High coercivity Dy substituted Nd-Fe-Co-B magnetic nanoparticles produced by mechanochemical processing

Y. Zhong; V. Chaudhary; X. Tan; H. Parmar; R. V. Ramanujan

doi:10.1016/j.jmmm.2018.08.061

High coercivity Dy substituted Nd-Fe-Co-B magnetic nanoparticles produced by mechanochemical processing

Y. Zhong, V. Chaudhary, X. Tan, H. Parmar, R. V. Ramanujan^*

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

(Nd_1-xDy_x)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 (Nd_1-xDy_x)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). (Nd_0.8Dy_0.2)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 (T_SR) of 105 K – 115 K were observed for (Nd_1-xDy_x)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.

Original language	English
Pages (from-to)	554-562
Number of pages	9
Journal	Journal of Magnetism and Magnetic Materials
Volume	475
DOIs	https://doi.org/10.1016/j.jmmm.2018.08.061
Publication status	Published - Apr 1 2019
Externally published	Yes

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Publisher Copyright:
© 2018 Elsevier B.V.

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "High coercivity Dy substituted Nd-Fe-Co-B magnetic nanoparticles produced by mechanochemical processing",

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.",

author = "Y. Zhong and V. Chaudhary and X. Tan and H. Parmar and Ramanujan, \{R. V.\}",

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year = "2019",

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doi = "10.1016/j.jmmm.2018.08.061",

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T1 - High coercivity Dy substituted Nd-Fe-Co-B magnetic nanoparticles produced by mechanochemical processing

AU - Zhong, Y.

AU - Chaudhary, V.

AU - Tan, X.

AU - Parmar, H.

AU - Ramanujan, R. V.

PY - 2019/4/1

Y1 - 2019/4/1

N2 - (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.

AB - (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.

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High coercivity Dy substituted Nd-Fe-Co-B magnetic nanoparticles produced by mechanochemical processing

Abstract

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