### Abstract

The structure and magnetostriction of (Tb1-xNdx)(Fe0.4Co0.6)1.9 (0≪x≪1) alloys have been investigated at room temperature and the magnetic properties determined over the temperature range 1.5-300 K. It was found that the matrix of (Tb1-xNdx)(Fe0.4Co0.6)1.9 is essentially that of a (Tb,Nd) (Fe,Co)2 phase with a MgCu2-type cubic Laves structure for all values of x. The lattice parameter of the Laves phase increases from 0.7297 to 0.7363 nm as x increases from 0 to 1 and obeys Vegard's law. We have measured the Curie temperature to decrease with increasing x from 667 K for Tb(Fe0.4Co0.6)Fe1.9 to 454 K for Nd(Fe0.4Co0.6)Fe1.9. The resultant macroscopic magnetization becomes zero when x=0.45 at a temperature of 1.5 K. At 300 K, a slightly smaller value of x is found to produce no resultant magnetization, and the spontaneous magnetostriction constant λ111 decreases slowly with increasing Nd content and vanishes abruptly from a value of 1630×10-6 when x≫0.65. The polycrystalline isofield magnetostriction curves exhibit a minimum at x=0.45 and a peak at x=0.65. The observed behavior can be explained on the basis of opposing rare-earth Tb and Nd moments and an anisotropy minimum close to x=0.65. As the temperature is reduced below 300 K, the spin reorientation occurs at greater Nd concentrations.

Original language | English |
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Pages (from-to) | 6310-6314 |

Number of pages | 5 |

Journal | Journal of Applied Physics |

Volume | 86 |

Issue number | 11 |

Publication status | Published - 1 Dec 1999 |

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## Cite this

Guo, Z. J., Busbridge, S., Wang, B. W., Zhang, Z. D., Zhao, X. G., & Geng, D. Y. (1999). Structure, magnetic properties and magnetostriction of (Tb1-xNdx)(Fe0.4Co0.6)1.9.

*Journal of Applied Physics*,*86*(11), 6310-6314.