%0 Journal Article
%A Brinker, Sascha
%A Küster, Felix
%A Parkin, Stuart S. P.
%A Sessi, Paolo
%A Lounis, Samir
%T Anomalous excitations of atomically crafted quantum magnets
%J Science advances
%V 8
%N 4
%@ 2375-2548
%C Washington, DC [u.a.]
%I Assoc.
%M FZJ-2022-03859
%P eabi7291
%D 2022
%X High–energy resolution spectroscopic studies of quantum magnets proved extremely valuable in accessing magnetodynamics quantities, such as energy barriers, magnetic interactions, and lifetime of excited states. Here, we investigate a previously unexplored flavor of low-energy spin excitations for quantum spins coupled to an electron bath. In sharp contrast to the usual tunneling signature of two steps symmetrically centered around the Fermi level, we find a single step in the conductance. Combining time-dependent and many-body perturbation theories, magnetic field–dependent tunneling spectra are explained as the result of an interplay between weak magnetic anisotropy energy, magnetic interactions, and Stoner-like electron-hole excitations that are strongly dependent on the magnetic states of the nanostructures. The results are rationalized in terms of a noncollinear magnetic ground state and the dominance of ferro- and antiferromagnetic interactions. The atomically crafted nanomagnets offer an appealing model for the exploration of electrically pumped spin systems.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 35080983
%U <Go to ISI:>//WOS:000747329300005
%R 10.1126/sciadv.abi7291
%U https://juser.fz-juelich.de/record/910476