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Room-Temperature Ferromagnetism in Mg1-Mn2+As2 with Layered Structure
Xiao-Cun Liu1, Min Zhu2,3, Sheng-Qing Xia2
1School of Civil Engineering, Shandong Jiaotong University, Jinan, Shandong 250023, People's Republic of China.
Inorganic Chemistry
|August 27, 2021
Summary
New Mg/Mn arsenide compounds exhibit unique magnetic properties, including room-temperature ferromagnetism and coexisting ferromagnetic and antiferromagnetic interactions, confirmed by experimental and theoretical studies.
Area of Science:
- Materials Science
- Solid State Physics
- Magnetism
Background:
- Intermetallic compounds with mixed cation sites offer opportunities for novel magnetic behaviors.
- Understanding the interplay between crystal structure and magnetic properties is crucial for materials design.
Purpose of the Study:
- To synthesize and characterize Mg/Mn mixed intermetallic compounds Mg1-xMn2+xAs2.
- To investigate the magnetic properties and underlying interactions in these novel materials.
- To correlate structural features with observed magnetic phenomena.
Main Methods:
- Metal flux reactions for synthesis of single crystals.
- Single-crystal X-ray diffraction for structural analysis.
- Magnetic susceptibility measurements (zero-field-cooling and field-cooling).
- Magnetic hysteresis loop measurements.
- Spin-polarized density functional theory (DFT) calculations.
Main Results:
- Successful synthesis of Mg1-xMn2+xAs2 (x = 0.17, 0.48, 0.69) with CaAl2Si2-type structure.
- Observed divergence in magnetic susceptibilities indicating complex magnetic ordering.
- Evidence of room-temperature ferromagnetism in Mg0.31(2)Mn2.69As2.
- Demonstrated exchange bias behavior, suggesting coexistence of ferromagnetic (FM) and antiferromagnetic (AFM) interactions.
- DFT calculations validated the experimental magnetic ground state.
Conclusions:
- The synthesized Mg/Mn arsenides possess unique crystal structures leading to complex magnetic behaviors.
- These materials exhibit both ferromagnetism and antiferromagnetism, with potential for tunable magnetic properties.
- Experimental and theoretical approaches confirm the intricate magnetic interactions within these intermetallic compounds.
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