Abstract
Nanocomposite permanent magnetic materials based on Nd-Fe-B alloys with a low Nd content are a new type of permanent magnetic material. The microstructure of these nanocomposite permanent magnets is composed of a mixture of magnetically soft and hard phases providing the so called exchange coupling effect. Beside the optimization process parameters, methods of characterization have a very important role in the design of an optimal magnetic matrix of multiphase melt-spun Nd-Fe-B alloys. Different methods and techniques of characterization were used for observation and study of the microstructure evolution during crystallization. A summary results of measurements using different methods of characterization are presented to enable a better insight into relations between the microstructure and magnetic properties of the investigated melt-spun Nd-Fe-B alloys. .
Highlights
The interest in researching nanostructural permanent magnetic materials of rare-earthtransition-metals-type has been accelerated and especially stimulated by an exceptional progress in materials synthesis and new methods and techniques of characterization
This multiphase magnetic material is the result of the crystallization process of melt-spun Nd-Fe-B amorphous alloys with a low Nd content
There are many different research attempts aimed at improving the magnetic properties of this type of nanocomposite magnetic materials, with the methods and techniques of characterization being crucial for crystallization process and its directing towards optimal composition of nanocomposite materials which results in high magnetic properties
Summary
The interest in researching nanostructural permanent magnetic materials of rare-earthtransition-metals-type has been accelerated and especially stimulated by an exceptional progress in materials synthesis and new methods and techniques of characterization. The activities in this research area are directed towards nanocomposite permanent magnetic NdFe-B materials that are composed out of two phases, the hard magnetic one and the soft magnetic one, with the exchange coupling effect existing between them. This multiphase magnetic material is the result of the crystallization process of melt-spun Nd-Fe-B amorphous alloys with a low Nd content. There are many different research attempts aimed at improving the magnetic properties of this type of nanocomposite magnetic materials, with the methods and techniques of characterization being crucial for crystallization process and its directing towards optimal composition of nanocomposite materials which results in high magnetic properties
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