Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocomposites

Cathrine Frandsen; Kim Lefmann; Bente Lebech; Christian Robert Haffenden Bahl; Erik Brok; S. N. Ancona; Luise Theil Kuhn; L. Keller; Takeshi Kasama; Lionel Cervera Gontard; Steen Mørup

doi:10.1103/PhysRevB.84.214435

Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocomposites

Cathrine Frandsen, Kim Lefmann, Bente Lebech, Christian Robert Haffenden Bahl, Erik Brok, S. N. Ancona, Luise Theil Kuhn, L. Keller, Takeshi Kasama, Lionel Cervera Gontard, Steen Mørup

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Abstract

We report that the spin structure of alpha-Fe2O3 nanoparticles rotates coherently out of the basal (001) plane at low temperatures when interacting with thin plate-shaped NiO nanoparticles. The observed spin reorientation (up to similar to 70 degrees) in alpha-Fe2O3 nanoparticles has, in appearance, similarities to the Morin transition in bulk alpha-Fe2O3, but its origin is different-it is caused by exchange coupling between aggregated nanoparticles of alpha-Fe2O3 and NiO with different directions of easy axes of magnetization.

Original language	English
Journal	Physical Review B Condensed Matter
Volume	84
Issue number	21
Pages (from-to)	214435 (10 pages)
ISSN	0163-1829
DOIs	https://doi.org/10.1103/PhysRevB.84.214435
Publication status	Published - 2011

Keywords

HEMATITE NANOPARTICLES
Dependence
Physics
MAGNETIC-PROPERTIES
AGGREGATION
CRYSTAL-GROWTH
ANISOTROPY
Size
NIO NANOPARTICLES

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Frandsen, C., Lefmann, K., Lebech, B., Bahl, C. R. H., Brok, E., Ancona, S. N., Kuhn, L. T., Keller, L., Kasama, T., Gontard, L. C., & Mørup, S. (2011). Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocomposites. Physical Review B Condensed Matter, 84(21), 214435 (10 pages). https://doi.org/10.1103/PhysRevB.84.214435

@article{951268901ce9420ab3b9ccb9477c72ae,

title = "Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocomposites",

abstract = "We report that the spin structure of alpha-Fe2O3 nanoparticles rotates coherently out of the basal (001) plane at low temperatures when interacting with thin plate-shaped NiO nanoparticles. The observed spin reorientation (up to similar to 70 degrees) in alpha-Fe2O3 nanoparticles has, in appearance, similarities to the Morin transition in bulk alpha-Fe2O3, but its origin is different-it is caused by exchange coupling between aggregated nanoparticles of alpha-Fe2O3 and NiO with different directions of easy axes of magnetization.",

keywords = "HEMATITE NANOPARTICLES, Dependence, Physics, MAGNETIC-PROPERTIES, AGGREGATION, CRYSTAL-GROWTH, ANISOTROPY, Size, NIO NANOPARTICLES",

author = "Cathrine Frandsen and Kim Lefmann and Bente Lebech and Bahl, {Christian Robert Haffenden} and Erik Brok and Ancona, {S. N.} and Kuhn, {Luise Theil} and L. Keller and Takeshi Kasama and Gontard, {Lionel Cervera} and Steen M{\o}rup",

year = "2011",

doi = "10.1103/PhysRevB.84.214435",

language = "English",

volume = "84",

pages = "214435 (10 pages)",

journal = "Physical Review B Condensed Matter",

issn = "0163-1829",

publisher = "American Physical Society",

number = "21",

}

Frandsen, C, Lefmann, K, Lebech, B, Bahl, CRH, Brok, E, Ancona, SN, Kuhn, LT, Keller, L, Kasama, T, Gontard, LC & Mørup, S 2011, 'Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocomposites', Physical Review B Condensed Matter, vol. 84, no. 21, pp. 214435 (10 pages). https://doi.org/10.1103/PhysRevB.84.214435

TY - JOUR

T1 - Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocomposites

AU - Frandsen, Cathrine

AU - Lefmann, Kim

AU - Lebech, Bente

AU - Bahl, Christian Robert Haffenden

AU - Brok, Erik

AU - Ancona, S. N.

AU - Kuhn, Luise Theil

AU - Keller, L.

AU - Kasama, Takeshi

AU - Gontard, Lionel Cervera

AU - Mørup, Steen

PY - 2011

Y1 - 2011

N2 - We report that the spin structure of alpha-Fe2O3 nanoparticles rotates coherently out of the basal (001) plane at low temperatures when interacting with thin plate-shaped NiO nanoparticles. The observed spin reorientation (up to similar to 70 degrees) in alpha-Fe2O3 nanoparticles has, in appearance, similarities to the Morin transition in bulk alpha-Fe2O3, but its origin is different-it is caused by exchange coupling between aggregated nanoparticles of alpha-Fe2O3 and NiO with different directions of easy axes of magnetization.

AB - We report that the spin structure of alpha-Fe2O3 nanoparticles rotates coherently out of the basal (001) plane at low temperatures when interacting with thin plate-shaped NiO nanoparticles. The observed spin reorientation (up to similar to 70 degrees) in alpha-Fe2O3 nanoparticles has, in appearance, similarities to the Morin transition in bulk alpha-Fe2O3, but its origin is different-it is caused by exchange coupling between aggregated nanoparticles of alpha-Fe2O3 and NiO with different directions of easy axes of magnetization.

KW - HEMATITE NANOPARTICLES

KW - Dependence

KW - Physics

KW - MAGNETIC-PROPERTIES

KW - AGGREGATION

KW - CRYSTAL-GROWTH

KW - ANISOTROPY

KW - Size

KW - NIO NANOPARTICLES

U2 - 10.1103/PhysRevB.84.214435

DO - 10.1103/PhysRevB.84.214435

M3 - Journal article

SN - 0163-1829

VL - 84

SP - 214435 (10 pages)

JO - Physical Review B Condensed Matter

JF - Physical Review B Condensed Matter

IS - 21

ER -

Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocomposites

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