Relation between structure and magnetic properties of Nd2(Fe, Co, Mo)14B/α-Fe nanocomposite magnets

B. Z. Cui; X. K. Sun; L. Y. Xiong; S. T. Cao; X. X. Zhang; W. Liu; D. Y. Geng; Z. D. Zhang

doi:10.1016/S0925-8388(02)00014-2

Relation between structure and magnetic properties of Nd₂(Fe, Co, Mo)₁₄B/α-Fe nanocomposite magnets

B. Z. Cui, X. K. Sun, L. Y. Xiong, S. T. Cao, X. X. Zhang, W. Liu, D. Y. Geng, Z. D. Zhang

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

20 Scopus citations

Abstract

The relationship between nanostructure, exchange coupling and magnetic properties of Nd₂(Fe, Co, Mo)₁₄B/α-Fe nanocomposite magnets prepared by mechanical alloying (MA) has been studied systematically. Different categories of grain interfaces have been directly observed, which correspond to different types of exchange couplings in the Nd₂Fe₁₄B/α-Fe-type nanocomposite magnets. The notable decrease of the spin-reorientation temperature T_sr of Nd₂Fe₁₄B phase convincingly demonstrates the presence of strong inter-grain exchange coupling in the Nd₂Fe₁₄B/α-Fe-type nanocomposites. For as-annealed Nd_8.4Fe_87.1-xMo_xB_4.5 (x = 0, 0.6, 1.1 and 1.6) and Nd_8.4Fe_80.4Co_5.6Mo_1.1B_4.5 alloys, the intrinsic coercivity μ₀H_c and the maximum magnetic energy product (BH)_max are remarkably improved in the alloys with only Mo-additions as well as in the Nd_8.4Fe_80.4Co_5.6Mo_1.1B_4.5 alloy. The improvement of the magnetic properties is the result of an enhancement of the exchange coupling, because of the modifications of nanostructural factors and phase components by a proper substitution of 3d elements for Fe.

Original language	English (US)
Pages (from-to)	242-251
Number of pages	10
Journal	Journal of Alloys and Compounds
Volume	340
Issue number	1-2
DOIs	https://doi.org/10.1016/S0925-8388(02)00014-2
State	Published - Jun 26 2002
Externally published	Yes

Keywords

Mechanical alloying TEM
Mössbauer spectroscopy
Nanostructured materials
Permanent magnets

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/S0925-8388(02)00014-2

Cite this

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title = "Relation between structure and magnetic properties of Nd2(Fe, Co, Mo)14B/α-Fe nanocomposite magnets",

abstract = "The relationship between nanostructure, exchange coupling and magnetic properties of Nd2(Fe, Co, Mo)14B/α-Fe nanocomposite magnets prepared by mechanical alloying (MA) has been studied systematically. Different categories of grain interfaces have been directly observed, which correspond to different types of exchange couplings in the Nd2Fe14B/α-Fe-type nanocomposite magnets. The notable decrease of the spin-reorientation temperature Tsr of Nd2Fe14B phase convincingly demonstrates the presence of strong inter-grain exchange coupling in the Nd2Fe14B/α-Fe-type nanocomposites. For as-annealed Nd8.4Fe87.1-xMoxB4.5 (x = 0, 0.6, 1.1 and 1.6) and Nd8.4Fe80.4Co5.6Mo1.1B4.5 alloys, the intrinsic coercivity μ0Hc and the maximum magnetic energy product (BH)max are remarkably improved in the alloys with only Mo-additions as well as in the Nd8.4Fe80.4Co5.6Mo1.1B4.5 alloy. The improvement of the magnetic properties is the result of an enhancement of the exchange coupling, because of the modifications of nanostructural factors and phase components by a proper substitution of 3d elements for Fe.",

keywords = "Mechanical alloying TEM, M{\"o}ssbauer spectroscopy, Nanostructured materials, Permanent magnets",

author = "Cui, {B. Z.} and Sun, {X. K.} and Xiong, {L. Y.} and Cao, {S. T.} and Zhang, {X. X.} and W. Liu and Geng, {D. Y.} and Zhang, {Z. D.}",

year = "2002",

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T1 - Relation between structure and magnetic properties of Nd2(Fe, Co, Mo)14B/α-Fe nanocomposite magnets

AU - Cui, B. Z.

AU - Sun, X. K.

AU - Xiong, L. Y.

AU - Cao, S. T.

AU - Zhang, X. X.

AU - Liu, W.

AU - Geng, D. Y.

AU - Zhang, Z. D.

PY - 2002/6/26

Y1 - 2002/6/26

N2 - The relationship between nanostructure, exchange coupling and magnetic properties of Nd2(Fe, Co, Mo)14B/α-Fe nanocomposite magnets prepared by mechanical alloying (MA) has been studied systematically. Different categories of grain interfaces have been directly observed, which correspond to different types of exchange couplings in the Nd2Fe14B/α-Fe-type nanocomposite magnets. The notable decrease of the spin-reorientation temperature Tsr of Nd2Fe14B phase convincingly demonstrates the presence of strong inter-grain exchange coupling in the Nd2Fe14B/α-Fe-type nanocomposites. For as-annealed Nd8.4Fe87.1-xMoxB4.5 (x = 0, 0.6, 1.1 and 1.6) and Nd8.4Fe80.4Co5.6Mo1.1B4.5 alloys, the intrinsic coercivity μ0Hc and the maximum magnetic energy product (BH)max are remarkably improved in the alloys with only Mo-additions as well as in the Nd8.4Fe80.4Co5.6Mo1.1B4.5 alloy. The improvement of the magnetic properties is the result of an enhancement of the exchange coupling, because of the modifications of nanostructural factors and phase components by a proper substitution of 3d elements for Fe.

AB - The relationship between nanostructure, exchange coupling and magnetic properties of Nd2(Fe, Co, Mo)14B/α-Fe nanocomposite magnets prepared by mechanical alloying (MA) has been studied systematically. Different categories of grain interfaces have been directly observed, which correspond to different types of exchange couplings in the Nd2Fe14B/α-Fe-type nanocomposite magnets. The notable decrease of the spin-reorientation temperature Tsr of Nd2Fe14B phase convincingly demonstrates the presence of strong inter-grain exchange coupling in the Nd2Fe14B/α-Fe-type nanocomposites. For as-annealed Nd8.4Fe87.1-xMoxB4.5 (x = 0, 0.6, 1.1 and 1.6) and Nd8.4Fe80.4Co5.6Mo1.1B4.5 alloys, the intrinsic coercivity μ0Hc and the maximum magnetic energy product (BH)max are remarkably improved in the alloys with only Mo-additions as well as in the Nd8.4Fe80.4Co5.6Mo1.1B4.5 alloy. The improvement of the magnetic properties is the result of an enhancement of the exchange coupling, because of the modifications of nanostructural factors and phase components by a proper substitution of 3d elements for Fe.

KW - Mechanical alloying TEM

KW - Mössbauer spectroscopy

KW - Nanostructured materials

KW - Permanent magnets

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