Magnetic properties of La0.7Ca0.3MnO3 manganite bulk and nanometer-sized crystals

E. Rozenberg; M. I. Tsindlekht; I. Felner; E. Sominski; A. Gedanken; Ya M. Mukovskii

doi:10.1109/tmag.2007.894360

Magnetic properties of La_0.7Ca_0.3MnO₃ manganite bulk and nanometer-sized crystals

E. Rozenberg, M. I. Tsindlekht, I. Felner, E. Sominski, A. Gedanken, Ya M. Mukovskii

Department of Chemistry

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

18 Scopus citations

Abstract

AC and DC magnetic measurements in temperature interval 5-300 K and at external magnetic field H ≤ 5 T were employed to probe and compare magnetic ordering in bulk and nanometer-sized (15 ± 2 nm) La_0.7Ca _0.3MnO₃ single crystals. The respective Curie temperatures (T_C) ∼ 239 K and 233 K, close to each other are observed in bulk and nano samples. While, their low T spontaneous magnetizations are strongly different, being about 3.6 and 1.2 μ_B/f.u., respectively. AC susceptibility (χ) of a bulk sample, measured at H_dc = 0, shows a maximum of χ(T) at T ∼ T_C. In a contrast, χ(T) of the nano-sample demonstrates a broad maximum far below its T_C. In the nano-sample both real and imaginary parts of χ are frequency dependent within the 5-280 K range. In a contrary, the frequency dependence is observed only for imaginary part of χ in bulk crystal. It is concluded that the similar ferromagnetic ground state exists in both considered samples; however, it is strongly frustrated in agglomerated nano particles due to surface magnetic disorder and interparticle interactions.

Original language	English
Pages (from-to)	3052-3054
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	43
Issue number	6
DOIs	https://doi.org/10.1109/tmag.2007.894360
State	Published - Jun 2007

Bibliographical note

Funding Information:
This work was supported in part by the Israeli Science Foundation administered by the Israel Academy of Sciences and Humanities under Grant 845/05.

Funding

This work was supported in part by the Israeli Science Foundation administered by the Israel Academy of Sciences and Humanities under Grant 845/05.

Funders	Funder number
Israeli Science Foundation
Israel Academy of Sciences and Humanities	845/05

Keywords

Magnetic susceptibility
Magnetization processes
Manganese compounds
Nanotechnology

Access to Document

10.1109/tmag.2007.894360

Cite this

@article{31d6d0a35c0945a78809c09039cf5047,

title = "Magnetic properties of La0.7Ca0.3MnO3 manganite bulk and nanometer-sized crystals",

abstract = "AC and DC magnetic measurements in temperature interval 5-300 K and at external magnetic field H ≤ 5 T were employed to probe and compare magnetic ordering in bulk and nanometer-sized (15 ± 2 nm) La0.7Ca 0.3MnO3 single crystals. The respective Curie temperatures (TC) ∼ 239 K and 233 K, close to each other are observed in bulk and nano samples. While, their low T spontaneous magnetizations are strongly different, being about 3.6 and 1.2 μB/f.u., respectively. AC susceptibility (χ) of a bulk sample, measured at Hdc = 0, shows a maximum of χ(T) at T ∼ TC. In a contrast, χ(T) of the nano-sample demonstrates a broad maximum far below its TC. In the nano-sample both real and imaginary parts of χ are frequency dependent within the 5-280 K range. In a contrary, the frequency dependence is observed only for imaginary part of χ in bulk crystal. It is concluded that the similar ferromagnetic ground state exists in both considered samples; however, it is strongly frustrated in agglomerated nano particles due to surface magnetic disorder and interparticle interactions.",

keywords = "Magnetic susceptibility, Magnetization processes, Manganese compounds, Nanotechnology",

author = "E. Rozenberg and Tsindlekht, {M. I.} and I. Felner and E. Sominski and A. Gedanken and Mukovskii, {Ya M.}",

note = "Funding Information: This work was supported in part by the Israeli Science Foundation administered by the Israel Academy of Sciences and Humanities under Grant 845/05.",

year = "2007",

month = jun,

doi = "10.1109/tmag.2007.894360",

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T1 - Magnetic properties of La0.7Ca0.3MnO3 manganite bulk and nanometer-sized crystals

AU - Rozenberg, E.

AU - Tsindlekht, M. I.

AU - Felner, I.

AU - Sominski, E.

AU - Gedanken, A.

AU - Mukovskii, Ya M.

N1 - Funding Information: This work was supported in part by the Israeli Science Foundation administered by the Israel Academy of Sciences and Humanities under Grant 845/05.

PY - 2007/6

Y1 - 2007/6

N2 - AC and DC magnetic measurements in temperature interval 5-300 K and at external magnetic field H ≤ 5 T were employed to probe and compare magnetic ordering in bulk and nanometer-sized (15 ± 2 nm) La0.7Ca 0.3MnO3 single crystals. The respective Curie temperatures (TC) ∼ 239 K and 233 K, close to each other are observed in bulk and nano samples. While, their low T spontaneous magnetizations are strongly different, being about 3.6 and 1.2 μB/f.u., respectively. AC susceptibility (χ) of a bulk sample, measured at Hdc = 0, shows a maximum of χ(T) at T ∼ TC. In a contrast, χ(T) of the nano-sample demonstrates a broad maximum far below its TC. In the nano-sample both real and imaginary parts of χ are frequency dependent within the 5-280 K range. In a contrary, the frequency dependence is observed only for imaginary part of χ in bulk crystal. It is concluded that the similar ferromagnetic ground state exists in both considered samples; however, it is strongly frustrated in agglomerated nano particles due to surface magnetic disorder and interparticle interactions.

AB - AC and DC magnetic measurements in temperature interval 5-300 K and at external magnetic field H ≤ 5 T were employed to probe and compare magnetic ordering in bulk and nanometer-sized (15 ± 2 nm) La0.7Ca 0.3MnO3 single crystals. The respective Curie temperatures (TC) ∼ 239 K and 233 K, close to each other are observed in bulk and nano samples. While, their low T spontaneous magnetizations are strongly different, being about 3.6 and 1.2 μB/f.u., respectively. AC susceptibility (χ) of a bulk sample, measured at Hdc = 0, shows a maximum of χ(T) at T ∼ TC. In a contrast, χ(T) of the nano-sample demonstrates a broad maximum far below its TC. In the nano-sample both real and imaginary parts of χ are frequency dependent within the 5-280 K range. In a contrary, the frequency dependence is observed only for imaginary part of χ in bulk crystal. It is concluded that the similar ferromagnetic ground state exists in both considered samples; however, it is strongly frustrated in agglomerated nano particles due to surface magnetic disorder and interparticle interactions.

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