Loss of spin glass behavior in ultrathin AuFe films

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.81.132402
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Journal titlePhysical review. B, Condensed matter and materials physics
Pages132402-1132402-4; # of pages: 4
AbstractWe determined the temperature dependence of the magnetization of thin Au97Fe3 films in the thickness range between 1 and 50 nm by performing polarized neutron reflectivity measurements in a magnetic field of 6 T in a temperature range from 200 down to 2 K. For the films in the thickness range from 50 to 2 nm, we observed a Brillouin-type behavior of noninteracting Fe atoms down to 50 K followed by a strong reduction compared to the Brillouin curve below 50 K. This reduction in the magnetization is a measure of the spin glass frustration and depends on the film thickness below 20 nm as shown in our previous study [M. Saoudi, H. Fritzsche, G. J. Nieuwenhuys, and M. B. S. Hesselberth, Phys. Rev. Lett. 100, 057204 (2008)] on Au₉₇Fe₃ films. The present study is a continuation of this work extending the thickness range down to 1 nm. It shows that below 10 nm, the reduction in the spin glass magnetization compared to a Brillouin-type behavior decreases with decreasing film thickness. Finally, the magnetization of the 1-nm-thick film could be described with a Brillouin function also below 50 K proving that ultrathin Au₉₇Fe₃ layers below 1 nm do not show spin glass behavior anymore but are paramagnetic.
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AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
Peer reviewedYes
NPARC number16959086
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Record identifier59265641-5394-4c1a-8f14-591309f069c7
Record created2011-04-07
Record modified2016-05-09
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