Hf doping effect on hard magnetism of nanocrystalline Zr 18-x Hf x Co 82 ribbons

I. A. Al-Omari, W. Y. Zhang, Lanping Yue, R. Skomski, J. E. Shield, X. Z. Li, David J Sellmyer

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The effects of substituting Zr by Hf on the structural and the magnetic properties of the nanocrystalline rapidly solidified Zr 18-x Hf x Co 82 ribbons (x = 0, 2, 4, and 6) have been studied. X-ray diffraction and thermomagnetic measurement results indicated that upon rapid solidification processing four magnetic phases occur: rhombohedral Zr 2 Co 11 , orthorhombic Zr 2 Co 11 , hcp Co, and cubic Zr 6 Co 23 phases. Microstructure analysis results showed the reduction in the percentage of the soft-magnetic phase (Co) compared to the hard-magnetic phase (Zr 2 Co 11 (rhombohedral)) with the increase in the Hf concentration. All the samples under investigation have ferromagnetic nature, at 4.2 K and at room temperature. The coercive force (H c ) and the saturation magnetization (M s ) are found to linearly increases with x (x ≤ 2), then H c slightly increases and M s slightly decreases with increasing x. The maximum energy product (BH}) max at room temperature is found to increases with increasing x reaching a maximum value for x = 4. The magnetocrystalline anisotropy parameter of these samples are calculated to be K = 1.1 MJ/m 3 and independent of Hf concentration. The above results indicate that the replacement of Zr by Hf improves the hard-magnetic properties of this class of rear-earth-free nanocrystalline permanent magnet materials.

Original languageEnglish (US)
Article number6559021
Pages (from-to)3394-3397
Number of pages4
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
StatePublished - Aug 2 2013

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Magnetism
Magnetic properties
Doping (additives)
Magnetocrystalline anisotropy
Rapid solidification
Saturation magnetization
Coercive force
Permanent magnets
Earth (planet)
X ray diffraction
Temperature
Microstructure
Processing

Keywords

  • Energy
  • magnetization
  • microstructure
  • nanomaterials
  • permanent magnets

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Al-Omari, I. A., Zhang, W. Y., Yue, L., Skomski, R., Shield, J. E., Li, X. Z., & Sellmyer, D. J. (2013). Hf doping effect on hard magnetism of nanocrystalline Zr 18-x Hf x Co 82 ribbons IEEE Transactions on Magnetics, 49(7), 3394-3397. [6559021]. https://doi.org/10.1109/TMAG.2013.2245498

Hf doping effect on hard magnetism of nanocrystalline Zr 18-x Hf x Co 82 ribbons . / Al-Omari, I. A.; Zhang, W. Y.; Yue, Lanping; Skomski, R.; Shield, J. E.; Li, X. Z.; Sellmyer, David J.

In: IEEE Transactions on Magnetics, Vol. 49, No. 7, 6559021, 02.08.2013, p. 3394-3397.

Research output: Contribution to journalArticle

Al-Omari, IA, Zhang, WY, Yue, L, Skomski, R, Shield, JE, Li, XZ & Sellmyer, DJ 2013, ' Hf doping effect on hard magnetism of nanocrystalline Zr 18-x Hf x Co 82 ribbons ', IEEE Transactions on Magnetics, vol. 49, no. 7, 6559021, pp. 3394-3397. https://doi.org/10.1109/TMAG.2013.2245498
Al-Omari IA, Zhang WY, Yue L, Skomski R, Shield JE, Li XZ et al. Hf doping effect on hard magnetism of nanocrystalline Zr 18-x Hf x Co 82 ribbons IEEE Transactions on Magnetics. 2013 Aug 2;49(7):3394-3397. 6559021. https://doi.org/10.1109/TMAG.2013.2245498
Al-Omari, I. A. ; Zhang, W. Y. ; Yue, Lanping ; Skomski, R. ; Shield, J. E. ; Li, X. Z. ; Sellmyer, David J. / Hf doping effect on hard magnetism of nanocrystalline Zr 18-x Hf x Co 82 ribbons In: IEEE Transactions on Magnetics. 2013 ; Vol. 49, No. 7. pp. 3394-3397.
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