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Spin-correlations and magnetic structure in an Fe monolayer on 5d transition metal surfaces

Simon, E. and Palotás, Krisztián and Ujfalussy, B. and Deák, András and Stocks, G. M. and Szunyogh, L. (2014) Spin-correlations and magnetic structure in an Fe monolayer on 5d transition metal surfaces. Journal of Physics: Condensed Matter, 26 (18). p. 186001. ISSN 0953-8984

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Abstract

We present a detailed first principles study on the magnetic structure of an Fe monolayer on different surfaces of 5d transition metals. We use the spin-cluster expansion technique to obtain parameters of a spin model, and predict the possible magnetic ground state of the studied systems by employing the mean field approach and, in certain cases, by spin dynamics calculations. We point out that the number of shells considered for the isotropic exchange interactions plays a crucial role in the determination of the magnetic ground state. In the case of Ta substrate we demonstrate that the out-of-plane relaxation of the Fe monolayer causes a transition from ferromagnetic to antiferromagnetic ground state. We examine the relative magnitude of nearest neighbour Dzyaloshinskii–Moriya (D) and isotropic (J) exchange interactions in order to get insight into the nature of magnetic pattern formations. For the Fe/Os(0 0 0 1) system we calculate a very large D/J ratio, correspondingly, a spin spiral ground state. We find that, mainly through the leading isotropic exchange and Dzyaloshinskii–Moriya interactions, the inward layer relaxation substantially influences the magnetic ordering of the Fe monolayer. For the Fe/Re(0 0 0 1) system characterized by large antiferromagnetic interactions we also determine the chirality of the 120° Néel-type ground state.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika > QC06 Physics of condensed matter / szilárdtestfizika
Depositing User: Dr. Krisztián Palotás
Date Deposited: 22 Sep 2014 22:09
Last Modified: 03 Apr 2023 08:16
URI: http://real.mtak.hu/id/eprint/16058

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