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A new method in mineral magnetism for the separation of weak antiferromagnetic signal from a strong ferrimagnetic background
Author(s) -
Liu Qingsong,
Banerjee Subir K.,
Jackson Michael J.,
Zhu Rixiang,
Pan Yongxin
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl014699
Subject(s) - remanence , magnetite , demagnetizing field , ferrimagnetism , rock magnetism , magnetometer , magnetism , hematite , materials science , condensed matter physics , maghemite , nuclear magnetic resonance , magnetization , geology , mineralogy , physics , magnetic field , quantum mechanics , metallurgy
This paper describes a new magnetic method for determining the contribution of weakly magnetic hematite against a strongly magnetic (e.g. magnetite) background. The method involves measurements of M fr , a residual or “final” remanence after hysteretic demagnetization of saturated isothermal remanent magnetization. In terms of sensitivity and precision, our proposed method is superior to the currently popular approach known as the HIRM method. Compared to the latter, M fr has no error amplification caused by subtraction of terms. The method utilizes the available software for hysteretic demagnetization function on an automated vibrating sample magnetometer (VSM). This, in turn, automatically decreases some of the disturbing effects of the strong magnetic background, e.g., magnetic viscosity, initially non‐zero offset of HIRM for partially oxidized magnetite, etc.