Enhanced coercivity in thermally processed (Nd,Dy) (Fe,Co,Nb,B)5.5 α-Fe nanoscale multilayer magnets

W. Liu; X. Z. Li; J. P. Liu; X. K. Sun; C. L. Chen; R. Skomski; Z. D. Zhang; D. J. Sellmyer

doi:10.1063/1.1905788

Enhanced coercivity in thermally processed (Nd,Dy) (Fe,Co,Nb,B)5.5 α-Fe nanoscale multilayer magnets

W. Liu, X. Z. Li, J. P. Liu, X. K. Sun, C. L. Chen, R. Skomski, Z. D. Zhang, D. J. Sellmyer

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

7 Citations (Scopus)

Abstract

Structural and magnetic properties of laminated (Nd,Dy) (Fe,Co,Nb,B)5.5 Fe nanocomposites are investigated. Normally, the addition of the soft phase to the hard phase enhances the remanence but deteriorates the permanent-magnet performance of the material by reducing the coercivity. In the present system, the coercivity increases to 1608 kAm (20.2 kOe) in thermally processed Nd-Dy-Fe-Co-Nb-B (15 nm) Fe (4 nm) multilayered nanocomposites, which is higher than that of the single-layer hard-magnetic film. The abnormally high coercivity is achieved by annealing at relatively high temperature, which breaks the laminated structure of the as-deposited multilayer. A likely physical explanation of the enhanced coercivity is the introduction of the domain-wall pinning sites that counteract the inevitable decrease of the nucleation field.

Original language	English
Article number	104308
Journal	Journal of Applied Physics
Volume	97
Issue number	10
DOIs	https://doi.org/10.1063/1.1905788
Publication status	Published - 2005 May 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Enhanced coercivity in thermally processed (Nd,Dy) (Fe,Co,Nb,B)5.5 α-Fe nanoscale multilayer magnets",

abstract = "Structural and magnetic properties of laminated (Nd,Dy) (Fe,Co,Nb,B)5.5 Fe nanocomposites are investigated. Normally, the addition of the soft phase to the hard phase enhances the remanence but deteriorates the permanent-magnet performance of the material by reducing the coercivity. In the present system, the coercivity increases to 1608 kAm (20.2 kOe) in thermally processed Nd-Dy-Fe-Co-Nb-B (15 nm) Fe (4 nm) multilayered nanocomposites, which is higher than that of the single-layer hard-magnetic film. The abnormally high coercivity is achieved by annealing at relatively high temperature, which breaks the laminated structure of the as-deposited multilayer. A likely physical explanation of the enhanced coercivity is the introduction of the domain-wall pinning sites that counteract the inevitable decrease of the nucleation field.",

author = "W. Liu and Li, {X. Z.} and Liu, {J. P.} and Sun, {X. K.} and Chen, {C. L.} and R. Skomski and Zhang, {Z. D.} and Sellmyer, {D. J.}",

note = "Funding Information: This work has been supported by the U.S. NSF under Grant No. INT-9812082, NSF MRSEC, the U.S. DOE, the National Natural Science Foundation of China under Projects Nos. 50331030 and 50371085, and by the National 863 project under Grant No. 2002AA302603.",

year = "2005",

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doi = "10.1063/1.1905788",

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T1 - Enhanced coercivity in thermally processed (Nd,Dy) (Fe,Co,Nb,B)5.5 α-Fe nanoscale multilayer magnets

AU - Liu, W.

AU - Li, X. Z.

AU - Liu, J. P.

AU - Sun, X. K.

AU - Chen, C. L.

AU - Skomski, R.

AU - Zhang, Z. D.

AU - Sellmyer, D. J.

N1 - Funding Information: This work has been supported by the U.S. NSF under Grant No. INT-9812082, NSF MRSEC, the U.S. DOE, the National Natural Science Foundation of China under Projects Nos. 50331030 and 50371085, and by the National 863 project under Grant No. 2002AA302603.

PY - 2005/5/15

Y1 - 2005/5/15

N2 - Structural and magnetic properties of laminated (Nd,Dy) (Fe,Co,Nb,B)5.5 Fe nanocomposites are investigated. Normally, the addition of the soft phase to the hard phase enhances the remanence but deteriorates the permanent-magnet performance of the material by reducing the coercivity. In the present system, the coercivity increases to 1608 kAm (20.2 kOe) in thermally processed Nd-Dy-Fe-Co-Nb-B (15 nm) Fe (4 nm) multilayered nanocomposites, which is higher than that of the single-layer hard-magnetic film. The abnormally high coercivity is achieved by annealing at relatively high temperature, which breaks the laminated structure of the as-deposited multilayer. A likely physical explanation of the enhanced coercivity is the introduction of the domain-wall pinning sites that counteract the inevitable decrease of the nucleation field.

AB - Structural and magnetic properties of laminated (Nd,Dy) (Fe,Co,Nb,B)5.5 Fe nanocomposites are investigated. Normally, the addition of the soft phase to the hard phase enhances the remanence but deteriorates the permanent-magnet performance of the material by reducing the coercivity. In the present system, the coercivity increases to 1608 kAm (20.2 kOe) in thermally processed Nd-Dy-Fe-Co-Nb-B (15 nm) Fe (4 nm) multilayered nanocomposites, which is higher than that of the single-layer hard-magnetic film. The abnormally high coercivity is achieved by annealing at relatively high temperature, which breaks the laminated structure of the as-deposited multilayer. A likely physical explanation of the enhanced coercivity is the introduction of the domain-wall pinning sites that counteract the inevitable decrease of the nucleation field.

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Enhanced coercivity in thermally processed (Nd,Dy) (Fe,Co,Nb,B)5.5 α-Fe nanoscale multilayer magnets

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