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Effective magnetic ...
Effective magnetic moment of magnetic multicore nanoparticles
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- Schaller, Vincent, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Wahnström, Göran, 1955 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Sanz-Velasco, Anke, 1971 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gustafsson, Stefan, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Olsson, Eva, 1960 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Enoksson, Peter, 1957 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Johansson, Christer (författare)
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(creator_code:org_t)
- 2009
- 2009
- Engelska.
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Ingår i: Physical Review B - Condensed Matter and Materials Physics. - 2469-9950 .- 2469-9969. ; 80:9, s. 092406-
- Relaterad länk:
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http://dx.doi.org/10...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We carry out Monte Carlo simulations to study the effective magnetic moment mu(eff) in the low-field region of magnetic multicore nanoparticles. Transmission electron microscopy and scanning electron microscopy images show that these particles contain a number of magnetic nanocrystals (MNCs) randomly packed in a single cluster of total volume V(tot). We illustrate how the initial magnetic susceptibility chi(0) of magnetic multicore nanoparticles can be straightforward derived from mu(eff) computed at zero magnetic field. We observe that dipolar interactions between MNCs and polydispersity of the MNCs contribute to increase and to decrease mu(eff)/V(tot), respectively, while magnetic anisotropy of the MNCs does not show any effect. In all three cases, mu(eff)/V(tot) can be described by a linear relation to (mu B/k(B)T)(2) that we analytically derived for low applied fields.
Ämnesord
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- magnetic anisotropy
- exchange interactions (electron)
- Monte Carlo methods
- nanoparticles
- transmission electron microscopy
- magnetic moments
- magnetic susceptibility
- scanning electron microscopy
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