Effect of particle size on magnetic properties of LaMnO3 + δ nanoparticles

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

doi:10.1016/j.spmi.2007.10.006

Effect of particle size on magnetic properties of LaMnO_{3 + δ} nanoparticles

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

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

11 Scopus citations

Abstract

Magnetic properties of nanocrystalline LaMnO_{3 + δ} manganites with particle sizes of 20 (LMO20), 25 (LMO25), and 30 nm (LMO30), prepared by the citrate method, have been investigated. All nanoparticles exhibit paramagnetic to ferromagnetic transition (PFT) at T_C > 200 K. It was found that the relative volume of the ferromagnetic phase increases with increasing particle size and approaches a value of about 93% for LMO30. Ac susceptibility of LMO20 sample exhibits strong frequency dependence below T_C, whereas for LMO30 sample only weak frequency dependence was observed. The magnetization of LMO30 sample exhibits a PFT of second order. It was found that an applied pressure enhances T_C of LaMnO_{3 + δ} particles with a pressure coefficient of d T_C / d P ≈ 1.4 - 1.9 K / kbar for all samples. Peculiar magnetic memory and negative magnetization effects observed for LMO20 sample are discussed.

Original language	English
Pages (from-to)	476-482
Number of pages	7
Journal	Superlattices and Microstructures
Volume	44
Issue number	4-5
DOIs	https://doi.org/10.1016/j.spmi.2007.10.006
State	Published - 1 Oct 2008

Keywords

Curie temperature
Nanocrystalline manganites
Particle size
Pressure effects

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.spmi.2007.10.006

Cite this

@article{3f4334440c85405f87faaa9082c84bca,

title = "Effect of particle size on magnetic properties of LaMnO3 + δ nanoparticles",

abstract = "Magnetic properties of nanocrystalline LaMnO3 + δ manganites with particle sizes of 20 (LMO20), 25 (LMO25), and 30 nm (LMO30), prepared by the citrate method, have been investigated. All nanoparticles exhibit paramagnetic to ferromagnetic transition (PFT) at TC > 200 K. It was found that the relative volume of the ferromagnetic phase increases with increasing particle size and approaches a value of about 93% for LMO30. Ac susceptibility of LMO20 sample exhibits strong frequency dependence below TC, whereas for LMO30 sample only weak frequency dependence was observed. The magnetization of LMO30 sample exhibits a PFT of second order. It was found that an applied pressure enhances TC of LaMnO3 + δ particles with a pressure coefficient of d TC / d P ≈ 1.4 - 1.9 K / kbar for all samples. Peculiar magnetic memory and negative magnetization effects observed for LMO20 sample are discussed.",

keywords = "Curie temperature, Nanocrystalline manganites, Particle size, Pressure effects",

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

note = "Funding Information: This work was supported in part by the Polish State Committee for Scientific Research under research project no. 1 P03B 123 30 and by the Network “New materials and sensors for optoelectronics, information technology, energetics and medicine”.",

year = "2008",

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doi = "10.1016/j.spmi.2007.10.006",

language = "English",

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T1 - Effect of particle size on magnetic properties of LaMnO3 + δ nanoparticles

AU - Markovich, V.

AU - Fita, I.

AU - Mogilyansky, D.

AU - Wisniewski, A.

AU - Puzniak, R.

AU - Titelman, L.

AU - Vradman, L.

AU - Herskowitz, M.

AU - Gorodetsky, G.

N1 - Funding Information: This work was supported in part by the Polish State Committee for Scientific Research under research project no. 1 P03B 123 30 and by the Network “New materials and sensors for optoelectronics, information technology, energetics and medicine”.

PY - 2008/10/1

Y1 - 2008/10/1

N2 - Magnetic properties of nanocrystalline LaMnO3 + δ manganites with particle sizes of 20 (LMO20), 25 (LMO25), and 30 nm (LMO30), prepared by the citrate method, have been investigated. All nanoparticles exhibit paramagnetic to ferromagnetic transition (PFT) at TC > 200 K. It was found that the relative volume of the ferromagnetic phase increases with increasing particle size and approaches a value of about 93% for LMO30. Ac susceptibility of LMO20 sample exhibits strong frequency dependence below TC, whereas for LMO30 sample only weak frequency dependence was observed. The magnetization of LMO30 sample exhibits a PFT of second order. It was found that an applied pressure enhances TC of LaMnO3 + δ particles with a pressure coefficient of d TC / d P ≈ 1.4 - 1.9 K / kbar for all samples. Peculiar magnetic memory and negative magnetization effects observed for LMO20 sample are discussed.

AB - Magnetic properties of nanocrystalline LaMnO3 + δ manganites with particle sizes of 20 (LMO20), 25 (LMO25), and 30 nm (LMO30), prepared by the citrate method, have been investigated. All nanoparticles exhibit paramagnetic to ferromagnetic transition (PFT) at TC > 200 K. It was found that the relative volume of the ferromagnetic phase increases with increasing particle size and approaches a value of about 93% for LMO30. Ac susceptibility of LMO20 sample exhibits strong frequency dependence below TC, whereas for LMO30 sample only weak frequency dependence was observed. The magnetization of LMO30 sample exhibits a PFT of second order. It was found that an applied pressure enhances TC of LaMnO3 + δ particles with a pressure coefficient of d TC / d P ≈ 1.4 - 1.9 K / kbar for all samples. Peculiar magnetic memory and negative magnetization effects observed for LMO20 sample are discussed.

KW - Curie temperature

KW - Nanocrystalline manganites

KW - Particle size

KW - Pressure effects

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