Inducing ferromagnetic behaviour in Cu nanoparticles and thin films via non-stoichiometric oxidation

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Authors
  1. Marenco, A.J.
  2. Pedersen, D.B.
  3. Trudel, S.
Corporate Authors
Defence Research and Development Canada, Centre for Security Science, Ottawa ON (CAN)
Abstract
The unconventional magnetism of Cu nanomaterials has been studied in highlypure and surface-free nanoparticles and thin films. Gas-phase synthesis of these materials allows to study the size and surface effects independently and their capacity on inducing magnetism in Cu. Superconducting quantum interference device (SQUID) room-temperature (300K) measurements displayed no size correlation to the ferromagnetic behaviour observed in Cu nanoparticles ranging from 4.5 ± 1.0 nm to 9.0 ± 1.8 nm in diameter. Moreover, magnetic quartz crystal microbalance in situ tests of 4.5 ± 1.0 nm nanoparticles under vacuum conditions showed magnetic behaviour only after the onset of oxidation. SQUID analysis conducted on Cu thin films exposed to several heat treatments demonstrated minor oxidation inducing higher ferromagnetic responses compared to extended oxidation. Further analysis of nanomaterial samples exhibiting the highest magnetic responses indicated an atomic ratio of ~3-5:1 Cu:O suggesting non-stoichiometric oxidation as the source of the ferromagnetic signature.
Report Number
DRDC-RDDC-2018-N080 — External Literature
Date of publication
01 Jun 2018
Number of Pages
35
Translation of
The American Chemical Society's Journal of Physical Chemistry C, J. Phys. Chem C, 2016, 120(13), pp 7388-7396
DSTKIM No
CA046152
CANDIS No
806635
Format(s):
Electronic Document(PDF)

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