Oriented attachment and exchange coupling of α-Fe2O3 nanoparticles

Cathrine Frandsen; Christian Robert Haffenden Bahl; Bente Lebech; Kim Lefmann; Luise Theil Kuhn; L Keller; Niels Hessel Andersen; M. V. Zimmermann; Erik Johnson; Stine Nyborg Klausen; Steen Mørup

doi:10.1103/PhysRevB.72.214406

Oriented attachment and exchange coupling of α-Fe₂O₃ nanoparticles

Cathrine Frandsen, Christian Robert Haffenden Bahl, Bente Lebech, Kim Lefmann, Luise Theil Kuhn, L Keller, Niels Hessel Andersen, M. V. Zimmermann, Erik Johnson, Stine Nyborg Klausen, Steen Mørup

Department of Physics

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

We show that antiferromagnetic nanoparticles of alpha-Fe2O3 (hematite) under wet conditions can attach into chains along a common [001] axis. Electron microscopy shows that such chains typically consist of two to five particles. X-ray and neutron diffraction studies show that both structural and magnetic correlations exist across the interfaces along the [001] direction. This gives direct evidence for exchange coupling between particles. Exchange coupling between nanoparticles can suppress superparamagnetic relaxation and it may play a role for attachment along preferred directions. The relations between exchange coupling, magnetic properties, and oriented attachment are discussed.

Original language	English
Journal	Physical Review B Condensed Matter
Volume	72
Issue number	21
Pages (from-to)	214406
Number of pages	7
ISSN	0163-1829
DOIs	https://doi.org/10.1103/PhysRevB.72.214406
Publication status	Published - 2005

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http://prb.aps.org/abstract/PRB/v72/i21/e214406

Cite this

@article{04847560b30640a0a0409f7ef109434a,

title = "Oriented attachment and exchange coupling of α-Fe2O3 nanoparticles",

abstract = "We show that antiferromagnetic nanoparticles of alpha-Fe2O3 (hematite) under wet conditions can attach into chains along a common [001] axis. Electron microscopy shows that such chains typically consist of two to five particles. X-ray and neutron diffraction studies show that both structural and magnetic correlations exist across the interfaces along the [001] direction. This gives direct evidence for exchange coupling between particles. Exchange coupling between nanoparticles can suppress superparamagnetic relaxation and it may play a role for attachment along preferred directions. The relations between exchange coupling, magnetic properties, and oriented attachment are discussed.",

keywords = "5-I nano",

author = "Cathrine Frandsen and Bahl, {Christian Robert Haffenden} and Bente Lebech and Kim Lefmann and Kuhn, {Luise Theil} and L Keller and Andersen, {Niels Hessel} and Zimmermann, {M. V.} and Erik Johnson and Klausen, {Stine Nyborg} and Steen M{\o}rup",

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pages = "214406",

journal = "Physical Review B (Condensed Matter and Materials Physics)",

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Oriented attachment and exchange coupling of α-Fe₂O₃ nanoparticles. / Frandsen, Cathrine ; Bahl, Christian Robert Haffenden ; Lebech, Bente; Lefmann, Kim; Kuhn, Luise Theil; Keller, L; Andersen, Niels Hessel; Zimmermann, M. V.; Johnson, Erik; Klausen, Stine Nyborg; Mørup, Steen.

In: Physical Review B Condensed Matter, Vol. 72, No. 21, 2005, p. 214406.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - Oriented attachment and exchange coupling of α-Fe2O3 nanoparticles

AU - Frandsen, Cathrine

AU - Bahl, Christian Robert Haffenden

AU - Lebech, Bente

AU - Lefmann, Kim

AU - Kuhn, Luise Theil

AU - Keller, L

AU - Andersen, Niels Hessel

AU - Zimmermann, M. V.

AU - Johnson, Erik

AU - Klausen, Stine Nyborg

AU - Mørup, Steen

PY - 2005

Y1 - 2005

N2 - We show that antiferromagnetic nanoparticles of alpha-Fe2O3 (hematite) under wet conditions can attach into chains along a common [001] axis. Electron microscopy shows that such chains typically consist of two to five particles. X-ray and neutron diffraction studies show that both structural and magnetic correlations exist across the interfaces along the [001] direction. This gives direct evidence for exchange coupling between particles. Exchange coupling between nanoparticles can suppress superparamagnetic relaxation and it may play a role for attachment along preferred directions. The relations between exchange coupling, magnetic properties, and oriented attachment are discussed.

AB - We show that antiferromagnetic nanoparticles of alpha-Fe2O3 (hematite) under wet conditions can attach into chains along a common [001] axis. Electron microscopy shows that such chains typically consist of two to five particles. X-ray and neutron diffraction studies show that both structural and magnetic correlations exist across the interfaces along the [001] direction. This gives direct evidence for exchange coupling between particles. Exchange coupling between nanoparticles can suppress superparamagnetic relaxation and it may play a role for attachment along preferred directions. The relations between exchange coupling, magnetic properties, and oriented attachment are discussed.

KW - 5-I nano

U2 - 10.1103/PhysRevB.72.214406

DO - 10.1103/PhysRevB.72.214406

M3 - Journal article

VL - 72

SP - 214406

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 1098-0121

IS - 21

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