被引用次数：13 · 研究领域：Magnetism in coordination complexes、Lanthanide and Transition Metal Complexes、Advanced NMR Techniques and Applications

Abstract Molecular systems known as single-molecule magnets (SMMs) exhibit magnet-like behaviour of slow relaxation of the magnetisation and magnetic hysteresis and have potential application in high-density memory storage or quantum computing. Often, their intrinsic magnetic properties are plagued by low-energy molecular vibrations that lead to phonon-induced relaxation processes, however, there is no straightforward synthetic approach for molecular systems that would lead to a small amount of low-energy vibrations and low phonon density of states at the spin-resonance energies. In this work, we apply knowledge accumulated over the last decade in molecular magnetism to nanoparticles, incorporating Er 3+ ions in an ultrasmall sub-3 nm diamagnetic NaYF 4 nanoparticle (NP) and probing the slow relaxation dynamics intrinsic to the Er 3+ ion. Furthermore, by increasing the doping concentration, we also investigate the role of intraparticle interactions within the NP. The knowledge gained from this study is anticipated to enable better design of magnetically high-performance molecular and bulk magnets for a wide variety of applications, such as molecular electronics.