Low temperature ferromagnetism in chemically ordered FeRh nanocrystals

A. Hillion, A. Cavallin, S. Vlaic, A. Tamion, F. Tournus, G. Khadra, J. Dreiser, C. Piamonteze, F. Nolting, S. Rusponi, K. Sato, T. J. Konno, O. Proux, V. Dupuis, H. Brune

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

In sharp contrast to previous studies on FeRh bulk, thin films, and nanoparticles, we report the persistence of ferromagnetic order down to 3 K for size-selected 3.3 nm diameter nanocrystals embedded into an amorphous carbon matrix. The annealed nanoparticles have a B2 structure with alternating atomic Fe and Rh layers. X-ray magnetic dichroism and superconducting quantum interference device measurements demonstrate ferromagnetic alignment of the Fe and Rh magnetic moments of 3 and 1μB, respectively. The ferromagnetic order is ascribed to the finite-size induced structural relaxation observed in extended x-ray absorption spectroscopy.

Original languageEnglish
Article number087207
JournalPhysical review letters
Volume110
Issue number8
DOIs
Publication statusPublished - 2013 Feb 21

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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