Comment on papers “Effect of Ag substitution on the transport property and magnetoresistance of LaMnO3” [J. Magn. Magn. Mater. 248 (2002) 26] and “Possible magnetic phase separation in Ru-doped La0.67Ca0.33O3” [J. Magn. Magn. Mater. 257 (2003) 195]

Rozenberg, E.

doi:10.1016/j.jmmm.2003.08.021

Cited by 12 publications

(8 citation statements)

References 14 publications

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“…Such an homegeneous distribution og Ga is in contrast to this compounds doped with Ru transtion metal. It was observed for the Ru doped manganites that the enhanced dopant density at grain boundaries leads to the additional electron scattering processes at grain boundaries [37,38].…”

Section: Discussionmentioning

confidence: 99%

Effect of Ga doping on magneto-transport properties in colossal magnetoresistive La0.7Ca0.3Mn1−xGaxO3 (0<x<0.1)

Pękała

Mucha

Vertruyen

et al. 2006

Journal of Magnetism and Magnetic Materials

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Samples of La 0.7 Ca 0.3 Mn 1Àx Ga x O 3 with x ¼ 0, 0.025, 0.05 and 0.10 were prepared by standard solid-state reaction. They were first characterized chemically, including the microstructure. The magnetic properties and various transport properties, i.e. the electrical resistivity, magnetoresistivity (for a field below 8 T), thermoelectric power and thermal conductivity measured each time on the same sample, are reported. The markedly different behaviour of the x ¼ 0.1 sample from those with a smaller Ga content, is discussed. The dilution of the Mn 3+ /Mn 4+ interactions with Ga doping considerably reduces the ferromagnetic double exchange interaction within the manganese lattice leading to a decrease of the Curie temperature. The polaron binding energy varies from 224 to 243 meV with increased Ga doping. r

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Section: Discussionmentioning

confidence: 99%

Effect of Ga doping on magneto-transport properties in colossal magnetoresistive La0.7Ca0.3Mn1−xGaxO3 (0<x<0.1)

Pękała

Mucha

Vertruyen

et al. 2006

Journal of Magnetism and Magnetic Materials

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“…8 presents the temperature dependence of the magnetization for both FC and ZFC under application of a 100 Oe magnetic field in terms of the temperature dependence of magnetization. The FC-ZFC curve can be used to analyze the blocking phenomenon, which is related to the relationship between the thermal energy and magnetic anisotropy energy [17,34]. If the former is higher than the latter, the magnetic moment remains orientated along the easy axis and emulates ferromagnetism.…”

Section: Magnetization Measurementsmentioning

confidence: 99%

“…Nanosized magnetic materials undergo heat generation via the loss of magnetic relaxation, a unique mechanism exhibited by superparamagnetic particles. Additionally, magnetic relaxation loss can occur via two mechanisms-Brownian relaxation and Néel relaxation-based on nanoparticles rotating in the solvent [17]. These mechanisms depend on particle size, magnetic anisotropy, thermal energy, and solvent viscosity.…”

Section: Introductionmentioning

confidence: 99%

Nanoarchitectonics of PEG-Coated Ni-Zn Ferrite Nanoparticles and Mechanical Analysis of Heat Generation by Magnetic Relaxation

Kodama

Hamada

Nashimoto

et al. 2022

J Inorg Organomet Polym

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The magnetic relaxation of magnetic nanoparticles (MNPs) has been used as a potential heating agent for magnetic hyperthermia treatment (MHT). This requires an understanding of the heating mechanism of MNPs, such as Néel relaxation; however, few studies about magnetic relaxation using a low-frequency AC magnetic field have been reported. This study attempts to clarify the correlation between the dominance of Néel relaxation in low-frequency AC fields and the magnetic properties. Nanoparticles of Ni0.8Zn0.2Fe2O4 coated with poly(ethylene glycol) (PEG) were synthesized in various sizes (d = 12, 15, and 19 nm), and were subjected to structural analysis, PEG modification, and magnetic measurements. The PEG400 coating results in a hydrodynamic diameter ten times smaller than that of our previous sample. The heat generation experiment was conducted on samples suspended in solvents of different viscosities in the presence of an AC field (h = 3.2 kAm -1 , f = 90 kHz). The specific absorption rate (SAR) as a function of the viscosity of the 15-nm NP sample is consistent with the theoretically calculated value in cases where the Néel relaxation is dominant. Therefore, we conclude that the Néel relaxation dominates the heating mechanism of the 15nm sample. Rather than being fully superparamagnetic, this sample was partly superparamagnetic and slightly ferromagnetic, with the dominance of the Néel relaxation to a certain degree affected by spin blocking. Detailed analysis of the magnetic relaxation is crucial to improve the heating efficiency of MNPs for MHT.

