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Effect of Iron Substitution on the High-temperature Properties of Sm(Co,Cu,Ti)z Permanent Magnets

Published online by Cambridge University Press:  21 March 2011

Jian Zhou ,
Ralph Skomski ,
David J. Sellmyer ,
Wei Tang  and
George C. Hadjipanayis
Jian Zhou
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and AnalysisUniversity of Nebraska, Lincoln, NE 68588
Ralph Skomski
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and AnalysisUniversity of Nebraska, Lincoln, NE 68588
David J. Sellmyer
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and AnalysisUniversity of Nebraska, Lincoln, NE 68588
Wei Tang
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark, DE 19716
George C. Hadjipanayis
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark, DE 19716
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Abstract

Recently, Ti-substituted Sm-Co permanent magnets have attracted renewed attention due to their interesting high-temperature coercivity. Our presentation deals with the effect of iron substitutions on the magnetic properties of the materials. X-ray diffraction shows that the investigated Sm(Co,Fe,Cu,Ti)z materials (z = 7.0 - 7.6) are two-phase magnets, consisting of 1:5 and 2:17 regions. The iron content affects both the coercivity and the magnetization. Depending on composition and heat treatment, some samples show a positive temperature coefficient of the coercivity in the temperature range from 22 °C to 550 °C. Moderate amounts of iron enhance the room-temperature coercivity. For example, the room-temperature coercivity of Sm(Co6.0Fe0.4Cu0.6Ti0.3) is 9.6 kOe, as compared to 7.6 kOe for Sm(Co6.4Cu0.6Ti0.3). At high temperatures, the addition of Fe has a deteriorating effect on the coercivity, which is as high as 10.0 kOe at 500 °C for Sm(Co6.4Cu0.6Ti0.3). The room-temperature magnetization increases on iron substitution, from 73 emu/g for Sm(Co6.4Cu0.6Ti0.3) to 78 emu/g for Sm(Co6.0Fe0.4Cu0.6Ti0.3). The observed temperature dependence is ascribed to the preferential dumbbell-site occupancy of the Fe atoms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , U2.3
Copyright
Copyright © Materials Research Society 2001

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References

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