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High-energy product exchange-spring FePt/Fe cluster nanocomposite permanent magnets

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Title: High-energy product exchange-spring FePt/Fe cluster nanocomposite permanent magnets
Authors: Rui, X.1 repreter@hotmail.com, Shield, J.E.1, Sun, Z.2, Yue, L.2, Xu, Y.2, Sellmyer, D.J.2, Liu, Z.3, Miller, D.J.3
Source: Journal of Magnetism & Magnetic Materials. Oct2006, Vol. 305 Issue 1, p76-82. 7p.
Subjects: Heating equipment, Interviewing, Matrices (Mathematics), Magnetic properties
Abstract: Abstract: In this paper, we report on the production of Fe cluster/FePt matrix nanocomposite permanent magnets. Monodispersed Fe clusters with sizes below 10nm were formed by gas aggregation techniques. These Fe clusters were imbedded in an FePt matrix by alternate deposition from two sources. Specimens with a range of Fe cluster phase content from 0 to 30vol% were produced by controlling deposition times from each source. As-deposited FePt formed in the A1 structure; thus, post-deposition heat treatment was necessary to form the hard magnetic L10 FePt compound. A single-step heat treatment at 600°C for 10min leads to nanocomposite structures with excellent magnetic properties. The coercivity decreased with increasing Fe cluster content, while the energy product initially increased, reaching a maximum of almost 18MGOe, and then decreased at higher Fe cluster content. Secondary heat treatment at 500°C significantly improved the magnetic properties when compared with the single-step heat treatment at 600°C. Increased coercivity and remanence was observed, resulting in energy products of 21MGOe. The energy products are close to 70 percent greater than expected for uncoupled systems. [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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DbLabel: Engineering Source
An: 21283762
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: High-energy product exchange-spring FePt/Fe cluster nanocomposite permanent magnets
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  Data: <searchLink fieldCode="AR" term="%22Rui%2C+X%2E%22">Rui, X.</searchLink><relatesTo>1</relatesTo><i> repreter@hotmail.com</i><br /><searchLink fieldCode="AR" term="%22Shield%2C+J%2EE%2E%22">Shield, J.E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sun%2C+Z%2E%22">Sun, Z.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Yue%2C+L%2E%22">Yue, L.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Xu%2C+Y%2E%22">Xu, Y.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Sellmyer%2C+D%2EJ%2E%22">Sellmyer, D.J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Liu%2C+Z%2E%22">Liu, Z.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Miller%2C+D%2EJ%2E%22">Miller, D.J.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Magnetism+%26+Magnetic+Materials%22">Journal of Magnetism & Magnetic Materials</searchLink>. Oct2006, Vol. 305 Issue 1, p76-82. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Heating+equipment%22">Heating equipment</searchLink><br /><searchLink fieldCode="DE" term="%22Interviewing%22">Interviewing</searchLink><br /><searchLink fieldCode="DE" term="%22Matrices+%28Mathematics%29%22">Matrices (Mathematics)</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+properties%22">Magnetic properties</searchLink>
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  Data: Abstract: In this paper, we report on the production of Fe cluster/FePt matrix nanocomposite permanent magnets. Monodispersed Fe clusters with sizes below 10nm were formed by gas aggregation techniques. These Fe clusters were imbedded in an FePt matrix by alternate deposition from two sources. Specimens with a range of Fe cluster phase content from 0 to 30vol% were produced by controlling deposition times from each source. As-deposited FePt formed in the A1 structure; thus, post-deposition heat treatment was necessary to form the hard magnetic L10 FePt compound. A single-step heat treatment at 600°C for 10min leads to nanocomposite structures with excellent magnetic properties. The coercivity decreased with increasing Fe cluster content, while the energy product initially increased, reaching a maximum of almost 18MGOe, and then decreased at higher Fe cluster content. Secondary heat treatment at 500°C significantly improved the magnetic properties when compared with the single-step heat treatment at 600°C. Increased coercivity and remanence was observed, resulting in energy products of 21MGOe. The energy products are close to 70 percent greater than expected for uncoupled systems. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
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  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.2005.11.032
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      – SubjectFull: Interviewing
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      – SubjectFull: Matrices (Mathematics)
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              Text: Oct2006
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