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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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High-Coercivity Spin Glasses in Anisotropic Mo2FeB2-Type M1.5Mn1.5B2 (M = Mo, W)
Shola E Adeniji1, Alexei A Belik2, Takao Mori2,3
1Department of Chemistry, University of California, Riverside, California 92521, United States.
Journal of the American Chemical Society
|October 27, 2025
Summary
New magnetic materials, Mo1.5Mn1.5B2 and W1.5Mn1.5B2, exhibit spin-glass behavior combined with high coercivity. These findings pave the way for advanced multifunctional materials with unique magnetic properties.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Magnetism
Background:
- Magnetic materials with both spin-glass behavior and hard-magnet properties are crucial for advanced applications.
- The Mo2FeB2-type structure is known for its robust structural characteristics and potential as an altermagnetic material.
Purpose of the Study:
- To synthesize and characterize novel magnetic materials in the Mo2FeB2-type structure.
- To investigate the coupling between spin-glass behavior and hard-magnet coercivity in these materials.
- To explore the underlying magnetic interactions and anisotropy using experimental and computational methods.
Main Methods:
- Solid-state synthesis route to achieve single-phase Mo1.5Mn1.5B2 and W1.5Mn1.5B2.
- Temperature-dependent and AC susceptibility measurements to probe magnetic transitions and spin dynamics.
- Density Functional Theory (DFT) calculations to determine magnetic interactions and magnetocrystalline anisotropy.
Main Results:
- Mo1.5Mn1.5B2 shows spin-glass behavior (Tg = 29 K) with high coercivity (Hc = 302.4 kA/m).
- W1.5Mn1.5B2 exhibits reentrant cluster spin glass behavior (Tg = 43 K) and a ferromagnetic transition (70 K) with coercivity (Hc = 175.1 kA/m).
- DFT calculations reveal competing FM/AFM interactions and uniaxial MAE favoring the c-axis, correlating with experimental observations.
Conclusions:
- The Mo2FeB2-type structure can host materials with combined spin-glass and hard-magnet properties.
- Mo1.5Mn1.5B2 and W1.5Mn1.5B2 represent promising multifunctional magnetic materials.
- These findings expand the application scope of Mo2FeB2-type materials beyond structural uses.
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