Cluster-assembled iron-platinum nanocomposite permanent magnets

Xiangxin Rui, Zhiguang Sun, Yingfan Xu, David J Sellmyer, Jeffrey E. Shield

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Exchange-spring nanocomposite permanent magnets have received a great deal of attention for their potential for improved the energy products. Predicted results, however, has been elusive. Optimal properties rely on a uniformly fine nanostructure. Particularly, the soft magnetic phase must be below approximately 10 nm to ensure complete exchange coupling. Inert gas condensation (IGC) is an ideal processing route to produce sub-10 nm clusters method. Two distinct nanostructures have been produced. In the first, Fe clusters were embedded in an FePt matrix by alternate deposition from two sources. Fe cluster content ranged from 0 to 30 volume percent. Post-deposition multi-step heat treatments converted the FePt from the A1 to L10 structure. An energy product of approximately 21 MGOe was achieved. Properties deteriorated rapidly at cluster concentrations above 14 volume due to uncoupled soft magnetic regions (from cluster-cluster contacts) and cooperative reversal. The second nanostructure, designed to overcome those disadvantages, involved intra-cluster structuring. Here, Fe-rich Fe-Pt clusters separated by C or SiO2 were fabricated. Phase separation into Fe3Pt and FePt and ordering was induced during post-deposition multi-step heat treatments. By confining the soft and hard phases to individual clusters, full exchange coupling was accomplished and cooperative reversal between clusters was effectively eliminated. An energy product of more than 25 MGOe was achieved, and the volume fraction of the soft phase was increased to greater than 0.5 while maintaining a coercivity of 6.5 kOe. The results provide new insight into developing high energy product nanostructured permanent magnets.

Original languageEnglish (US)
Title of host publicationNanoscale Magnets
Subtitle of host publicationSynthesis, Self-Assembly, Properties and Applications
Pages97-102
Number of pages6
StatePublished - Dec 1 2006
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 27 2006Dec 1 2006

Publication series

NameMaterials Research Society Symposium Proceedings
Volume962
ISSN (Print)0272-9172

Conference

Conference2006 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period11/27/0612/1/06

Fingerprint

Platinum
Permanent magnets
Nanostructures
Nanocomposites
Exchange coupling
Iron
Heat treatment
Noble Gases
Inert gases
Coercive force
Phase separation
Condensation
Volume fraction
Processing

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Rui, X., Sun, Z., Xu, Y., Sellmyer, D. J., & Shield, J. E. (2006). Cluster-assembled iron-platinum nanocomposite permanent magnets. In Nanoscale Magnets: Synthesis, Self-Assembly, Properties and Applications (pp. 97-102). (Materials Research Society Symposium Proceedings; Vol. 962).

Cluster-assembled iron-platinum nanocomposite permanent magnets. / Rui, Xiangxin; Sun, Zhiguang; Xu, Yingfan; Sellmyer, David J; Shield, Jeffrey E.

Nanoscale Magnets: Synthesis, Self-Assembly, Properties and Applications. 2006. p. 97-102 (Materials Research Society Symposium Proceedings; Vol. 962).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Rui, X, Sun, Z, Xu, Y, Sellmyer, DJ & Shield, JE 2006, Cluster-assembled iron-platinum nanocomposite permanent magnets. in Nanoscale Magnets: Synthesis, Self-Assembly, Properties and Applications. Materials Research Society Symposium Proceedings, vol. 962, pp. 97-102, 2006 MRS Fall Meeting, Boston, MA, United States, 11/27/06.
Rui X, Sun Z, Xu Y, Sellmyer DJ, Shield JE. Cluster-assembled iron-platinum nanocomposite permanent magnets. In Nanoscale Magnets: Synthesis, Self-Assembly, Properties and Applications. 2006. p. 97-102. (Materials Research Society Symposium Proceedings).
Rui, Xiangxin ; Sun, Zhiguang ; Xu, Yingfan ; Sellmyer, David J ; Shield, Jeffrey E. / Cluster-assembled iron-platinum nanocomposite permanent magnets. Nanoscale Magnets: Synthesis, Self-Assembly, Properties and Applications. 2006. pp. 97-102 (Materials Research Society Symposium Proceedings).
@inproceedings{e8f7fd101ffc42deaa9575d8a910a3bd,
title = "Cluster-assembled iron-platinum nanocomposite permanent magnets",
abstract = "Exchange-spring nanocomposite permanent magnets have received a great deal of attention for their potential for improved the energy products. Predicted results, however, has been elusive. Optimal properties rely on a uniformly fine nanostructure. Particularly, the soft magnetic phase must be below approximately 10 nm to ensure complete exchange coupling. Inert gas condensation (IGC) is an ideal processing route to produce sub-10 nm clusters method. Two distinct nanostructures have been produced. In the first, Fe clusters were embedded in an FePt matrix by alternate deposition from two sources. Fe cluster content ranged from 0 to 30 volume percent. Post-deposition multi-step heat treatments converted the FePt from the A1 to L10 structure. An energy product of approximately 21 MGOe was achieved. Properties deteriorated rapidly at cluster concentrations above 14 volume due to uncoupled soft magnetic regions (from cluster-cluster contacts) and cooperative reversal. The second nanostructure, designed to overcome those disadvantages, involved intra-cluster structuring. Here, Fe-rich Fe-Pt clusters separated by C or SiO2 were fabricated. Phase separation into Fe3Pt and FePt and ordering was induced during post-deposition multi-step heat treatments. By confining the soft and hard phases to individual clusters, full exchange coupling was accomplished and cooperative reversal between clusters was effectively eliminated. An energy product of more than 25 MGOe was achieved, and the volume fraction of the soft phase was increased to greater than 0.5 while maintaining a coercivity of 6.5 kOe. The results provide new insight into developing high energy product nanostructured permanent magnets.",
author = "Xiangxin Rui and Zhiguang Sun and Yingfan Xu and Sellmyer, {David J} and Shield, {Jeffrey E.}",
year = "2006",
month = "12",
day = "1",
language = "English (US)",
isbn = "9781604234145",
series = "Materials Research Society Symposium Proceedings",
pages = "97--102",
booktitle = "Nanoscale Magnets",

