Exchange coupling in a frustrated trimetric molecular magnet reversed by a 1D nano-confinement

Author(s)
Oleg Domanov, Eugen Weschke, Takeshi Saito, Herwig Peterlik, Thomas Pichler, Michael Eisterer, Hidetsugu Shiozawa
Abstract

Single-molecule magnets exhibit magnetic ordering due to exchange coupling between localized spin components that makes them primary candidates as nanometric spintronic elements. Here we manipulate exchange interactions within a single-molecule magnet by nanometric structural confinement, exemplified with single-wall carbon nanotubes that encapsulate trimetric nickel(II) acetylacetonate hosting three frustrated spins. It is revealed from bulk and Ni 3d orbital magnetic susceptibility measurements that the carbon tubular confinement allows a unique one-dimensional arrangement of the trimer in which the nearest-neighbour exchange is reversed from ferromagnetic to antiferromagnetic, resulting in quenched frustration as well as the Pauli paramagnetism is enhanced. The exchange reversal and enhanced spin delocalisation demonstrate the means of mechanically and electrically manipulating molecular magnetism at the nanoscale for nano-mechatronics and spintronics.

Organisation(s)
Electronic Properties of Materials, Dynamics of Condensed Systems, Faculty Center for Nano Structure Research
External organisation(s)
Helmholtz-Zentrum Berlin für Materialien und Energie, National Institute of Advanced Industrial Science and Technology (AIST), Technische Universität Wien, Czech Academy of Sciences
Journal
Nanoscale
Volume
11
Pages
10615-10621
No. of pages
7
ISSN
2040-3364
DOI
https://doi.org/10.1039/c9nr00796b
Publication date
06-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
Condensed matter, Materials physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/exchange-coupling-in-a-frustrated-trimetric-molecular-magnet-reversed-by-a-1d-nanoconfinement(a647cb6b-d965-43c6-8d25-66c4033cceb0).html