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Magnetic Properties of Nanocrystalline Fe50Co50 Powders

Published online by Cambridge University Press:  01 February 2011

Shashishekar Basavaraju  and
Ian Baker
Shashishekar Basavaraju
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03748, U.S.A.
Ian Baker
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03748, U.S.A.
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Abstract

Nanocrystalline stoichiometric FeCo powders were prepared by mechanically alloying elemental Fe and Co powders using a high-energy ball mill. The microstructural evolution was studied as a function of milling time and subsequent annealing using X-ray diffractometry and differential scanning calorimetry. The magnetic behavior of the specimens was characterized using a vibrating sample magnetometer and a magnetic force microscope. A reduction in grain size coupled with an increase in coercivity was observed as function of milling time. The smallest grain size of 4 nm, which exhibited a coercivity of 122 Oe and magnetization of 2 T at room temperature, was obtained after 240 h of milling. The reduction in grain size during milling was not accompanied by enhanced soft magnetic properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 788: Symposium L – Continuous Nanophase and Nanostructured Materials , 2003 , L3.13
Copyright
Copyright © Materials Research Society 2004

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References

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