TY  - JOUR
AU  - Brinker, Sascha
AU  - Küster, Felix
AU  - Parkin, Stuart S. P.
AU  - Sessi, Paolo
AU  - Lounis, Samir
TI  - Anomalous excitations of atomically crafted quantum magnets
JO  - Science advances
VL  - 8
IS  - 4
SN  - 2375-2548
CY  - Washington, DC [u.a.]
PB  - Assoc.
M1  - FZJ-2022-03859
SP  - eabi7291
PY  - 2022
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 35080983
UR  - <Go to ISI:>//WOS:000747329300005
DO  - DOI:10.1126/sciadv.abi7291
UR  - https://juser.fz-juelich.de/record/910476
ER  -