Magnetic Clusters in Natural Ferro-Chromian Spinels

Tatyana Sherendo; Valentin Mitrofanov; Aleksey Vdovin; Petr Martyshko; Aleksey Alexeev; Dmitry Zamyatin; Vladimir Vazhenin; Lidia Pamyatnykh

doi:10.4028/www.scientific.net/SSP.233-234.587

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HomeSolid State PhenomenaSolid State Phenomena Vols. 233-234Magnetic Clusters in Natural Ferro-Chromian...

Magnetic Clusters in Natural Ferro-Chromian Spinels

Abstract:

The results of investigations of natural iron-chromium spinels of variable composition Fe²⁺(Cr_2-xFe_x³⁺)O₄ of the chromite-bearing Klyuchevskoi massif (Middle Urals), which are the main carriers of the magnetization of rocks are presented. Substantial changes in the composition and in magnetic structure of accessory chrome-spinels scattered in the host rock are established, unlike the almost unaltered ore-forming chrome-spinels, under the influence of secondary geological processes. To establish the connection between the chrome-spinel changes at the microlevel and features of the geomagnetic field anomalies created by this carrier of magnetization of rocks, it is carried out a complex of investigations of Fe-Cr-spinels (thermomagnetic analysis over the temperature range (4÷1000) K; magnetic resonance (MR) spectroscopy and magnetic force microscopy (MFM) in addition to magnetomineralogical studies). As a result, in the relict areas of grains of the accessory chrome-spinels were first discovered the magnetic clusters (superparamagnetic phases) in the form of single or groups of 2 – 3 magnetic dipoles of tens nanometers in size, or in the form of chain-like structures of magnetic dipoles/single domains.

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Periodical:

Solid State Phenomena (Volumes 233-234)

Pages:

587-590

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.233-234.587

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Online since:

July 2015

Authors:

Tatyana Sherendo, Valentin Mitrofanov, Aleksey Vdovin, Petr Martyshko, Aleksey Alexeev, Dmitry Zamyatin, Vladimir Vazhenin, Lidia Pamyatnykh*

Keywords:

Magnetic Cluster, Magnetization Carrier, Natural Fe-Cr-Spinel, Superparamagnetism

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