Magneto-optic imaging: Normal and parallel field components of in-plane magnetized samples

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Magneto-optical (MO) imaging has become a powerful tool for determining magnetic properties of materials by detecting the stray magnetic fields. The technique consists in measuring the Faraday rotation, θF, in the light polarization plane when light travels through a transparent sensitive garnet (fe...

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Autores principales: Ferrari, H., Bekeris, V., Thibeault, M., Johansen, T.H.
Formato: JOUR
Materias:
In-plane
Indicator magnetic domain
Magneto-optics
Out of plane magnetization
Faraday effect
Light polarization
Magnetic domains
Magnetic field effects
Magnetic properties
Magnetization
In-plane magnetized tapes
Plane magnetization
Sinusoidal waveforms
Imaging systems
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03048853_v313_n1_p98_Ferrari
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03048853_v313_n1_p98_Ferrari
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spelling todo:paper_03048853_v313_n1_p98_Ferrari2023-10-03T15:21:07Z Magneto-optic imaging: Normal and parallel field components of in-plane magnetized samples Ferrari, H. Bekeris, V. Thibeault, M. Johansen, T.H. In-plane Indicator magnetic domain Magneto-optics Out of plane magnetization Faraday effect Light polarization Magnetic domains Magnetic field effects Magnetic properties Magnetization In-plane magnetized tapes Indicator magnetic domain Plane magnetization Sinusoidal waveforms Imaging systems Magneto-optical (MO) imaging has become a powerful tool for determining magnetic properties of materials by detecting the stray magnetic fields. The technique consists in measuring the Faraday rotation, θF, in the light polarization plane when light travels through a transparent sensitive garnet (ferrite garnet film, FGF) placed in close contact to the sample. For in-plane magnetized samples, the MO image is not trivially related to the sample magnetization, and to contribute to this understanding we have imaged commercial audio tapes in which computer-generated functions were recorded. We present MO images of periodically in-plane magnetized tapes with square, sawtooth, triangular and sinusoidal waveforms, for which we analytically calculate the perpendicular and parallel stray magnetic field components generated by the tape. As a first approach we correlate the measured light intensity with the perpendicular magnetic field component at the FGF, and we show that it can be approximated to the gradient of the sample magnetization. A more detailed calculation, taking into account the effect of both field components in the Faraday rotation, is presented and satisfactorily compared with the obtained MO images. The presence of magnetic domains in the garnet is shown to be related to the change in sign of the parallel component of the stray magnetic field, which can be approximated to the second derivative of the sample magnetization. © 2007 Elsevier B.V. All rights reserved. Fil:Ferrari, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bekeris, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Thibeault, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03048853_v313_n1_p98_Ferrari
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic In-plane
Indicator magnetic domain
Magneto-optics
Out of plane magnetization
Faraday effect
Light polarization
Magnetic domains
Magnetic field effects
Magnetic properties
Magnetization
In-plane magnetized tapes
Indicator magnetic domain
Plane magnetization
Sinusoidal waveforms
Imaging systems
spellingShingle In-plane
Indicator magnetic domain
Magneto-optics
Out of plane magnetization
Faraday effect
Light polarization
Magnetic domains
Magnetic field effects
Magnetic properties
Magnetization
In-plane magnetized tapes
Indicator magnetic domain
Plane magnetization
Sinusoidal waveforms
Imaging systems
Ferrari, H.
Bekeris, V.
Thibeault, M.
Johansen, T.H.
Magneto-optic imaging: Normal and parallel field components of in-plane magnetized samples
topic_facet In-plane
Indicator magnetic domain
Magneto-optics
Out of plane magnetization
Faraday effect
Light polarization
Magnetic domains
Magnetic field effects
Magnetic properties
Magnetization
In-plane magnetized tapes
Indicator magnetic domain
Plane magnetization
Sinusoidal waveforms
Imaging systems
description Magneto-optical (MO) imaging has become a powerful tool for determining magnetic properties of materials by detecting the stray magnetic fields. The technique consists in measuring the Faraday rotation, θF, in the light polarization plane when light travels through a transparent sensitive garnet (ferrite garnet film, FGF) placed in close contact to the sample. For in-plane magnetized samples, the MO image is not trivially related to the sample magnetization, and to contribute to this understanding we have imaged commercial audio tapes in which computer-generated functions were recorded. We present MO images of periodically in-plane magnetized tapes with square, sawtooth, triangular and sinusoidal waveforms, for which we analytically calculate the perpendicular and parallel stray magnetic field components generated by the tape. As a first approach we correlate the measured light intensity with the perpendicular magnetic field component at the FGF, and we show that it can be approximated to the gradient of the sample magnetization. A more detailed calculation, taking into account the effect of both field components in the Faraday rotation, is presented and satisfactorily compared with the obtained MO images. The presence of magnetic domains in the garnet is shown to be related to the change in sign of the parallel component of the stray magnetic field, which can be approximated to the second derivative of the sample magnetization. © 2007 Elsevier B.V. All rights reserved.
format JOUR
author Ferrari, H.
Bekeris, V.
Thibeault, M.
Johansen, T.H.
author_facet Ferrari, H.
Bekeris, V.
Thibeault, M.
Johansen, T.H.
author_sort Ferrari, H.
title Magneto-optic imaging: Normal and parallel field components of in-plane magnetized samples
title_short Magneto-optic imaging: Normal and parallel field components of in-plane magnetized samples
title_full Magneto-optic imaging: Normal and parallel field components of in-plane magnetized samples
title_fullStr Magneto-optic imaging: Normal and parallel field components of in-plane magnetized samples
title_full_unstemmed Magneto-optic imaging: Normal and parallel field components of in-plane magnetized samples
title_sort magneto-optic imaging: normal and parallel field components of in-plane magnetized samples
url http://hdl.handle.net/20.500.12110/paper_03048853_v313_n1_p98_Ferrari
work_keys_str_mv AT ferrarih magnetoopticimagingnormalandparallelfieldcomponentsofinplanemagnetizedsamples
AT bekerisv magnetoopticimagingnormalandparallelfieldcomponentsofinplanemagnetizedsamples
AT thibeaultm magnetoopticimagingnormalandparallelfieldcomponentsofinplanemagnetizedsamples
AT johansenth magnetoopticimagingnormalandparallelfieldcomponentsofinplanemagnetizedsamples
_version_ 1807314720417382400

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