Magnetic and structural studies in Nd-based metallic glasses
C P Wong; S H Aly; A Nazareth; K Gudimetta; B Dale; G C Hadjipanayis; C P Wong; Dept. of Phys., Kansas State Univ., Manhattan, KS, USA; S H Aly; Dept. of Phys., Kansas State Univ., Manhattan, KS, USA; A Nazareth; Dept. of Phys., Kansas State Univ., Manhattan, KS, USA; K Gudimetta; Dept. of Phys., Kansas State Univ., Manhattan, KS, USA; B Dale; Dept. of Phys., Kansas State Univ., Manhattan, KS, USA; G C Hadjipanayis; Dept. of Phys., Kansas State Univ., Manhattan, KS, USA
Журнал:
Journal of Physics D: Applied Physics
Дата:
1986-06-14
Аннотация:
Amorphous alloys with composition Nd<sub>100-x</sub>M<sub>x</sub> where M=Co or Fe and 25<or=x<or=75 were prepared by melt-spinning. AC and DC susceptibility measurements show that most of the Nd-Co alloys have magnetic ordering temperatures below room temperature while the Nd-Fe alloys have magnetic ordering temperatures around 480K. The coercivities at 4.2K in Nd-Co vary from 1.8 kOe in Nd<sub>50</sub>Co<sub>50</sub> to 6 kOe in Nd<sub>60</sub>Co<sub>40</sub>. The Nd-Fe alloys show a maximum in coercivity which is a function of temperature. A value of about 10 kOe is observed for Nd<sub>65</sub>Fe<sub>35</sub> at about 230K. DSC studies show that Nd-Co and Nd-Fe alloys have largely different crystallisation temperatures approximately 200 degrees C and 500 degrees C respectively. The coercivity is found to be strongly dependent on crystallisation.
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