Description
We study a Fe monolayer (ML) on the hexagonal Rh(111) andTc(0001) surfaces using density functional theory with the fullpotential linearized augmented plane wave method as implemented
in the FLEUR code. Surprisingly, antiferromagnetic (AFM) exchange
interaction between the Fe atoms is dominating. Due to topological
frustration on the triangular lattice, the AFM coupling leads to a 120◦
N´eel structure on Tc, while a novel double-row-wise AFM structure
(an AFM sequence of ferromagnetic bi-atomic rows of atoms) is found
on Rh(111). A better understanding of these phases of Fe on the 4d
transition-metals substrates [1] is obtained by analyzing the role of
exchange interactions in terms of the classical Heisenberg model and
additional higher order interactions. From this it can be seen that
higher order terms, in the form of 4-spin and bi-quadratic interactions, as well as the induced magnetic moments in the substrate play
an important role in the formation of the double-row-wise structure.
Possibilities to observe these structures with the spin-polarized scanning tunneling microscope are discussed.
Period | 23 Mar 2009 |
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Event title | DPG Spring Meeting: Spring Meeting of the Section Condensed Matter |
Event type | Conference |
Conference number | Dresden 2009 |
Location | Dresden, Germany, SaxonyShow on map |