A pulsed field technique for the study of magnetic grains in rocks

Radhakrishnamurty, C.; Likhite, S.D.

doi:10.1016/0031-9201(87)90188-9

Cited by 3 publications

(2 citation statements)

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“…The IRM unmixing analysis has become a conventional tool for the quantitative characterization of magnetic minerals (Kruiver et al 2001;Heslop et al 2002;Egli 2004;Abrajevitch and Kodama 2011). However, the measurement of dynamic magnetizations in pulsed fields has been paid little attention except the pioneering work by Radhakrishnamurthy and Likhite (1987) who obtained hysteresis parameters from a set of synthetic and basalt samples using a laboratory-made PFM system (Likhite et al 1985). They compared the results both at room and low temperature (77 K), suggesting that the latter provided a better estimate of the composition and domain state.…”

Section: Introductionmentioning

confidence: 99%

“…This study is an attempt to improve the previous system (Kodama 2015) by increasing the sensitivity sufficiently to measure a wide spectrum of igneous rocks containing titanomagnetite or other magnetic minerals with high saturation magnetization (M s ). Based on the results from the earlier works (Radhakrishnamurthy and Likhite 1987;Kodama 2015), an improved system with approximately 1 order of magnitude better sensitivity was developed. This system was tested to a set of igneous rocks with the magnetic properties well-documented by previous works.…”

Section: Introductionmentioning

confidence: 99%

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Pulsed-field magnetometry for rock magnetism

Kodama

2015

Earth Planet Sp

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An improved method is proposed for measuring dynamic magnetizations of bulk volcanic rock samples induced by a pulsed-field of 0.7 T and a duration of 10 ms. The transient magnetization is measured by a sensing system that consists of a pair of inductive differential coils, an analog preamplifier and integrator, and a high-speed digital storage scope. The system was calibrated using a paramagnetic salt (Gd 2 O 3 ) and was tested to different kinds of volcanic rocks with their magnetic properties well-documented previously. The results were comparable with those measured by a quasi-static method using a vibrating sample magnetometer, although there were small discrepancies in hysteresis parameters suggesting the time-dependence of the magnetic properties. The proposed system provides not only the magnetization over the short interval of a pulse but also the rapid (~3 ms) exponential decay after a pulse. The decay time constant was different among the samples under study, indicating the variations of their magnetic relaxation time. Although the present system is not sensitive enough to characterize varieties of natural samples including sediments, it has the potential as a versatile and convenient tool for rock magnetism.

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