Low-temperature magnetic properties of the Neuschwanstein EL6 meteorite

Kohout, T.; Kosterov, Andrei; Jackson, Michael J.; Pesonen, L. J.; Kletetschka, Günther; Lehtinen, M.

doi:10.1016/j.epsl.2007.06.022

Cited by 16 publications

(31 citation statements)

References 19 publications

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“…Some of them undergo magnetic transitions at low temperatures making them, together with metallic FeNi, an important magnetic phase [Kohout et al, 2010]. In this work, we present new data on the low temperature magnetic properties, zero-field and in-field Mössbauer study of troilite below and above a magnetic transition taking place at ≈70 K, first reported by Kohout et al [2007].…”

Section: Introductionmentioning

confidence: 67%

“…[8] The FeS_Bruderheim troilite sample, identical with the sample used in earlier studies [Kohout et al, 2007[Kohout et al, , 2010, is a powdered troilite extract from a Bruderheim L6 chondrite. The Bruderheim meteorite fall occurred in Alberta, Canada, on March 4, 1960, and subsequently over 300 kg of the meteorite were recovered.…”

Section: Methodsmentioning

confidence: 99%

“…[23] In order to confirm or exclude the Morin-type spin reorientation phenomenon in the FeS troilite at ≈70 K as suggested by Kohout et al [2007], we monitored a temperature evolution of the zero-field quadruple splitting parameter (DE Q ) when passing through ≈70 K (see Table 2). If the Morin-like transition takes place, changes in the DE Q -value would be observed due to the spin reorientation.…”

Section: Zero-field Mössbauer Spectroscopy Of the Fes_cape_york Samplementioning

confidence: 99%

“…[4] The low temperature magnetic study by Kohout et al [2007], performed on a powdered fraction extracted from the Bruderheim L6 chondrite, revealed an existence of the magnetic transition at ≈70 K in troilite. However, the nature of this transition has not been addressed in details.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, we re-investigated troilite from the Bruderheim L6 chondrite with experimental techniques not used in the previous study by Kohout et al [2007] (new data acquired on the Bruderheim troilite are presented in the auxiliary material).…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature magnetic transition in troilite: A simple marker for highly stoichiometric FeS systems

et al. 2011

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[1] Low-temperature magnetic evolution of troilite sample, extracted from the Cape York IIIA octahedrite meteorite, was investigated by employing macroscopic magnetic measurement, Mössbauer spectroscopy, scanning electron microscopy (SEM) and backscattered electrons (BSE) microscopy, X-ray diffraction (XRD), electron microprobe analysis (EMA), and atomic absorption spectrometry (AAS). The study identified a magnetic transition at ≈70 K manifested itself in a similar manner as previously reported for troilite from the Bruderheim L6 chondrite meteorite. The data show that this transition is unlikely driven by impurity such as chromite and seems to be rather an intrinsic property of troilite. In this study, we unambiguously exclude the relation of this transition to the structural rearrangement like the Morin transition in hematite. Similarly, in-field Mössbauer data do not support the change of the canting angle in the spin structure of FeS above and below the transition. Mössbauer, XRD, and magnetic data, newly measured also for troilite from the Bruderheim L6 chondrite, demonstrate that both studied troilite samples exhibit nearly the same magnetic and structural characteristics. Thus, the nature of the transition occurring at ≈70 K in both samples has identical characteristics and its detection can be used as a simple general marker for highly stoichiometric FeS systems.Citation: Cuda, J., T. Kohout, J. Tucek, J. Haloda, J. Filip, R. Prucek, and R. Zboril (2011), Low-temperature magnetic transition in troilite: A simple marker for highly stoichiometric FeS systems,

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Section: Introductionmentioning

confidence: 67%

Section: Methodsmentioning

confidence: 99%

Section: Zero-field Mössbauer Spectroscopy Of the Fes_cape_york Samplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-temperature magnetic transition in troilite: A simple marker for highly stoichiometric FeS systems

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Magnetic mineralogy of the Mercurian lithosphere

2016

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Mercury and Earth are the only inner solar system planets with active, internally generated dynamo magnetic fields. The MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission recently detected magnetic fields on Mercury that are consistent with lithospheric magnetization. We investigate the physical and chemical environment of Mercury's lithosphere, past and present, to establish the conditions under which magnetization may have been acquired and modified. Three factors are particularly crucial to the determination of crustal composition and iron mineralogy: redox conditions in the planet's crust and mantle, the iron content of the lithosphere, and, for any remanent magnetization, the temperature profile of the lithosphere and its evolution over time. We explore potential mechanisms for remanence acquisition and alteration on Mercury, whose surface environment is both hot and highly reducing. The long‐term thermal history of Mercury's crust plays an important role in the longevity of any remanent crustal magnetization, which may be subject to remagnetization through thermal, viscous, and shock mechanisms. This thermal and compositional framework is used both to constrain plausible candidate minerals that could carry magnetic remanence on Mercury and to evaluate their capacity to acquire and retain sufficient magnetization to be detectable from satellite orbit. We propose that iron metal and its alloys are likely to be the dominant contributors to induced and remanent magnetization in Mercury's lithosphere, with additional contributions from iron silicides, sulfides, and carbides.

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Low-temperature magnetic properties of iron-bearing sulfides and their contribution to magnetism of cometary bodies

Kohout

Kosterov

Haloda

et al. 2010

Icarus

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Please cite this article as: Kohout, T., Kosterov, A., Haloda, J., Týcová, P., Zbořil, R., Low-temperature magnetic properties of iron-bearing sulfides and their contribution to magnetism of cometary bodies, Icarus (2010), AbstractIn this study we present a review of low-temperature magnetic properties of alabandite (Fe,Mn)S, daubreelite FeCr 2 S 4 pyrrhotite Fe 1-x S and troilite FeS updated with new experimental data. The results indicate that besides FeNi alloys mainly daubreelite with its Curie temperature T C ~150 K and strong induced and remanent magnetizations may be a significant magnetic mineral in cold environments and may complement that of FeNi or even dominate magnetic properties of sulfide rich bodies at temperatures below T C .Comets are known to contain iron bearing sulfides within dusty fraction and their surfaces are subject to temperature variations in the range of 100-200 K down to the depth of several meters while the cometary interior is thermally stable at several tens of Kelvin which is within the temperature range where alabandite, daubreelite or troilite are "magnetic". Thus not only FeNi alloys, but also sulfides have to be considered in the interpretation of magnetic data from cometary objects such as will be delivered by Rosetta mission. Modeling indicates that magnetic interactions between cometary nucleus containing iron-bearing sulfides and interplanetary magnetic field would be difficult, but not impossible, to detect from orbit.Rosetta's Philae lander present on the surface would provide more reliable signal.

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Low-temperature magnetic properties of the Neuschwanstein EL6 meteorite

Cited by 16 publications

References 19 publications

Low-temperature magnetic transition in troilite: A simple marker for highly stoichiometric FeS systems

Low-temperature magnetic transition in troilite: A simple marker for highly stoichiometric FeS systems

Magnetic mineralogy of the Mercurian lithosphere

Low-temperature magnetic properties of iron-bearing sulfides and their contribution to magnetism of cometary bodies

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