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Effect of Ga substitution on the structure and magnetic properties of melt-spun Pr3(Fe,Co,Ti)29 system

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6 Author(s)
Sirisha, K. ; Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 ; Chen, Q. ; Ma, B.M. ; Huang, M.Q.
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Melt-spun alloys of Pr3(Fe0.7Co0.3)27.5Ti1.5, Pr3(Fe0.6Co0.4)27.5Ti1.5, and Pr3(Fe0.5Ga0.1Co0.4)27.5Ti1.5 prepared at linear wheel speeds of 20, 30, and 40 m/s were found to contain nanocrystalline, a mixture of nanocrystalline and amorphous, and mostly amorphous phases, respectively. Grain sizes of ≪10 nm were observed for the crystalline phases. Annealed alloys showed an increase in grain size to 15–20 nm. The Curie temperature (TC) values observed in melt-spun alloys were lower than those observed in fully crystalline alloys. A reduction of ∼55 °C in TC was observed for the Pr3(Fe0.7Co0.3)27.5Ti1.5 composition compared to ∼15 °C for Pr3(Fe0.6Co0.4)27.5Ti1.5. For the Ga substituted alloy with Co=0.4, a large difference of ∼50 °C in TC was noted. MS values of 41 and 35 emu/g- were observed in alloys with Co=0.4 and Ga=0.1, and Co=0.4, respectively, at room temperature. Ga substitution increased the anisotropy field value, HA, but lowered the intrinsic coercivity value, Hci. In the alloys with Co=0.4 and Ga=0.1, and Co=0.4, spin reorientation transitions (TSR) were observed at 220 and 140 K respectively. The low values of Hci observed in melt-spun ribbons are attributed to large amounts of a soft α-Fe phase.

Published in:

Journal of Applied Physics  (Volume:101 ,  Issue: 9 )

Date of Publication:

May 2007

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