Electric field control of magnetism at the γ-FeSi2/Si(001) interface

Pati, Ranjit; Jin, Yongmei M.

doi:10.1007/s10853-020-05500-x

Cited by 2 publications

(1 citation statement)

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“…Unlike the epitaxial strain and free surface discussed above, the mismatch-induced atomic arrangements at the interface are expected to generate magnetism. For example, our previous calculations for γ-FeSi 2 /Si(001) systems show that the six-fold and seven-fold interfaces can exhibit a strong antiferromagnetic spin ordering, arising from the Fe( d )-Si( p )-Fe( d ) superexchange interaction [ 34 ]. Since no atomic-level structural details of the interface are available a priori , to examine the interface effect on magnetism, γ-FeSi 2 /Si(111) epitaxial nanoslabs with two types of interface, namely, Si-terminated and Fe-terminated, were considered.…”

Section: Resultsmentioning

confidence: 99%

Origin of Magnetism in γ-FeSi2/Si(111) Nanostructures

et al. 2021

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Magnetism has recently been observed in nominally nonmagnetic iron disilicide in the form of epitaxial γ-FeSi2 nanostructures on Si(111) substrate. To explore the origin of the magnetism in γ-FeSi2/Si(111) nanostructures, we performed a systematic first-principles study based on density functional theory. Several possible factors, such as epitaxial strain, free surface, interface, and edge, were examined. The calculations show that among these factors, only the edge can lead to the magnetism in γ-FeSi2/Si(111) nanostructures. It is shown that magnetism exhibits a strong dependency on the local atomic structure of the edge. Furthermore, magnetism can be enhanced by creating multiple-step edges. In addition, the results also reveal that edge orientation can have a significant effect on magnetism. These findings, thus, provide insights into a strategy to tune the magnetic properties of γ-FeSi2/Si(111) nanostructures through controlling the structure, population, and orientation of the edges.

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Section: Resultsmentioning

confidence: 99%