Critical RF losses in fine particles of La1-xAgyMnO3+δ: Prospects for temperature-controlled hyperthermia

V. A. Atsarkin; A. A. Generalov; V. V. Demidov; A. E. Mefed; M. N. Markelova; O. Yu Gorbenko; A. R. Kaul; E. J. Roy; B. M. Odintsov

doi:10.1016/j.jmmm.2009.05.043

Critical RF losses in fine particles of La_1-xAg_yMnO_3+δ: Prospects for temperature-controlled hyperthermia

V. A. Atsarkin, A. A. Generalov, V. V. Demidov, A. E. Mefed, M. N. Markelova, O. Yu Gorbenko, A. R. Kaul, E. J. Roy, B. M. Odintsov

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

Abstract

Temperature and frequency dependencies of the real (χ′) and imaginary (χ″) parts of the dynamic magnetic susceptibility were studied experimentally in fine particles of La-Ag manganites prepared by various methods. The samples under study have the Curie points in the range T_C=42-48 °C, which is a medical hyperthermia range of interest. When approaching T_C from below, a critical peak of χ″ was revealed, followed by a steep drop while passing to the paramagnetic phase. The experiments on the magnetic radio-frequency (RF) heating of the manganite aqueous suspensions demonstrated good autostabilization of the temperature near T_C. Peculiar instability is found in the heating kinetics, caused by the observed critical behavior of the RF losses. The prospects of the La-Ag manganites as candidates for application in the temperature-controlled hyperthermia are discussed.

Original language	English (US)
Pages (from-to)	3198-3202
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	321
Issue number	19
DOIs	https://doi.org/10.1016/j.jmmm.2009.05.043
State	Published - Oct 2009

Keywords

Curie point
Dynamic susceptibility
Magnetic hyperthermia
Magnetic nanoparticle
Manganite
Temperature stabilization

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Online availability

10.1016/j.jmmm.2009.05.043

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Cite this

@article{7163457ed50248a49bd6cd0f6a0abf0b,

title = "Critical RF losses in fine particles of La1-xAgyMnO3+δ: Prospects for temperature-controlled hyperthermia",

abstract = "Temperature and frequency dependencies of the real (χ′) and imaginary (χ″) parts of the dynamic magnetic susceptibility were studied experimentally in fine particles of La-Ag manganites prepared by various methods. The samples under study have the Curie points in the range TC=42-48 °C, which is a medical hyperthermia range of interest. When approaching TC from below, a critical peak of χ″ was revealed, followed by a steep drop while passing to the paramagnetic phase. The experiments on the magnetic radio-frequency (RF) heating of the manganite aqueous suspensions demonstrated good autostabilization of the temperature near TC. Peculiar instability is found in the heating kinetics, caused by the observed critical behavior of the RF losses. The prospects of the La-Ag manganites as candidates for application in the temperature-controlled hyperthermia are discussed.",

keywords = "Curie point, Dynamic susceptibility, Magnetic hyperthermia, Magnetic nanoparticle, Manganite, Temperature stabilization",

author = "Atsarkin, {V. A.} and Generalov, {A. A.} and Demidov, {V. V.} and Mefed, {A. E.} and Markelova, {M. N.} and Gorbenko, {O. Yu} and Kaul, {A. R.} and Roy, {E. J.} and Odintsov, {B. M.}",

note = "Funding Information: The work is supported by the HFSP (Grant RGP0047/2007-C) and the Russian Foundation for Basic Research (Grants 08-02-00040, 07-03-01019a). The authors thank V.S. Posvyanskiy for the help in computer modelling calculation.",

year = "2009",

month = oct,

doi = "10.1016/j.jmmm.2009.05.043",

language = "English (US)",

volume = "321",

pages = "3198--3202",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

number = "19",

}

TY - JOUR

T1 - Critical RF losses in fine particles of La1-xAgyMnO3+δ

T2 - Prospects for temperature-controlled hyperthermia

AU - Atsarkin, V. A.

AU - Generalov, A. A.

AU - Demidov, V. V.

AU - Mefed, A. E.

AU - Markelova, M. N.

AU - Gorbenko, O. Yu

AU - Kaul, A. R.

AU - Roy, E. J.

AU - Odintsov, B. M.

N1 - Funding Information: The work is supported by the HFSP (Grant RGP0047/2007-C) and the Russian Foundation for Basic Research (Grants 08-02-00040, 07-03-01019a). The authors thank V.S. Posvyanskiy for the help in computer modelling calculation.

PY - 2009/10

Y1 - 2009/10

N2 - Temperature and frequency dependencies of the real (χ′) and imaginary (χ″) parts of the dynamic magnetic susceptibility were studied experimentally in fine particles of La-Ag manganites prepared by various methods. The samples under study have the Curie points in the range TC=42-48 °C, which is a medical hyperthermia range of interest. When approaching TC from below, a critical peak of χ″ was revealed, followed by a steep drop while passing to the paramagnetic phase. The experiments on the magnetic radio-frequency (RF) heating of the manganite aqueous suspensions demonstrated good autostabilization of the temperature near TC. Peculiar instability is found in the heating kinetics, caused by the observed critical behavior of the RF losses. The prospects of the La-Ag manganites as candidates for application in the temperature-controlled hyperthermia are discussed.

AB - Temperature and frequency dependencies of the real (χ′) and imaginary (χ″) parts of the dynamic magnetic susceptibility were studied experimentally in fine particles of La-Ag manganites prepared by various methods. The samples under study have the Curie points in the range TC=42-48 °C, which is a medical hyperthermia range of interest. When approaching TC from below, a critical peak of χ″ was revealed, followed by a steep drop while passing to the paramagnetic phase. The experiments on the magnetic radio-frequency (RF) heating of the manganite aqueous suspensions demonstrated good autostabilization of the temperature near TC. Peculiar instability is found in the heating kinetics, caused by the observed critical behavior of the RF losses. The prospects of the La-Ag manganites as candidates for application in the temperature-controlled hyperthermia are discussed.

KW - Curie point

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KW - Temperature stabilization

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