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“…Replacing the divalent alkali-earth metals by monovalent elements, such as Na, K and Li, also leads to similar phenomena in manganites. Recently substitution of Ag for La in LaMnO 3 leads to another series of novel oxides exhibiting ferromagnetic metal to paramagnetic insulators transition with high CMR effect at room temperature [4][5][6][7][8][9][10][11][12][13][14][15]. In our paper we study magnetic properties of La 0.90 Ag 0.10 (Co x Mn 1-x )O 3 ferromagnetic ceramics at ambient pressure and high hydrostatic pressure.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of La_0.9Ag_0.1(Mn_1-xCo_x)O₃under Pressure

Antoňák

Arnold

Kamarád

et al. 2013

EPJ Web of Conferences

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Abstract. In our paper we report on magnetic properties of La 0.90 Ag 0.10 (Co x Mn 1-x )O 3 ferromagnetic ceramics (x = 0.00 and0.03) which were studied in pressures up to 0.9 GPa. Magnetic transition at the Curie temperature T C is accompanied with metal insulator transition with a maximum at T* which is shifted to lower temperature with applied magnetic field. The Curie temperature is decreasing with substitution of Co for Mn and is ranging from 178 K to 126.5 K. Hydrostatic pressure increases T C for sample with x = 0.03 nearly linearly with the pressure coefficient dT c /dp = 5.7 K/GPa. Hysteresis loop is affected marginally; µ s increases and H c decreases with pressure.

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Comment on papers “Effect of Ag substitution on the transport property and magnetoresistance of LaMnO3” [J. Magn. Magn. Mater. 248 (2002) 26] and “Possible magnetic phase separation in Ru-doped La0.67Ca0.33O3” [J. Magn. Magn. Mater. 257 (2003) 195]

Cited by 12 publications

References 14 publications

Effect of Ga doping on magneto-transport properties in colossal magnetoresistive La0.7Ca0.3Mn1−xGaxO3 (0<x<0.1)

Effect of Ga doping on magneto-transport properties in colossal magnetoresistive La0.7Ca0.3Mn1−xGaxO3 (0<x<0.1)

Nanoarchitectonics of PEG-Coated Ni-Zn Ferrite Nanoparticles and Mechanical Analysis of Heat Generation by Magnetic Relaxation

Magnetic Properties of La_0.9Ag_0.1(Mn_1-xCo_x)O₃under Pressure

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Comment on papers “Effect of Ag substitution on the transport property and magnetoresistance of LaMnO3” [J. Magn. Magn. Mater. 248 (2002) 26] and “Possible magnetic phase separation in Ru-doped La0.67Ca0.33O3” [J. Magn. Magn. Mater. 257 (2003) 195]

Cited by 12 publications

References 14 publications

Effect of Ga doping on magneto-transport properties in colossal magnetoresistive La0.7Ca0.3Mn1−xGaxO3 (0<x<0.1)

Effect of Ga doping on magneto-transport properties in colossal magnetoresistive La0.7Ca0.3Mn1−xGaxO3 (0<x<0.1)

Nanoarchitectonics of PEG-Coated Ni-Zn Ferrite Nanoparticles and Mechanical Analysis of Heat Generation by Magnetic Relaxation

Magnetic Properties of La0.9Ag0.1(Mn1-xCox)O3under Pressure

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Magnetic Properties of La_0.9Ag_0.1(Mn_1-xCo_x)O₃under Pressure