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Barkhausen jumps and magnetic viscosity in NdFeB magnets

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Title: Barkhausen jumps and magnetic viscosity in NdFeB magnets
Authors: LoBue, M. lobue@ien.it, Basso, V.1, Beatrice, G.1, Bertotti, C.1, Durin, G.1, Sasso, C.P.1
Source: Journal of Magnetism & Magnetic Materials. Apr2005, Vol. 290-291, p1184-1187. 4p.
Subjects: Noise, Magnetization, Viscosity, Ferromagnetism
Abstract: Abstract: We present the analysis of Barkhausen noise measured on a Nd–Fe–B sintered sample during viscosity experiments at constant applied field H. The measured jump sizes give direct evidence that the dominant magnetization process is the reversal of a single or of a small group of grains. The Barkhausen noise average amplitude allows to evaluate the viscosity coefficient S and the related activation volume . We found nm which is comparable to the domain wall width, in agreement with previous interpretations. The Barkhausen jump sizes show a power-law distribution independent of the time elapsed from the beginning of the relaxation. This fact validates the interpretation of the observed relaxations as due to thermal activation over a distribution of energy barriers. [Copyright &y& Elsevier]
Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 17553815
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Barkhausen jumps and magnetic viscosity in NdFeB magnets
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  Data: <searchLink fieldCode="AR" term="%22LoBue%2C+M%2E%22">LoBue, M.</searchLink><i> lobue@ien.it</i><br /><searchLink fieldCode="AR" term="%22Basso%2C+V%2E%22">Basso, V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Beatrice%2C+G%2E%22">Beatrice, G.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bertotti%2C+C%2E%22">Bertotti, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Durin%2C+G%2E%22">Durin, G.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sasso%2C+C%2EP%2E%22">Sasso, C.P.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Magnetism+%26+Magnetic+Materials%22">Journal of Magnetism & Magnetic Materials</searchLink>. Apr2005, Vol. 290-291, p1184-1187. 4p.
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  Data: Abstract: We present the analysis of Barkhausen noise measured on a Nd–Fe–B sintered sample during viscosity experiments at constant applied field H. The measured jump sizes give direct evidence that the dominant magnetization process is the reversal of a single or of a small group of grains. The Barkhausen noise average amplitude allows to evaluate the viscosity coefficient S and the related activation volume . We found nm which is comparable to the domain wall width, in agreement with previous interpretations. The Barkhausen jump sizes show a power-law distribution independent of the time elapsed from the beginning of the relaxation. This fact validates the interpretation of the observed relaxations as due to thermal activation over a distribution of energy barriers. [Copyright &y& Elsevier]
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  Group: Ab
  Data: <i>Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.jmmm.2004.11.380
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      – Code: eng
        Text: English
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        StartPage: 1184
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      – SubjectFull: Noise
        Type: general
      – SubjectFull: Magnetization
        Type: general
      – SubjectFull: Viscosity
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      – SubjectFull: Ferromagnetism
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      – TitleFull: Barkhausen jumps and magnetic viscosity in NdFeB magnets
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            NameFull: Sasso, C.P.
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              Text: Apr2005
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              Y: 2005
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              Value: 290-291
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