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Dipolar ordering in a molecular nanomagnet detected using muon spin relaxation

Pratt, F.L.; Micotti, E.; Carretta, P.; Lascialfari, A.; Arosio, P.; Lancaster, T.; Blundell, S.J.; Powell, A.K.

Dipolar ordering in a molecular nanomagnet detected using muon spin relaxation Thumbnail


Authors

F.L. Pratt

E. Micotti

P. Carretta

A. Lascialfari

P. Arosio

S.J. Blundell

A.K. Powell



Abstract

Implanted muons have been used as a local probe to detect the magnetic ordering in the molecular magnetic nanodisk system Fe 19 . Two distinct groups of muon sites are identified from the relaxation data, reflecting sites near the magnetic core and sites distributed over the rest of the molecule. Dipole field calculations and Monte Carlo simulations confirm that the observed transition in Fe 19 is consistent with magnetic ordering driven by interactions between molecules that are predominantly dipolar in nature. The triclinic crystal structure of this system gives the dipolar field a significant component transverse to the easy spin axis and the parallel component provides a dipolar bias closely tuned to the first level crossing of the system. These factors enhance the quantum tunneling between levels, thus enabling the system to avoid spin freezing at low temperatures and efficiently reach the dipolar ordered state.

Citation

Pratt, F., Micotti, E., Carretta, P., Lascialfari, A., Arosio, P., Lancaster, T., …Powell, A. (2014). Dipolar ordering in a molecular nanomagnet detected using muon spin relaxation. Physical review B, 89(14), Article 144420. https://doi.org/10.1103/physrevb.89.144420

Journal Article Type Article
Acceptance Date Mar 14, 2014
Online Publication Date Apr 21, 2014
Publication Date Apr 21, 2014
Deposit Date May 2, 2014
Publicly Available Date Mar 28, 2024
Journal Physical Review B
Print ISSN 1098-0121
Electronic ISSN 1550-235X
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 89
Issue 14
Article Number 144420
DOI https://doi.org/10.1103/physrevb.89.144420

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Copyright Statement
Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.





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