Magnetic Binary Silicide Nanostructures

Ilan Goldfarb*, Federico Cesura, Matan Dascalu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In spite of numerous advantageous properties of silicides, magnetic properties are not among them. Here, the magnetic properties of epitaxial binary silicide nanostructures are discussed. The vast majority of binary transition-metal silicides lack ferromagnetic order in their bulk-size crystals. Silicides based on rare-earth metals are usually weak ferromagnets or antiferromagnets, yet both groups tend to exhibit increased magnetic ordering in low-dimensional nanostructures, in particular at low temperatures. The origin of this surprising phenomenon lies in undercoordinated atoms at the nanostructure extremities, such as 2D (surfaces/interfaces), 1D (edges), and 0D (corners) boundaries. Uncompensated superspins of edge atoms increase the nanostructure magnetic shape anisotropy to the extent where it prevails over its magnetocrystalline counterpart, thus providing a plausible route toward the design of a magnetic response from nanostructure arrays in Si-based devices, such as bit-patterned magnetic recording media and spin injectors.

Original languageEnglish
Article number1800004
JournalAdvanced Materials
Volume30
Issue number41
DOIs
StatePublished - 11 Oct 2018

Funding

FundersFunder number
Wolfson Applied Materials Research Centre
Weizmann Institute of Science
Israel Science Foundation1321/13
Tel Aviv University

    Keywords

    • epitaxial growth
    • magnetic silicides
    • nanostructures
    • scanning tunneling microscopy (STM)
    • superconducting quantum interference device (SQUID)

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