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Multilevel Resistance Switching and Enhanced Spin Transition Temperature in Single- And Double-Molecule Spin Crossover Nanogap Devices

Gee, Alex; Jaafar, Ayoub H; Jaafar, Ayoub H.; Brachňaková, Barbora; Massey, Jamie; Marrows, Christopher H; Marrows, Christopher H.; Šalitroš, Ivan; Kemp, N. T.


Alex Gee

Ayoub H Jaafar

Ayoub H. Jaafar

Barbora Brachňaková

Jamie Massey

Christopher H Marrows

Christopher H. Marrows

Ivan Šalitroš

N. T. Kemp


Neil Kemp


Spin crossover (SCO) molecules are promising bistable magnetic switches with applications in molecular spintronics. However, little is known about the switching effects of a single SCO molecule when it is confined between two metal electrodes. Here, we examine the switching properties of a [Fe(III)(EtOSalPet)(NCS)] SCO molecule that is specifically tailored for surface deposition and binding to only one gold electrode in a nanogap device. Temperature-dependent conductivity measurements on an SCO molecule containing electromigrated gold break junctions show voltage-independent telegraphic-like switching between two resistance states at a temperature below 200 K. The transition temperature is very different from the transition temperature of 83 K that occurs in a bulk film of the same material. This indicates that the bulk, cooperative SCO phenomenon is no longer preserved for a single molecule and that the surface interaction drastically increases the temperature of the SCO phenomenon. Another key finding of this work is that some devices show switching between multiple resistance levels. We propose that in this case, two SCO molecules are present within the nanogap, with both participating in the electronic transport and switching.


Gee, A., Jaafar, A. H., Jaafar, A. H., Brachňaková, B., Massey, J., Marrows, C. H., …Kemp, N. T. (2020). Multilevel Resistance Switching and Enhanced Spin Transition Temperature in Single- And Double-Molecule Spin Crossover Nanogap Devices. Journal of physical chemistry. C, 124(24), 13393-13399.

Journal Article Type Article
Acceptance Date May 30, 2020
Online Publication Date May 30, 2020
Publication Date Jun 18, 2020
Deposit Date Feb 9, 2021
Publicly Available Date May 31, 2021
Journal Journal of Physical Chemistry C
Print ISSN 1932-7447
Electronic ISSN 1932-7455
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 124
Issue 24
Pages 13393-13399
Keywords Gold; Molecules; Electrodes; Quantum mechanics; Nanogaps
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Copyright Statement
© 2020 American Chemical Society. This is an author produced version of a journal article published in The Journal of Physical Chemistry C. Uploaded in accordance with the publisher's self-archiving policy.

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