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Investigation of (Fe,Co)NbB-Based Nanocrystalline Soft Magnetic Alloys by Lorentz Microscopy and Off-Axis Electron Holography

Published online by Cambridge University Press:  18 November 2014

Changlin Zheng ,
Holm Kirmse ,
Jianguo Long ,
David E. Laughlin ,
Michael E. McHenry  and
Wolfgang Neumann
Changlin Zheng
Affiliation:
Institute of Physics, Humboldt University of Berlin, D-12489 Berlin, Germany
Holm Kirmse
Affiliation:
Institute of Physics, Humboldt University of Berlin, D-12489 Berlin, Germany
Jianguo Long
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
David E. Laughlin
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
Michael E. McHenry
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
Wolfgang Neumann*
Affiliation:
Institute of Physics, Humboldt University of Berlin, D-12489 Berlin, Germany Department of Chemistry, University of Oregon, Eugene, OR 97403, USA
*
*Corresponding author. wolfgang.neumann@physik.hu-berlin.de
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Abstract

The relationship between microstructure and magnetic properties of a (Fe,Co)NbB-based nanocrystalline soft magnetic alloy was investigated by analytical transmission electron microscopy (TEM). The microstructures of (Fe0.5Co0.5)80Nb4B13Ge2Cu1 nanocrystalline alloys annealed at different temperatures were characterized by TEM and electron diffraction. The magnetic structures were analyzed by Lorentz microscopy and off-axis electron holography, including quantitative measurement of domain wall width, induction, and in situ magnetic domain imaging. The results indicate that the magnetic domain structure and particularly the dynamical magnetization behavior of the alloys strongly depend on the microstructure of the nanocrystalline alloys. Smaller grain size and random orientation of the fine particles decrease the magneto-crystalline anisotropy and suggests better soft magnetic properties which may be explained by the anisotropy model of Herzer.

Keywords

TEMelectron holographyLorentz microscopysoft magnetic alloynanocrystalline
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 21 , Issue 2 , April 2015 , pp. 498 - 509
Copyright
© Microscopy Society of America 2014 

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Footnotes

†

Current address: Monash Centre for Electron Microscopy, Monash University, Victoria 3800, Australia

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