Anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains

A phenomenological model based on a linear relationship between the magnetic coercivity field and the reciprocal of the grain diameter is applied to explain the anhysteretic remanent magnetization (ARM) imparted to artificial samples with different concentrations of a very well characterized magneti...

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Publicado:	2018
Materias:	ARM magnetite micromagnetism SEM thermomagnetic curves concentration (composition) geomagnetism grain size remanent magnetization sampling scanning electron microscopy size distribution
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v62_n2_p339_Vasquez http://hdl.handle.net/20.500.12110/paper_00393169_v62_n2_p339_Vasquez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00393169_v62_n2_p339_Vasquez
record_format	dspace
spelling	paper:paper_00393169_v62_n2_p339_Vasquez2023-06-08T15:03:27Z Anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains ARM magnetite micromagnetism SEM thermomagnetic curves concentration (composition) geomagnetism grain size magnetite remanent magnetization sampling scanning electron microscopy size distribution A phenomenological model based on a linear relationship between the magnetic coercivity field and the reciprocal of the grain diameter is applied to explain the anhysteretic remanent magnetization (ARM) imparted to artificial samples with different concentrations of a very well characterized magnetite powder. By analyses of scanning electron microscopy images, the spherically shaped single domain synthetic magnetite is found to follow a lognormal grain size distribution with ~86 nm of mean diameter. The proposed model, fitted to ARM measurements up to a peak alternating field of 100 mT, yields a very good agreement. The coercivity behaviour predicted by micromagnetism theory disagrees with the experimental results of this work. A likely explanation for the discrepancy is that the magnetite particles, which consist of a mixture of grains in coherent rotation and curling modes, produce similar observations as domain processes. © 2018, Institute of Geophysics of the ASCR, v.v.i. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v62_n2_p339_Vasquez http://hdl.handle.net/20.500.12110/paper_00393169_v62_n2_p339_Vasquez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	ARM magnetite micromagnetism SEM thermomagnetic curves concentration (composition) geomagnetism grain size magnetite remanent magnetization sampling scanning electron microscopy size distribution
spellingShingle	ARM magnetite micromagnetism SEM thermomagnetic curves concentration (composition) geomagnetism grain size magnetite remanent magnetization sampling scanning electron microscopy size distribution Anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains
topic_facet	ARM magnetite micromagnetism SEM thermomagnetic curves concentration (composition) geomagnetism grain size magnetite remanent magnetization sampling scanning electron microscopy size distribution
description	A phenomenological model based on a linear relationship between the magnetic coercivity field and the reciprocal of the grain diameter is applied to explain the anhysteretic remanent magnetization (ARM) imparted to artificial samples with different concentrations of a very well characterized magnetite powder. By analyses of scanning electron microscopy images, the spherically shaped single domain synthetic magnetite is found to follow a lognormal grain size distribution with ~86 nm of mean diameter. The proposed model, fitted to ARM measurements up to a peak alternating field of 100 mT, yields a very good agreement. The coercivity behaviour predicted by micromagnetism theory disagrees with the experimental results of this work. A likely explanation for the discrepancy is that the magnetite particles, which consist of a mixture of grains in coherent rotation and curling modes, produce similar observations as domain processes. © 2018, Institute of Geophysics of the ASCR, v.v.i.
title	Anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains
title_short	Anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains
title_full	Anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains
title_fullStr	Anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains
title_full_unstemmed	Anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains
title_sort	anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains
publishDate	2018
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v62_n2_p339_Vasquez http://hdl.handle.net/20.500.12110/paper_00393169_v62_n2_p339_Vasquez
_version_	1768544858925957120

Anhysteretic remanent magnetization: model of grain size distribution of spherical magnetite grains

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