Magnetic Properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and the Canted Spin Problem

Dwight, K.; Menyuk, N.

doi:10.1103/physrev.119.1470

Cited by 291 publications

(136 citation statements)

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“…A comparison of the FM component of magnetization in our sample with 3 at.% Mn obtained from the M (H) data at 30 K (not shown), where it was possible to subtract the linear component from the total magnetization, with the literature data [14,15] …”

Section: Resultsmentioning

confidence: 99%

“…6) exhibits a maximum and a minimum at the positions (38.4 ± 0.5) K and (43.0 ± 0.5) K respectively and these characteristic temperatures were recorded within the limit of accuracy in measurements for all applied magnetic fields. The position of the minimum at 43 K corresponds to the Curie temperature of the bulk tetragonal Mn 3 O 4 , T C(bulk) = 42 K [14], as well as of Mn 3 O 4 nanoparticles of different sizes where the Curie temperature was found to vary from 40.5 K up to 44.3 K [15][16][17]. The first derivative ∂(M T )/∂T for the 0.7 at.% Mn sample measured at 1000 Oe (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Magnetic Properties of Mn-Doped Amorphous SiO₂Matrix

et al. 2011

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Samples of Mn-doped amorphous SiO 2 matrix with manganese concentration 0.7 and 3 at.% have been prepared by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10 -20 nm in size. Two types of Mn-rich particles are dispersed in silica matrix, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High-temperature magnetic susceptibility reveals that dominant magnetic phase at higher temperatures is λ-MnO 2 . At temperatures below T C = 43 K strong ferrimagnetism originating from the minor Mn 3 O 4 phase masks the relatively weak magnetism of λ-MnO 2 . Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the AC magnetic susceptibility in the sample with 3 at.% Mn suggest that the magnetic moments of the smaller Mn 3 O 4 nanoparticles with dimensions below 10 nm are subject to thermally activated blocking process just below the Curie temperature T C . The low-temperature maximum in the zero-field-cooled magnetization observed for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments in the geometrically frustrated Mn sublattice of the λ-MnO 2 crystal structure.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Magnetic Properties of Mn-Doped Amorphous SiO₂Matrix

et al. 2011

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“…2͑a͒, together with the thermal conductivities of pure LCMO ͑S1͒ and pure Mn 3 O 4 ͑S5͒. These ͑T͒ data need to be compared to magnetic phase transition temperatures: Mn 3 O 4 exhibits a ferrimagnetic-paramagnetic transition at ϳ42 K, 15 whereas the LCMO phase exhibits a ferromagnetic-paramagnetic transition at some Curie temperature T C around 250 K, depending on the exact stoichiometry. The Curie temperatures of the LCMO phase in the different samples, determined from magnetic measurements, 11 are indicated by arrows in Fig.…”

Section: Methods Of Thermal Conductivity Measurement and Its Resultsmentioning

confidence: 99%

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Mucha

Vertruyen

Misiorek

et al. 2009

Journal of Applied Physics

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We report the temperature dependence of the thermal conductivity ͑T͒ of bulk polycrystalline composite samples containing a magnetoresistive manganite ͑La 0.7 Ca 0.3 MnO 3 ͒ and an electrically insulating phase ͑Mn 3 O 4 ͒. The sample porosity is shown to be a significant parameter affecting the experimental data: after porosity correction the curves display the characteristics of an ideal composite. A fit of the ͑T͒ curves at low temperature using the Debye model enables the mean free path of phonons scattered on "boundaries" to be determined. The values are on the order of the grain size but are influenced by the grain arrangement and the presence of twins.

