Magnetic hysteresis of pseudo-single-domain and multidomain magnetite below the Verwey transition

Kosterov, Andrei

doi:10.1016/s0012-821x(01)00250-3

Cited by 41 publications

(73 citation statements)

References 39 publications

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“…Within a ferroelastic domain, the direction of c-axis is constant. Twinning appears to play an important role in determining magnetic properties of magnetite below T V (e.g., Özdemir and Dunlop, 1999;Kosterov, 2001;Smirnov and Tarduno, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…It has been long known that magnetic properties of magnetite below T V are controlled by the strength of a magnetic field applied during cooling through the transition (e.g., Li, 1932;Bickford, 1950;Williams et al, 1953;Schmidbauer and Keller, 1996;Kosterov, 2001;Smirnov, 2006). The character of this control, however, depends on magnetic domain state (and, hence, on the grain size and shape) of magnetite (e.g., Kosterov, 2001;Smirnov and Tarduno, 2002;Carter-Stiglitz et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Grain size dependence of low-temperature remanent magnetization in natural and synthetic magnetite: Experimental study

Смирнов

2009

Earth Planet Sp

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Magnetic measurements at cryogenic temperatures (<300 K) proved to be useful in paleomagnetic and rock magnetic research, stimulating continuous interest to low-temperature properties of magnetite and other magnetic minerals. Here I report new experimental results on a grain size dependence of the ratio (R LT ) between a lowtemperature (20 K) saturation isothermal remanent magnetization (SIRM) imparted in magnetite after cooling in a 2.5 T field (field cooling, FC) and in a zero field environment (zero field cooling, ZFC). Synthetic magnetite samples ranged in mean grain size from 0.15 to 100 μm, representing nearly single-domain (SD), pseudosingledomain (PSD), and multidomain (MD) magnetic states. The R LT ratio monotonically increases from 0.58 to 1.12 with the decreasing mean grain size, being close to unity for PSD grains (0.15-5 μm) and smaller than unity for MD magnetite (12-100 μm). The R LT ratio of 1.27 is observed for acicular magnetite characterized by nearly SD behavior. These observations indicate that within the range of ∼0.15 to ∼5 μm, the low-temperature SIRM may be higher than that expected from "normal" magnetic domain wall displacement. Such a behavior can be caused by the presence of a SD-like component in the magnetization of these grains, which origin, however, is uncertain. The natural rocks containing nearly stoichiometric magnetite manifest a dependence of the R LT ratio on magnetic domain state identical to that observed from synthetic magnetites. Therefore, the comparison of FC SIRM and ZFC SIRM at very low temperatures may allow a crude estimate of magnetic domain state in some magnetite-bearing rocks, such as shallow mafic intrusions or some marine sediments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grain size dependence of low-temperature remanent magnetization in natural and synthetic magnetite: Experimental study

Смирнов

2009

Earth Planet Sp

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“…It is known that upon cooling below T v ≈ 120 K magnetite undergoes a sharp first-order metal-insulator transition (so-called Verwey transition) at which heat capacity has anomalous behavior, the resistivity increases sharply by two orders of magnitude [1] and transformation from cubic to monoclinic structure appears [2]. The results from measurements of remanence and coercive force measured in the monoclinic phase (below T v ) for fine grained magnetites with medium particle sizes of 0.037, 0.10 and 0.22 µm have showed that coercive force H c and remanence magnetization increase on cooling through T v in submicron magnetite particles [3].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Bacterial Nanoparticles

et al. 2009

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The objective of this study is to prepare and study magnetic properties of biological magnetic nanoparticles (magnetosomes) as a product of biomineralization process of magnetotactic bacteria Magnetospirillum sp. AMB-1. From temperature dependence of remanent magnetization and coercive field the Verwey transition is clearly seen at 105 K as a consequence of the large anisotropy along the chains of magnetosomes.

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“…Estos valores están dentro de lo reportado, pero no se puede asegurar una tendencia clara de disminución o aumento de dicha temperatura de transición a medida que se aumenta el % CuO, indicando cierto grado de insensibilidad [6].…”

Section: Resultados Y Discusiónunclassified

“…La transición de Verwey es explicada como el ordenamiento en los sitios octaédricos de los cationes F e 2+ y F e 3+ por debajo de dicha temperatura; sin embargo, actualmente se continúan realizando estudios en la materia para explicar en detalle el mecanismo [2][3][4][5]. Más concretamente, dependiendo de la estequiometría, se ha reportado que la temperatura de transición ocurre en el rango 119 -124 K, y que tanto vacancias como impurezas tienen el efecto de disminuir la temperatura de la transición [6].…”

Section: +unclassified

CARACTERIZACIÓN MAGNÉTICA E HIPERFINA DE LA TRANSFORMACIÓN TÉRMICA CuO - Fe2O3 A Fe3O4

Betancur¹,

Restrepo²,

Fernández³

et al. 2018

Momento

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ResumenSe presenta un estudio magnético acerca de la transformación térmica de hematita dopada con CuO (F e 2 O 3 + CuO). El tratamiento térmico se realizó a una temperatura de 375±1 o C, en una atmósfera controlada compuesta por 20 % de hidrógeno y 80 % de nitrógeno. Las muestras fueron caracterizadas por espectroscopía Mössbauer a temperatura ambiente, magnetización en función de la temperatura y ciclos de histéresis a 10K. Los resultados sugieren que los campos hiperfinos y los anchos de línea A y B permanecen esencialmente constantes con el aumento de la concentración de CuO, mientras que a la vez surge una componente paramagnética, lo cual es indicativo de la aparición de un precipitado o nueva fase de F e − Cu, i.e. no hay una incorporación efectiva del cobre en la estructura de la magnetita. La magnetización de saturación cae aproximadamente de 87 emu/g a 78 emu/g, consistente con la presencia de dicha fase paramagnética.

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Magnetic hysteresis of pseudo-single-domain and multidomain magnetite below the Verwey transition

Cited by 41 publications

References 39 publications

Grain size dependence of low-temperature remanent magnetization in natural and synthetic magnetite: Experimental study

Grain size dependence of low-temperature remanent magnetization in natural and synthetic magnetite: Experimental study

Magnetic Properties of Bacterial Nanoparticles

CARACTERIZACIÓN MAGNÉTICA E HIPERFINA DE LA TRANSFORMACIÓN TÉRMICA CuO - Fe2O3 A Fe3O4

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