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Analysis of Magnetization Processes in Nanocomposite Hard Magnetic Materials from Macroscopic Magnetic Measurements and X-RAY Magnetic Circular Dichroism

Published online by Cambridge University Press:  21 February 2011

Stéphane David ,
Kenneth Mackay ,
Marlio Bonfim ,
Stefania Pizzii ,
Alain Fontaine  and
Dominique Givord
Stéphane David
Affiliation:
Laboratoire Louis Néel-CNRS, BP 166, 38042 Grenoble Cedex 9, Francedavid@labs.polycnrs-gre.fr
Kenneth Mackay
Affiliation:
Laboratoire Louis Néel-CNRS, BP 166, 38042 Grenoble Cedex 9, France
Marlio Bonfim
Affiliation:
Laboratoire Louis Néel-CNRS, BP 166, 38042 Grenoble Cedex 9, France
Stefania Pizzii
Affiliation:
Laboratoire Louis Néel-CNRS, BP 166, 38042 Grenoble Cedex 9, France
Alain Fontaine
Affiliation:
Laboratoire Louis Néel-CNRS, BP 166, 38042 Grenoble Cedex 9, France
Dominique Givord
Affiliation:
Laboratoire Louis Néel-CNRS, BP 166, 38042 Grenoble Cedex 9, France
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Abstract

A series of RExTMbalBy (3≤x≤5.5, 15≤y≤25 at%) nanocomposite magnets were prepared using the classical method of alloy rapid quenching and subsequent devitrification. Appropriate elemental additions and substitutions allowed the technical magnetic properties to be optimized. The analysis of the both hysteresis cycles and static susceptibility measurements in the range 20K-300K reveals that magnetization reversal in these materials can be interpreted schematically as a two-step process : the initial magnetization reversal is dominated by reversible processes while irreversible processes, which characterize the coercivity mechanism, occur at larger field values. To complement this study, X-Ray Magnetic Circular Dichroism (XMCD) spectroscopy was applied as an element-selective probe of magnetization reversal in nanocomposite samples. This allowed the hysteresis cycles of both hard and soft phases to be separated from the total cycle. Magnetization processes in these bulk heterogeneous systems are discussed in the light of information brought by the complementary applied experimental techniques.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999 , 175
Copyright
Copyright © Materials Research Society 1999

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References

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