Magnetic properties of mechanically milled Sm-Co permanent magnetic materials with the TbCu7 structure

Raphael Justin Joseyphus; Alwarramanujam Narayanasamy; Raghavan Gopalan; Venkatasubramanian Chandrasekaran; Balachandran Jeyadevan; Kazuyuki Tohji

doi:10.2320/matertrans.47.2264

Magnetic properties of mechanically milled Sm-Co permanent magnetic materials with the TbCu₇ structure

Raphael Justin Joseyphus, Alwarramanujam Narayanasamy, Raghavan Gopalan, Venkatasubramanian Chandrasekaran, Balachandran Jeyadevan, Kazuyuki Tohji

ENV - Environmental Studies for Advanced Society

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

8 Citations (Scopus)

Abstract

The magnetic properties of Sm(Co,Fe,Cu,Zr)₇ compound with the TbCu₇ structure are studied for the mechanically milled samples. The coercivity could be varied, without affecting the saturation magnetization, from 44 kA/m for the micron sized particles to 280kA/m by reducing the particle size to sub-micron size (600-900 nm) using high-energy ball milling. The enhancement in the coercivity is attributed to the particles approaching single domain size. The presence of dipolar coupling suggests that the grain sizes are well above the exchange length for the milled samples. The thermal measurements indicate that the compound with the TbCu₇ structure is not stable at high temperatures beyond 743 K.

Original language	English
Pages (from-to)	2264-2268
Number of pages	5
Journal	Materials Transactions
Volume	47
Issue number	9
DOIs	https://doi.org/10.2320/matertrans.47.2264
Publication status	Published - 2006 Sept

Keywords

Dipolar coupling
Mechanical milling
Permanent magnetic materials
TbCu structure

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.2320/matertrans.47.2264

Cite this

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title = "Magnetic properties of mechanically milled Sm-Co permanent magnetic materials with the TbCu7 structure",

abstract = "The magnetic properties of Sm(Co,Fe,Cu,Zr)7 compound with the TbCu7 structure are studied for the mechanically milled samples. The coercivity could be varied, without affecting the saturation magnetization, from 44 kA/m for the micron sized particles to 280kA/m by reducing the particle size to sub-micron size (600-900 nm) using high-energy ball milling. The enhancement in the coercivity is attributed to the particles approaching single domain size. The presence of dipolar coupling suggests that the grain sizes are well above the exchange length for the milled samples. The thermal measurements indicate that the compound with the TbCu7 structure is not stable at high temperatures beyond 743 K.",

keywords = "Dipolar coupling, Mechanical milling, Permanent magnetic materials, TbCu structure",

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AU - Joseyphus, Raphael Justin

AU - Narayanasamy, Alwarramanujam

AU - Gopalan, Raghavan

AU - Chandrasekaran, Venkatasubramanian

AU - Jeyadevan, Balachandran

AU - Tohji, Kazuyuki

PY - 2006/9

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N2 - The magnetic properties of Sm(Co,Fe,Cu,Zr)7 compound with the TbCu7 structure are studied for the mechanically milled samples. The coercivity could be varied, without affecting the saturation magnetization, from 44 kA/m for the micron sized particles to 280kA/m by reducing the particle size to sub-micron size (600-900 nm) using high-energy ball milling. The enhancement in the coercivity is attributed to the particles approaching single domain size. The presence of dipolar coupling suggests that the grain sizes are well above the exchange length for the milled samples. The thermal measurements indicate that the compound with the TbCu7 structure is not stable at high temperatures beyond 743 K.

AB - The magnetic properties of Sm(Co,Fe,Cu,Zr)7 compound with the TbCu7 structure are studied for the mechanically milled samples. The coercivity could be varied, without affecting the saturation magnetization, from 44 kA/m for the micron sized particles to 280kA/m by reducing the particle size to sub-micron size (600-900 nm) using high-energy ball milling. The enhancement in the coercivity is attributed to the particles approaching single domain size. The presence of dipolar coupling suggests that the grain sizes are well above the exchange length for the milled samples. The thermal measurements indicate that the compound with the TbCu7 structure is not stable at high temperatures beyond 743 K.

KW - Dipolar coupling

KW - Mechanical milling

KW - Permanent magnetic materials

KW - TbCu structure

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