Advanced Nanocomposite Magnets with the L10 Phase

Dear Colleagues,

Rare-earth-free permanent magnets with the L1₀ phase are actively researched for their potential as a future class of magnetic materials capable of operating at higher temperatures and in challenging corrosion environments, such as for renewable energy applications. Among these classes, novel magnets fabricated without rare earth materials show promising potential, being cost-effective with interesting magnetic properties. Sustained efforts are currently being made in the search for new classes of magnets, a search that is motivated by the continuous depletion of RE oxide resources and the need for improved magnetic parameters, especially for high-temperature applications. Indeed, RE-free magnets can operate under extreme conditions such as high temperatures and corrosive media, for instance in wind turbine motors subjected to strong variations in temperature and humidity. Various possible RE-free magnets have been proposed and largely investigated, including compounds derived from the binary systems FePt, MnAl, MnBi, MnGa, and others. Common to all these different systems is the fact that they all may exhibit, under certain conditions, the formation of the tetragonal L1₀ phase, which has been shown to present large magneto-crystalline anisotropy and high coercivity.

The motivation of this Special Issue is that the research community has already begun searching for magnetic materials based on abundant elements that are less costly and easier to process without a significant degradation in the magnetic performances of current classes of rare earth magnets.

The present Special Issue will address all the challenges encountered in developing novel RE-free nanocomposite magnets, including, but not limited to, the following:

• The theory and modeling of novel magnetic alloy compositions;
• Synthesis challenges and microstructure optimization for novel nanocomposite magnets;
• Magnetic phase coexistence and phase stability with temperature;
• Hard–soft exchange coupling in multiphase magnetic nanocomposites;
• The optimization of magnetic performances in RE-free nanocomposite magnets;
• Magnetic performances under extreme conditions of operation.

Dr. Ovidiu Crisan
Guest Editor

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• RE-free nanocomposite magnets
• hard-soft exchange coupling
• magnetic stability
• structural phase transformation
• L10 phase