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Spin dynamics in an...
Spin dynamics in an ultrathin Fe film in the vicinity of the superparamagnetic/ferromagnetic phase transition
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Steinmuller, S. J. (författare)
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Tselepi, M. (författare)
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Wastlbauer, G. (författare)
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- Ström, Valter (författare)
- KTH,Materialvetenskap,University of Cambridge, United Kingdom
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Gillingham, D. M. (författare)
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Ionescu, A. (författare)
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Bland, J. A. C. (författare)
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(creator_code:org_t)
- 2004
- 2004
- Engelska.
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 70:2, s. 024420-
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- arsenic
- ferromagnetic material
- gallium
- iron
- acceleration
- article
- film
- magnetism
- molecular dynamics
- molecular interaction
- phase transition
- thickness
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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