A Preisach method for estimating absolute paleofield intensity under the constraint of using only isothermal measurements: 1. Theoretical framework

Muxworthy, Adrian R.; Heslop, David

doi:10.1029/2010jb007843

Cited by 25 publications

(63 citation statements)

References 61 publications

(122 reference statements)

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“…The approach demonstrated in Figure from remFORC diagrams can assist with assessing this important factor. Similarly, our new types of FORC diagram may be useful for the FORC‐based paleointensity method [ Muxworthy and Heslop , ; Muxworthy et al , ]. The FORC paleointensity method uses zone 3 of a conventional FORC diagram to simulate remanence recording ability by assuming that the FORC distribution approximates a Preisach distribution.…”

Section: Discussionmentioning

confidence: 99%

Magnetic domain state diagnosis using hysteresis reversal curves

et al. 2017

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We present results for a series of hysteresis measurements that provide information about remanent, induced, transient‐free, and transient magnetization components. These measurements, and differences between measurement types, enable production of six types of first‐order reversal curve (FORC)‐like diagrams which only double the number of measurements involved in a conventional FORC measurement. These diagrams can be used to distinguish magnetic signatures associated with each domain state. When analyzing samples with complex magnetic mineral mixtures, the contrasting domain state signatures are mixed together in a traditional FORC diagram, but these signatures can be identified individually when using the various FORC diagrams discussed here. The ability to make different FORC measurements and to identify separately each magnetic component by investigating different magnetization types can provide much‐improved understanding of the information provided by FORC diagrams. In particular, the transient hysteresis FORC diagram provides a method to measure the nucleation field of magnetic vortices and domain walls. We provide a simple explanation for FORC results from natural multidomain samples that are not explained by conventional domain wall pinning models. We also provide software for processing the different types of FORC data.

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Section: Discussionmentioning

confidence: 99%

Magnetic domain state diagnosis using hysteresis reversal curves

et al. 2017

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“…This makes it useful to have robust nonheating paleointensity techniques. Muxworthy and Heslop [] proposed a new nonheating approach for paleointensity determination based on Preisach [] theory. In this approach, Preisach [] models are used to predict the response of a magnetic particle system to variations in magnetic field, thermal activation energy, and temperature.…”

Section: Geophysical Geological and Environmental Prospects For Usementioning

confidence: 99%

“…FORC diagrams also have the advantage of enabling determination of the strength of magnetostatic interactions, which are assumed not to be present and are not considered in conventional paleointensity approaches. Additionally, paleointensity estimations with the Preisach‐based approach are claimed to not depend on magnetic domain state [ Muxworthy and Heslop , ]. The theoretical framework provided by Muxworthy and Heslop [] has been extensively tested on modern volcanic materials from which paleointensities have been determined with other methods and for which the present‐day geomagnetic field intensity is known [ Muxworthy et al ., ].…”

Section: Geophysical Geological and Environmental Prospects For Usementioning

confidence: 99%

Understanding fine magnetic particle systems through use of first-order reversal curve diagrams

et al. 2014

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First-order reversal curve (FORC) diagrams are constructed from a class of partial magnetic hysteresis loops known as first-order reversal curves and are used to understand magnetization processes in fine magnetic particle systems. A wide-ranging literature that is pertinent to interpretation of FORC diagrams has been published in the geophysical and solid-state physics literature over the past 15 years and is summarized in this review. We discuss practicalities related to optimization of FORC measurements and important issues relating to the calculation, presentation, statistical significance, and interpretation of FORC diagrams. We also outline a framework for interpreting the magnetic behavior of magnetostatically noninteracting and interacting single domain, superparamagnetic, multidomain, single vortex, and pseudosingle domain particle systems. These types of magnetic behavior are illustrated mainly with geological examples relevant to paleomagnetism, rock magnetism, and environmental magnetism. These technical, experimental, and interpretational considerations are relevant to applications that range from improving particulate media for magnetic recording in materials science, to providing a foundation for understanding geomagnetic recording by rocks in geophysics, to interpreting depositional, microbiological, and environmental processes in sediments.

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“…The method uses minor hysteresis loops to calculate mathematical coercivity distributions and reversible and irreversible behavior of the magnetic carriers, and from such measurements to estimate single‐domain (SD), pseudo‐single domain (PSD), and multidomain (MD) contributions. Advanced FORC analysis has been developed to detect the presence of magnetofossils [ Egli et al , ], to roughly estimate, without heating, the intensity of the external field in which thermoremanence was acquired [ Muxworthy and Heslop , ] and for quantitative unmixing of magnetic components, primarily in sediments [ Heslop et al , ; Lascu et al , ].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Preisach maps: Detecting and characterizing separate remanent magnetic fractions in complex natural samples

Church¹,

Fabian

McEnroe³

2016

JGR Solid Earth

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Natural remanent magnetization carriers in rocks can contain mixtures of magnetic minerals that interact in complex ways and are challenging to characterize by current measurement techniques. Here a nonlinear mapping scheme is described that efficiently enhances sensitivity and the resolution power of remanent Preisach maps. Using this scheme a large dynamic range of magnetic moments and coercivities can be reliably resolved. The method is applied to synthetic and natural standard samples containing magnetite and hematite, as well as to natural samples from remanent magnetic anomalies where complex microstructures are observed. It is shown that certain offset high‐coercivity patterns in remanent Preisach maps may serve as fingerprints for exsolution structures of ilmenite in hematite or hematite in ilmenite and that in some magnetite‐bearing remanent anomalies the magnetite coercivity is increased beyond its intrinsic coercivity range. Experimental results and theoretical considerations indicate a minimal coercivity of about 10 mT for single‐domain (SD) magnetite, such that observation of lower coercivities implies pseudo‐SD (PSD) or multidomain grain sizes. A diagnostic hematite pattern with a peak downward offset of 17 ± 2% of the intrinsic coercivity is found that is stable over a large range of intrinsic coercivities and may be related to shielding of internal defect or lamellar moments by a spin canting response to the internal field.

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A Preisach method for estimating absolute paleofield intensity under the constraint of using only isothermal measurements: 1. Theoretical framework

Cited by 25 publications

References 61 publications

Magnetic domain state diagnosis using hysteresis reversal curves

Magnetic domain state diagnosis using hysteresis reversal curves

Understanding fine magnetic particle systems through use of first-order reversal curve diagrams

Nonlinear Preisach maps: Detecting and characterizing separate remanent magnetic fractions in complex natural samples

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