Journal Article

Pressure effect on magnetic hysteresis parameters of single-domain magnetite contained in natural plagioclase crystal

Masahiko Sato, Yuhji Yamamoto, Takashi Nishioka, Kazuto Kodama, Nobutatsu Mochizuki, Yoichi Usui and Hideo Tsunakawa

in Geophysical Journal International

Volume 202, issue 1, pages 394-401
ISSN: 0956-540X
Published online May 2015 | e-ISSN: 1365-246X | DOI: http://dx.doi.org/10.1093/gji/ggv154
Pressure effect on magnetic hysteresis parameters of single-domain magnetite contained in natural plagioclase crystal

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This study investigates pressure effects on the magnetic properties of non-interacting single-domain (SD) magnetite. Using a high-pressure cell specially designed for a Magnetic Property Measurement System, magnetic hysteresis measurements were conducted under high pressures of up to 1 GPa on natural plagioclase crystals containing much acicular SD magnetite. Coercivity and saturation magnetization were nearly constant with pressure, while saturation remanent magnetization and coercivity of remanence decreased with pressure at moderate rates of −8 per cent GPa–1 and −18 per cent GPa–1, respectively. These results suggest that temperature effects govern the magnetic behaviour of acicular SD magnetite grains in the middle and lower crusts.

Keywords: Magnetic anomalies: modelling and interpretation; Rock and mineral magnetism; High-pressure behaviour

Journal Article.  5228 words.  Illustrated.

Subjects: Geology and the Lithosphere

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