Magnetic micro-structural uniformity of die-upset Nd-Fe-B magnets

Yikun Fang, Xiaolu Yin, Rui Zhao, Shah Valloppilly, Wei Li, Minggang Zhu, Sy Hwang Liou

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Die-upset Nd 13.62Fe 75.70Co 4.45B 5.76Ga 0.47 magnets have been prepared with height reduction (h) in the range of 60 to 88. The energy product as high as 50.4 MGOe was obtained in the sample with h ∼ 70. The magnetic domains of the samples are revealed by using magnetic force microscopy (MFM). The average domain widths of the die-upset samples with surface normal parallel (//) and perpendicular (∥) to the loading direction are in the range of w //: 0.4-0.6 m; w : 0.9-3.8 m, respectively. These interaction domains are formed due to the strong inter-granular exchange interaction and magnetostatic interaction between grains. It was found that the ratio of φ rms // to φ rms equiv; is a good indicator for the quality of the magnet, where the φ rms // and φ rms equiv; are defined as the root-mean-square values of phase shift for the MFM images. The microstructures have been investigated by scanning electron microscopy (SEM), MFM and SEM results indicate the magnetic and crystalline microstructures are uniform for the sample with h ∼ 70%, giving rise to the highest magnetic performance among these samples.

Original languageEnglish (US)
Article number07A734
JournalJournal of Applied Physics
Volume111
Issue number7
DOIs
StatePublished - Apr 1 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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