Nanostructured Nd-Fe-B magnets with enhanced remanence

J. Wecker, K. Schnitzke, H. Cerva, W. Grogger

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Nanostructured isotropic Nd-Fe-B magnets with enhanced remanence were produced by hot compaction of mechanically alloyed Nd-Fe-B powders at temperatures of about 600°C. Phase formation occurred during hot pressing without significant grain growth. The microstructure is a two phase nanocomposite of hard magnetic Nd2Fe14B and soft magnetic α-Fe with an average grain size of about 20 nm. These small dimensions allow effective exchange interactions between hard and soft magnetic grains and result in an enhancement of the remanence by more than 30% above the Stoner-Wolfarth limit expected for noninteracting single domain particles. So far, the best results are a remanence of 1.0 T, an energy density of 121 kJ/m3, and a coercivity of 4.2 kA/cm for a Nd-Fe-Co-Si-B magnet.

Original languageEnglish
Pages (from-to)563
Number of pages1
JournalApplied Physics Letters
Volume67
DOIs
Publication statusPublished - 1995

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remanence
magnets
hot pressing
coercivity
nanocomposites
flux density
grain size
rocks
microstructure
augmentation
interactions
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Nanostructured Nd-Fe-B magnets with enhanced remanence. / Wecker, J.; Schnitzke, K.; Cerva, H.; Grogger, W.

In: Applied Physics Letters, Vol. 67, 1995, p. 563.

Research output: Contribution to journalArticleResearchpeer-review

Wecker, J. ; Schnitzke, K. ; Cerva, H. ; Grogger, W. / Nanostructured Nd-Fe-B magnets with enhanced remanence. In: Applied Physics Letters. 1995 ; Vol. 67. pp. 563.
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