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Title: High coercivity Dy substituted Nd-Fe-Co-B magnetic nanoparticles produced by mechanochemical processing
Authors: Zhong, Yaoying
Chaudhary, Varun
Tan, Xiao
Parmar, Harshida
Ramanujan, Raju Vijayaraghavan
Keywords: Engineering::Materials
Issue Date: 2018
Source: Zhong, Y., Chaudhary, V., Tan, X., Parmar, H. & Ramanujan, R. V. (2018). High coercivity Dy substituted Nd-Fe-Co-B magnetic nanoparticles produced by mechanochemical processing. Journal of Magnetism and Magnetic Materials, 475, 554-562.
Journal: Journal of Magnetism and Magnetic Materials
Abstract: (Nd1-xDyx)2(Fe,Co)14B magnetic nanoparticles, in a range of Dy content from 0 to 0.6, were synthesized by a mechanochemical process. The influence of Dy substitution on the crystal structure and magnetic properties were studied. With increasing Dy content, the coercivity of (Nd1-xDyx)2(Fe,Co)14B particles first doubled from 8.8 kOe (x = 0) to a high value of 17.8 kOe (x = 0.5), further increase of Dy content led to a slightly lower coercivity of 17.5 kOe (x = 0.6).(Nd0.8Dy0.2)2(Fe,Co)14B particles exhibited good thermal stability, with a thermal coefficient of remanence (α) of -0.053% and thermal coefficient of coercivity (β) of -0.348%. Reduced spin-reorientation temperatures (TSR) of 105 K – 115 K were observed for (Nd1-xDyx)2(Fe,Co)14B, for x in the range of 0 to 0.2, making these compositions more attractive for cryogenic applications. Detailed analysis of the temperature dependent magnetic properties revealed that coercivity was controlled by nucleation of reversed magnetic domains.
ISSN: 0304-8853
DOI: 10.1016/j.jmmm.2018.08.061
Rights: © 2018 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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