Magnetic clusters in ilmenite-hematite solid solutions

Cathrine Frandsen; B. P. Burton; Helge Kildahl Rasmussen; S. A. McEnroe; Steen Mørup

doi:10.1103/PhysRevB.81.224423

Magnetic clusters in ilmenite-hematite solid solutions

Cathrine Frandsen, B. P. Burton, Helge Kildahl Rasmussen, S. A. McEnroe, Steen Mørup

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Abstract

We report the use of high-field 57Fe Mössbauer spectroscopy to resolve the magnetic ordering of ilmenite-hematite [xFeTiO3−(1−x)Fe2O3] solid solutions with x>0.5. We find that nanometer-sized hematite clusters exist within an ilmenite-like matrix. Although both phases are antiferromagnetically ordered, the hematite clusters show ferrimagnetic behavior due to superexchange coupling with Fe2+ in ilmenite. For ilmenite-rich samples (x=0.95), the clusters are isolated and superparamagnetic. For more hematite-rich samples with x=0.80 and x=0.70, the clusters interact to form a cluster glass.

Original language	English
Journal	Physical Review B Condensed Matter
Volume	81
Issue number	22
Pages (from-to)	224423
ISSN	0163-1829
DOIs	https://doi.org/10.1103/PhysRevB.81.224423
Publication status	Published - 2010

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title = "Magnetic clusters in ilmenite-hematite solid solutions",

abstract = "We report the use of high-field 57Fe M{\"o}ssbauer spectroscopy to resolve the magnetic ordering of ilmenite-hematite [xFeTiO3−(1−x)Fe2O3] solid solutions with x>0.5. We find that nanometer-sized hematite clusters exist within an ilmenite-like matrix. Although both phases are antiferromagnetically ordered, the hematite clusters show ferrimagnetic behavior due to superexchange coupling with Fe2+ in ilmenite. For ilmenite-rich samples (x=0.95), the clusters are isolated and superparamagnetic. For more hematite-rich samples with x=0.80 and x=0.70, the clusters interact to form a cluster glass.",

author = "Cathrine Frandsen and Burton, {B. P.} and Rasmussen, {Helge Kildahl} and McEnroe, {S. A.} and Steen M{\o}rup",

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language = "English",

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T1 - Magnetic clusters in ilmenite-hematite solid solutions

AU - Frandsen, Cathrine

AU - Burton, B. P.

AU - Rasmussen, Helge Kildahl

AU - McEnroe, S. A.

AU - Mørup, Steen

PY - 2010

Y1 - 2010

N2 - We report the use of high-field 57Fe Mössbauer spectroscopy to resolve the magnetic ordering of ilmenite-hematite [xFeTiO3−(1−x)Fe2O3] solid solutions with x>0.5. We find that nanometer-sized hematite clusters exist within an ilmenite-like matrix. Although both phases are antiferromagnetically ordered, the hematite clusters show ferrimagnetic behavior due to superexchange coupling with Fe2+ in ilmenite. For ilmenite-rich samples (x=0.95), the clusters are isolated and superparamagnetic. For more hematite-rich samples with x=0.80 and x=0.70, the clusters interact to form a cluster glass.

AB - We report the use of high-field 57Fe Mössbauer spectroscopy to resolve the magnetic ordering of ilmenite-hematite [xFeTiO3−(1−x)Fe2O3] solid solutions with x>0.5. We find that nanometer-sized hematite clusters exist within an ilmenite-like matrix. Although both phases are antiferromagnetically ordered, the hematite clusters show ferrimagnetic behavior due to superexchange coupling with Fe2+ in ilmenite. For ilmenite-rich samples (x=0.95), the clusters are isolated and superparamagnetic. For more hematite-rich samples with x=0.80 and x=0.70, the clusters interact to form a cluster glass.

U2 - 10.1103/PhysRevB.81.224423

DO - 10.1103/PhysRevB.81.224423

M3 - Journal article

VL - 81

SP - 224423

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

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

SN - 1098-0121

IS - 22

ER -

Magnetic clusters in ilmenite-hematite solid solutions

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