AFM-Based Spin-Exchange Microscopy Using Chiral Molecules.
atomic force microscopy
chiral molecules
magnetic imaging
spin exchange
Journal
Advanced materials (Deerfield Beach, Fla.)
ISSN: 1521-4095
Titre abrégé: Adv Mater
Pays: Germany
ID NLM: 9885358
Informations de publication
Date de publication:
Oct 2019
Oct 2019
Historique:
received:
02
07
2019
revised:
06
08
2019
pubmed:
20
8
2019
medline:
20
8
2019
entrez:
20
8
2019
Statut:
ppublish
Résumé
Local magnetic imaging at nanoscale resolution is desirable for basic studies of magnetic materials and for magnetic logic and memories. However, such local imaging is hard to achieve by means of standard magnetic force microscopy. Other techniques require low temperatures, high vacuum, or strict limitations on the sample conditions. A simple and robust method is presented for locally resolved magnetic imaging based on short-range spin-exchange interactions that can be scaled down to atomic resolution. The presented method requires a conventional AFM tip functionalized with a chiral molecule. In proximity to the measured magnetic sample, charge redistribution in the chiral molecule leads to a transient spin state, caused by the chiral-induced spin-selectivity effect, followed by the exchange interaction with the imaged sample. While magnetic force microscopy imaging strongly depends on a large working distance, an accurate image is achieved using the molecular tip in proximity to the sample. The chiral molecules' spin-exchange interaction is found to be 150 meV. Using the tip with the adsorbed chiral molecules, two oppositely magnetized samples are characterized, and a magnetic imaging is performed. This method is simple to perform at room temperature and does not require high-vacuum conditions.
Identifiants
pubmed: 31423697
doi: 10.1002/adma.201904206
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e1904206Subventions
Organisme : Volkswagen Foundation
ID : VW 88 367
Organisme : Israel Science Foundation
ID : 1248/10
Organisme : John Templeton Foundation
ID : 60796
Informations de copyright
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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