}

TY - GEN

T1 - Cluster-assembled iron-platinum nanocomposite permanent magnets

AU - Rui, Xiangxin

AU - Sun, Zhiguang

AU - Xu, Yingfan

AU - Sellmyer, David J

AU - Shield, Jeffrey E.

PY - 2006/12/1

Y1 - 2006/12/1

N2 - Exchange-spring nanocomposite permanent magnets have received a great deal of attention for their potential for improved the energy products. Predicted results, however, has been elusive. Optimal properties rely on a uniformly fine nanostructure. Particularly, the soft magnetic phase must be below approximately 10 nm to ensure complete exchange coupling. Inert gas condensation (IGC) is an ideal processing route to produce sub-10 nm clusters method. Two distinct nanostructures have been produced. In the first, Fe clusters were embedded in an FePt matrix by alternate deposition from two sources. Fe cluster content ranged from 0 to 30 volume percent. Post-deposition multi-step heat treatments converted the FePt from the A1 to L10 structure. An energy product of approximately 21 MGOe was achieved. Properties deteriorated rapidly at cluster concentrations above 14 volume due to uncoupled soft magnetic regions (from cluster-cluster contacts) and cooperative reversal. The second nanostructure, designed to overcome those disadvantages, involved intra-cluster structuring. Here, Fe-rich Fe-Pt clusters separated by C or SiO2 were fabricated. Phase separation into Fe3Pt and FePt and ordering was induced during post-deposition multi-step heat treatments. By confining the soft and hard phases to individual clusters, full exchange coupling was accomplished and cooperative reversal between clusters was effectively eliminated. An energy product of more than 25 MGOe was achieved, and the volume fraction of the soft phase was increased to greater than 0.5 while maintaining a coercivity of 6.5 kOe. The results provide new insight into developing high energy product nanostructured permanent magnets.

AB - Exchange-spring nanocomposite permanent magnets have received a great deal of attention for their potential for improved the energy products. Predicted results, however, has been elusive. Optimal properties rely on a uniformly fine nanostructure. Particularly, the soft magnetic phase must be below approximately 10 nm to ensure complete exchange coupling. Inert gas condensation (IGC) is an ideal processing route to produce sub-10 nm clusters method. Two distinct nanostructures have been produced. In the first, Fe clusters were embedded in an FePt matrix by alternate deposition from two sources. Fe cluster content ranged from 0 to 30 volume percent. Post-deposition multi-step heat treatments converted the FePt from the A1 to L10 structure. An energy product of approximately 21 MGOe was achieved. Properties deteriorated rapidly at cluster concentrations above 14 volume due to uncoupled soft magnetic regions (from cluster-cluster contacts) and cooperative reversal. The second nanostructure, designed to overcome those disadvantages, involved intra-cluster structuring. Here, Fe-rich Fe-Pt clusters separated by C or SiO2 were fabricated. Phase separation into Fe3Pt and FePt and ordering was induced during post-deposition multi-step heat treatments. By confining the soft and hard phases to individual clusters, full exchange coupling was accomplished and cooperative reversal between clusters was effectively eliminated. An energy product of more than 25 MGOe was achieved, and the volume fraction of the soft phase was increased to greater than 0.5 while maintaining a coercivity of 6.5 kOe. The results provide new insight into developing high energy product nanostructured permanent magnets.

UR - http://www.scopus.com/inward/record.url?scp=41049094829&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=41049094829&partnerID=8YFLogxK

M3 - Conference contribution

SN - 9781604234145

T3 - Materials Research Society Symposium Proceedings

SP - 97

EP - 102

BT - Nanoscale Magnets

ER -