Surface and exchange-bias effects in compacted CaMnO3-δ nanoparticles

V. Markovich; I. Fita; A. Wisniewski; R. Puzniak; D. Mogilyansky; L. Titelman; L. Vradman; M. Herskowitz; G. Gorodetsky

doi:10.1103/PhysRevB.77.054410

Surface and exchange-bias effects in compacted CaMnO3-δ nanoparticles

V. Markovich, I. Fita, A. Wisniewski, R. Puzniak, D. Mogilyansky, L. Titelman, L. Vradman, M. Herskowitz, G. Gorodetsky

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60 Scopus citations

Abstract

Magnetic properties of compacted 50 nm CaMnO3-δ (CMO) nanoparticles have been investigated. Measurements of ac-susceptibility exhibit upon cooling two magnetic transitions at T∼270 K accompanied by a small spontaneous magnetic moment and a para-antiferromagnetic (AFM) transition at TN ∼120 K, observed previously in bulk CMO. Asymmetric magnetization hysteresis loops observed in applied magnetic fields H≤90 kOe are attributed to an exchange coupling between the antiferromagnetic core and the ferromagnetic (FM) shell of the CMO nanoparticles. This work provides the observation of exchange bias effect in manganite nanoparticles with inverted AFM-core-FM-shell structure, as compared to the typical FM-core-AFM-shell. Effects of surface and exchange anisotropy are also discussed.

Original language	English
Article number	054410
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	77
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.77.054410
State	Published - 7 Feb 2008

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Surface and exchange-bias effects in compacted CaMnO3-δ nanoparticles",

abstract = "Magnetic properties of compacted 50 nm CaMnO3-δ (CMO) nanoparticles have been investigated. Measurements of ac-susceptibility exhibit upon cooling two magnetic transitions at T∼270 K accompanied by a small spontaneous magnetic moment and a para-antiferromagnetic (AFM) transition at TN ∼120 K, observed previously in bulk CMO. Asymmetric magnetization hysteresis loops observed in applied magnetic fields H≤90 kOe are attributed to an exchange coupling between the antiferromagnetic core and the ferromagnetic (FM) shell of the CMO nanoparticles. This work provides the observation of exchange bias effect in manganite nanoparticles with inverted AFM-core-FM-shell structure, as compared to the typical FM-core-AFM-shell. Effects of surface and exchange anisotropy are also discussed.",

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language = "English",

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T1 - Surface and exchange-bias effects in compacted CaMnO3-δ nanoparticles

AU - Markovich, V.

AU - Fita, I.

AU - Wisniewski, A.

AU - Puzniak, R.

AU - Mogilyansky, D.

AU - Titelman, L.

AU - Vradman, L.

AU - Herskowitz, M.

AU - Gorodetsky, G.

PY - 2008/2/7

Y1 - 2008/2/7

N2 - Magnetic properties of compacted 50 nm CaMnO3-δ (CMO) nanoparticles have been investigated. Measurements of ac-susceptibility exhibit upon cooling two magnetic transitions at T∼270 K accompanied by a small spontaneous magnetic moment and a para-antiferromagnetic (AFM) transition at TN ∼120 K, observed previously in bulk CMO. Asymmetric magnetization hysteresis loops observed in applied magnetic fields H≤90 kOe are attributed to an exchange coupling between the antiferromagnetic core and the ferromagnetic (FM) shell of the CMO nanoparticles. This work provides the observation of exchange bias effect in manganite nanoparticles with inverted AFM-core-FM-shell structure, as compared to the typical FM-core-AFM-shell. Effects of surface and exchange anisotropy are also discussed.

AB - Magnetic properties of compacted 50 nm CaMnO3-δ (CMO) nanoparticles have been investigated. Measurements of ac-susceptibility exhibit upon cooling two magnetic transitions at T∼270 K accompanied by a small spontaneous magnetic moment and a para-antiferromagnetic (AFM) transition at TN ∼120 K, observed previously in bulk CMO. Asymmetric magnetization hysteresis loops observed in applied magnetic fields H≤90 kOe are attributed to an exchange coupling between the antiferromagnetic core and the ferromagnetic (FM) shell of the CMO nanoparticles. This work provides the observation of exchange bias effect in manganite nanoparticles with inverted AFM-core-FM-shell structure, as compared to the typical FM-core-AFM-shell. Effects of surface and exchange anisotropy are also discussed.

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Surface and exchange-bias effects in compacted CaMnO3-δ nanoparticles

Abstract

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