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Processing and Hard Magnetic Properties of Nanocrystalline Sm(Co,Zr)7 Magnet Powders

Published online by Cambridge University Press:  17 March 2011

H. Tang ,
J. Zhou ,
Y. Liu  and
D.J. Sellmyer
H. Tang
Affiliation:
Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0113 Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68588-0113
J. Zhou
Affiliation:
Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0113 Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68588-0113
Y. Liu
Affiliation:
Department of Mechanical Engineering, University of Nebraska, Lincoln, NE 68588-0113 Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68588-0113
D.J. Sellmyer
Affiliation:
Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0113 Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68588-0113
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Abstract

Isotropic nanocrystalline Sm(Co,Zr)7 permanent magnet powders of the TbCu7 type structure and with high coercivity and enhanced remanent magnetization has been synthesized by mechanically milling Sm12.5Co87.5-xZrx alloys (x = 0, 1, 2, 3) alloys and subsequently appropriate annealing. The mechanical-milling process of the alloys and the formation of nanostructured Sm(Co,Zr)7 magnet powders have been investigated with respect to hard magnetic properties. Hard magnetic properties are found to be strongly dependent upon the processing condition (like milling time, annealing temperature, etc.). Optimal coercivity Hci of value above 21 kOe has been obtained in Sm12.5Co85.5Zr2 magnet powders subjected to milling for 5 hr and annealing at 600°C for 20min. Optimal remanent magnetization Mr of 73.4 emu/g, remanence ratio Mr/Ms of 0.71, and maximum energy products (BH)max of over 13 MGOe have been realized in Sm12.5Co87.5-xZrx (x = 1, 2) magnet powders with grain size of 15-20 nm. The hard magnetic properties are ascribed to the nanosized Sm(Co,Zr)7 phase of the TbCu7 type structure with grain size of 10-20 nm. The enhancement of remanent magnetization may be contributed from the enhanced exchange-coupling interaction between nanosized grains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L8.4
Copyright
Copyright © Materials Research Society 2001

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