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Spin dynamics in an ultrathin Fe film in the vicinity of the superparamagnetic/ferromagnetic phase transition
KTH, Superseded Departments, Materials Science and Engineering. University of Cambridge, United Kingdom .ORCID iD: 0000-0003-2170-0076
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2004 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 70, no 2, 024420- p.Article in journal (Refereed) Published
Abstract [en]

Epitaxially grown bcc Fe films on GaAs (100)-{4 × 6} were investigated at room temperature by in situ Brillouin light scattering. Remarkably we observed spin modes in the superparamagnetic regime for thicknesses far below the critical thickness of dc ≅ 4 ML at which ferromagnetism occurs. These modes are shown to correspond to the intrinsic modes of the physically separated Fe nanoclusters coupled by dipolar interactions. Furthermore we observed the influence of critical spin fluctuations in the vicinity of the phase transition as evidenced by an abrupt increase in spin wave peak linewidth and a sharp decrease in spin wave frequency with decreasing film thickness d in the ferromagnetic regime.

Place, publisher, year, edition, pages
2004. Vol. 70, no 2, 024420- p.
Keyword [en]
arsenic, ferromagnetic material, gallium, iron, acceleration, article, film, magnetism, molecular dynamics, molecular interaction, phase transition, thickness
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-157203DOI: 10.1103/PhysRevB.70.024420ISI: 000222996600053ScopusID: 2-s2.0-42749107167OAI: diva2:771816

QC 20141215

Available from: 2014-12-15 Created: 2014-12-08 Last updated: 2014-12-15Bibliographically approved

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Ström, Valter
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