High coercivity in mechanically milled ThMn[sub 12]-type Nd-Fe-Mo nitrides

Zhang, Xiao-dong; Xiao-dong Zhang; Cheng, Ben-pei; Ben-pei Cheng; Yang, Ying-chang; Ying-chang Yang
December 2000
Applied Physics Letters;12/11/2000, Vol. 77 Issue 24
Academic Journal
Starting from carefully homogenized Nd[sub 10]Fe[sub 90-y]Mo[sub y] (y=12, 10, 7) alloys and by appropriate mechanical milling, the as-milled microstructure consisting of a nanoscale mixture of severely distorted 1:12 phase and substitutional α-Fe-based solid solution was obtained. This kind of as-milled microstructure was thought to have a critical effect on the formation of iron-free nanocrystalline 1:12 phase during subsequent annealing. Upon nitrogenation, the sample of Nd[sub 10]Fe[sub 78]Mo[sub 12]N[sub x] exhibited a record-high coercivity of 13.1 kOe at 293 K. Measurements of initial magnetization curve and a family of demagnetization curves engendered under different maximum applied fields H[sub m] were carried out, and the results revealed the domain-wall pinning at grain boundaries as the coercivity mechanism. A low Mo-content sample of Nd[sub 10]Fe[sub 83]Mo[sub 7]N[sub x] with [sub i]H[sub c]∼5.8 kOe, B[sub r]∼6.8 kG, and (BH)[sub max]∼7.0 MG Oe was made by optimizing the preparation conditions. © 2000 American Institute of Physics.


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