RT info:eu-repo/semantics/bachelorThesis
T1 Propiedades magnéticas de átomos de
transición depositados sobre NaCl
A1 Padilla Ruiz, Gabriel
AB Magnetic domains are at the core of most data storage technologies. Material science isfundamental in the design of new devices, with a continuous search for devices with smaller domain sizes, which enables higher storage density, together with new protocols for more efficientmanipulation. The route for new materials and implementation can be more efficiently addressed in a bottom-up approach, where optimal atomic species, crystal structures, and stackingsare analyzed systematically. Thin insulating layers act as stabilizers of the magnetic domains,which suffer the impact of interactions such as phonon scattering, electronic scattering withnearby metals, or the interaction with the probe tunnel current. With this idea in mind, in thiswork, we study the magnetic properties of some transition metal atoms, usually employed inmagnetic domains, deposited on an atomically thin insulating layer of NaCl, a substrate thathas been used by some experimental groups in the search for alternative and viable technologies. With the aid of an electronic multiplet calculation, which allows us to treat preciselythe essential electronic correlations in the d-shell of the transition metal atom, we describethe magnetic degrees of freedom of the local spins of isolated impurities. The analysis of thespectral properties permits us to describe essential properties, such as the magnetic anisotropy,the energy scale responsible of the stabilization of the magnetic moments versus thermal orquantum fluctuations. We first use cobalt as a model adatom, and we use it to explore therobustness and limitations of our results. The analysis of structural and absorption propertiesis beyond the scope of the present work. Thus, it should be understood as a guide for futureand more elaborate studies, concentrating just on the possible adatoms which could displaythe most advantageous magnetic properties. The results are then extended to other transitionmetal atoms such as Fe or Ni.
YR 2021
FD 2021
LK http://riull.ull.es/xmlui/handle/915/25730
UL http://riull.ull.es/xmlui/handle/915/25730
LA es
DS Repositorio institucional de la Universidad de La Laguna
RD 26-nov-2024