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Improving the ferromagnetic exchange coupling in hard τ-Mn53.3Al45.0C1.7 and soft Mn50B50 magnetic alloys

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Abstract

To improve the magnetic properties of the hard-magnetic phase \(\tau \)-Mn53.3Al45.0C1.7, it was mixed with different quantities of the soft magnetic phase Mn50B50 and annealed at different temperatures. Micrometric powders of the τ phase and the soft magnetic phase were mixed using solid-state procedures. The resulting magnetic properties were as follow: for the hard phase was saturation magnetization of Ms = 38.22 Am2kg−1 at 1.8 T, remanent magnetization of Mr = 20.10 Am2kg−1, coercive force of μ0Hc = 0.378 T, and maximum energy product of (BH)max = 3.09 kJm−3, and for the soft phase was Ms = 85.51 Am2kg−1 and a μ0Hc = 0.018 T. After the preparation of different compositions of the mixture, and their annealing at different temperatures, it was concluded that the sample MnAlC/MnB with 2 wt.% of MnB phase annealed at 400 ℃ is the best one. Its magnetic properties were Ms = 68.82 Am2kg−1 at 3.0 T, Mr = 36.26 Am2kg−1, μ0Hc = 0.373 T and (BH)max = 9.79 kJ m−3 which displays an improvement of about 7 kJ m−3 when compared to the original τ phase. Therefore, these magnetic properties are better than those shown by the pure τ phase. These properties were improved more when the sample was previously aligned and measured in parallel to the applied field.

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Acknowledgements

Research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-19-2-0030. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. Part of the research was also sponsored by COLCIENCIAS under Contract 110671250407. Also, part of this research was sponsored by Universidad del Valle under the project with CI 71181. The authors would like to thank Dr. Anit Giri, from the U.S. Army Research Laboratory for a critical discussion of the results.

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Authors and Affiliations

  1. Departamento de Física, Universidad del Valle, Meléndez, A.A. 25360, Cali, Colombia

    H. Martínez Sánchez, L. E. Zamora Alfonso & G. A. Pérez Alcázar

  2. Centro de Excelencia en Nuevos Materiales (CENM), Universidad del Valle, Meléndez, A.A. 25360, Cali, Colombia

    L. E. Zamora Alfonso & G. A. Pérez Alcázar

  3. Facultad de Ciencias Naturales Y Matemáticas, Universidad de Ibagué, Ibagué, Colombia

    J. S. Trujillo Hernandez

  4. BCMaterials, Bizkaia Science and Technology Park, 48160, Derio, Spain

    D. Salazar

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Sánchez, H.M., Alfonso, L.E.Z., Hernandez, J.S.T. et al. Improving the ferromagnetic exchange coupling in hard τ-Mn53.3Al45.0C1.7 and soft Mn50B50 magnetic alloys. Appl. Phys. A 126, 843 (2020). https://doi.org/10.1007/s00339-020-04025-z

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