Nano-particles of La0.9Ca0.1MnO3 manganite: Size-induced change of magnetic ground state and interplay between surface and core contributions to its magnetism

Evgeny Rosenberg; S. S. Banerjee; I. Felner; E. Sominski; A. Gedanken

doi:10.1016/j.jnoncrysol.2006.12.049

Nano-particles of La_0.9Ca_0.1MnO₃ manganite: Size-induced change of magnetic ground state and interplay between surface and core contributions to its magnetism

Evgeny Rosenberg, S. S. Banerjee, I. Felner, E. Sominski, A. Gedanken

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

The structure, dc and ac magnetic properties of sonochemically prepared nano-particles of La_0.9Ca_0.1MnO₃ compound were studied as compared to those of the bulk sample of the same composition. It is shown that transition to the nanometer sized scale results in a change of the magnetic order from a mixed antiferro + ferromagnetic to a pure ferromagnetic one due to the improvement of crystallinity and suppression of chemical/magnetic disorder in nano-particles. The surface contribution to its magnetism leads to a super-paramagnetic-like ordering supposedly due to the interfacial exchange coupling via surface tunneling of carriers above the Curie point (T_C). Below T_C ∼ 90 K, a notable contribution of surface spin disorder reduces the spontaneous magnetization of the nano-sample as compared to the bulk-one.

Original language	English
Pages (from-to)	817-819
Number of pages	3
Journal	Journal of Non-Crystalline Solids
Volume	353
Issue number	8-10
DOIs	https://doi.org/10.1016/j.jnoncrysol.2006.12.049
State	Published - 15 Apr 2007
Externally published	Yes

Keywords

Nano-crystals
Nano-particles
TEM/STEM

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/j.jnoncrysol.2006.12.049

Cite this

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title = "Nano-particles of La0.9Ca0.1MnO3 manganite: Size-induced change of magnetic ground state and interplay between surface and core contributions to its magnetism",

abstract = "The structure, dc and ac magnetic properties of sonochemically prepared nano-particles of La0.9Ca0.1MnO3 compound were studied as compared to those of the bulk sample of the same composition. It is shown that transition to the nanometer sized scale results in a change of the magnetic order from a mixed antiferro + ferromagnetic to a pure ferromagnetic one due to the improvement of crystallinity and suppression of chemical/magnetic disorder in nano-particles. The surface contribution to its magnetism leads to a super-paramagnetic-like ordering supposedly due to the interfacial exchange coupling via surface tunneling of carriers above the Curie point (TC). Below TC ∼ 90 K, a notable contribution of surface spin disorder reduces the spontaneous magnetization of the nano-sample as compared to the bulk-one.",

keywords = "Nano-crystals, Nano-particles, TEM/STEM",

author = "Evgeny Rosenberg and Banerjee, {S. S.} and I. Felner and E. Sominski and A. Gedanken",

note = "Funding Information: The authors acknowledge the financial support by ISF Grant No. 845/05. S.S.B. acknowledges support by AOARD-064054 grant.",

year = "2007",

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language = "English",

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T1 - Nano-particles of La0.9Ca0.1MnO3 manganite

T2 - Size-induced change of magnetic ground state and interplay between surface and core contributions to its magnetism

AU - Rosenberg, Evgeny

AU - Banerjee, S. S.

AU - Felner, I.

AU - Sominski, E.

AU - Gedanken, A.

N1 - Funding Information: The authors acknowledge the financial support by ISF Grant No. 845/05. S.S.B. acknowledges support by AOARD-064054 grant.

PY - 2007/4/15

Y1 - 2007/4/15

N2 - The structure, dc and ac magnetic properties of sonochemically prepared nano-particles of La0.9Ca0.1MnO3 compound were studied as compared to those of the bulk sample of the same composition. It is shown that transition to the nanometer sized scale results in a change of the magnetic order from a mixed antiferro + ferromagnetic to a pure ferromagnetic one due to the improvement of crystallinity and suppression of chemical/magnetic disorder in nano-particles. The surface contribution to its magnetism leads to a super-paramagnetic-like ordering supposedly due to the interfacial exchange coupling via surface tunneling of carriers above the Curie point (TC). Below TC ∼ 90 K, a notable contribution of surface spin disorder reduces the spontaneous magnetization of the nano-sample as compared to the bulk-one.

AB - The structure, dc and ac magnetic properties of sonochemically prepared nano-particles of La0.9Ca0.1MnO3 compound were studied as compared to those of the bulk sample of the same composition. It is shown that transition to the nanometer sized scale results in a change of the magnetic order from a mixed antiferro + ferromagnetic to a pure ferromagnetic one due to the improvement of crystallinity and suppression of chemical/magnetic disorder in nano-particles. The surface contribution to its magnetism leads to a super-paramagnetic-like ordering supposedly due to the interfacial exchange coupling via surface tunneling of carriers above the Curie point (TC). Below TC ∼ 90 K, a notable contribution of surface spin disorder reduces the spontaneous magnetization of the nano-sample as compared to the bulk-one.

KW - Nano-crystals

KW - Nano-particles

KW - TEM/STEM

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