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“…Therefore, as the intra-and inter-sublattice interactions are comparable, the collinear magnetic structure of Mn 3 O 4 is destabilized (4). Magnetic studies on powder sample (5) and on single crystal (6) showed that the magnetic ordering below T C ~ 42 K is not collinear or Néel type, but it consists of a canted arrangement of Yafet-Kittel type, discussed in detail by Lotgering (7). Later, the magnetic structure of Mn 3 O 4 has been determined by Jensen and Nielsen using neutron diffraction (8).…”

Section: Introductionmentioning

confidence: 99%

Propiedades magnéticas del sistema espinela MgxMn3-xO4 (0 â¤ x â¤ 2)

Mehdaoui¹,

Peña²,

Bahout³

et al. 2008

Bol. Soc. Esp. Ceram. Vidr.

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Temperature-dependent studies of the low-field magnetization of the polycrystalline spinel oxide Mg x Mn 3-x O 4 (0 ≤ x ≤ 2) are reported. With the use of Lotgering's model, which is equivalent to the Néel's two-sublattice model, a set of molecular field constants λ AB , λ BB and λ AA , has been obtained for 0 ≤ x ≤ 0.4 from the fit of χ between T C and room temperature. Moreover, this model fits consistently the low-temperature canted-spin angles ψ of the B-sublattice. The Curie temperatures T C , as well as the exchange parameters J AB , J BB and J AA , show that the BB interactions are much greater than AA and AB, which are of the same order, in contrast to the situation usually found in magnetic spinels. As the concentration of the non-magnetic ion Mg 2+ increases at the tetrahedral site (A), T C decreases from 42K (for x = 0) while the ferromagnetic behaviour diminishes at the expense of a magnetic frustration, thus highlighting the great influence of the non-magnetic ions located at the A and B-sites on the magnetic order. Se presentan estudios de la variación térmica de la magnetización a bajo campo de espinelas policristalinas de la solución sólida Mg x Mn 3-x O 4 (0 ≤ x ≤ 2). Con la utilización del modelo de Lotgering, que equivale al modelo de Néel de dos subredes, se ha obtenido un conjunto de constantes de campo molecular λ AB , λ BB y λ AA , para 0 ≤ x ≤ 0.4 a partir del ajuste de χ entre T C y temperatura ambiente. Además, este modelo ajusta consistentemente los ángulos ψ de espín canteado de la subred B a baja temperatura. La temperatura de Curie T C , así como los parámetros de canje J AB , J BB and J AA , muestran que las interacciones BB son mucho mayores que las AA y AB que son ambas del mismo orden, en contraste con lo hallado usualmente en espinelas magnéticas. Cuando la concentración del ión no-magnético Mg 2+, aumenta en los lugares tetraédricos, T C decrece desde 42 K (para x = 0), mientras que el comportamiento ferromagnético se debilita a expensas de una frustración magnética, resaltando así la gran influencia de los iones no-magnéticos localizados en lugares A y B, sobre el orden magnético Palabras clave: estructura Yafet-Kittel, modelo de Lotgering, dilución magnética, frustración, vidrio de espín.

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Magnetic Properties ofMn3O4and the Canted Spin Problem

Cited by 291 publications

References 16 publications

Magnetic Properties of Mn-Doped Amorphous SiO₂Matrix

Magnetic Properties of Mn-Doped Amorphous SiO₂Matrix

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Propiedades magnéticas del sistema espinela Mg<sub>x</sub>Mn<sub>3-x</sub>O<sub>4</sub> (0 â¤ x â¤ 2)

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Magnetic Properties ofMn3O4and the Canted Spin Problem

Cited by 291 publications

References 16 publications

Magnetic Properties of Mn-Doped Amorphous SiO2Matrix

Magnetic Properties of Mn-Doped Amorphous SiO2Matrix

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Propiedades magnéticas del sistema espinela Mg<sub>x</sub>Mn<sub>3-x</sub>O<sub>4</sub> (0 â¤ x â¤ 2)

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Magnetic Properties of Mn-Doped Amorphous SiO₂Matrix

Magnetic Properties of Mn-Doped Amorphous SiO₂Matrix

Propiedades magnéticas del sistema espinela Mg<sub>x</sub>Mn<sub>3-x</sub>O<sub>4</sub> (0 â¤ x â¤ 2)