Magnetic properties of marine tertiary tephra investigated over a wide temperature range

We report on a detailed investigation of the magnetic properties of tertiary tephra as a function of temperature and magnetic field, over a wide temperature. The tertiary tephra were chosen from two marine sites in the South Indian Ocean. The measurements were made using the electron spin resonance...

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Veröffentlicht in:	Journal of magnetism and magnetic materials 2005, Vol.293 (2), p.816-825
Hauptverfasser:	Ananou, B., Baronnet, A., Ksari, Y., Marfaing, J., Regnier, S., Rochette, P., Sulpice, A., Stepanov, A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Electron microscopy Electron paramagnetic resonance and relaxation ESR technique Exact sciences and technology Magnetic properties Magnetic properties and materials Magnetic resonances and relaxations in condensed matter, mössbauer effect Marine tephra Physics Studies of specific magnetic materials Temperature
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Zusammenfassung:	We report on a detailed investigation of the magnetic properties of tertiary tephra as a function of temperature and magnetic field, over a wide temperature. The tertiary tephra were chosen from two marine sites in the South Indian Ocean. The measurements were made using the electron spin resonance (ESR) technique in the temperature range 4–1100 K and a SQUID magnetometer at temperatures from 4 to 300 K. We show that the magnetic properties of the studied ashes are mainly due to two contributions, a ferrimagnetic one and a paramagnetic one. At moderate magnetic fields, B
ISSN:	0304-8853 1873-4766
DOI:	10.1016/j.jmmm.2004.12.002