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Effects of thermomagnetic treatments on the magnetism of Cu–Al–Mn alloys

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Abstract

Measurements of the magnetic properties of Cu–Al–Mn alloys are presented. We studied three alloys with compositions of the DO3 + L21 two-phase field occurring at low temperatures. In all studied alloys, annealing at intermediate temperatures promotes the development of magnetic properties due to the formation of ferromagnetic L21 particles in a paramagnetic DO3 matrix. The evolution of magnetization with temperature was measured. Upon heating, the magnetization disappears, which is due to demagnetization and dissolution of the L21 precipitates. After subsequent cooling, the Mn-rich alloys regain some magnetization, while the sample with the lowest Mn content has very low magnetization. The magnetic hysteresis measurements show that after cooling, the saturation magnetization decreases and the coercive field increases. The application of an external magnetic field during cooling appears to change the volume fraction and size of the L21 precipitates. The results concerning the formation of the L21 ferromagnetic phase by spinodal decomposition and its demagnetization and dissolution at temperatures above the miscibility gap are discussed. The differences found after the two thermomagnetic treatments are related to the possibility of different kinetics for each composition and to heat treatments with and without applied magnetic fields.

Graphical abstract

Magnetization as a function of temperature and applied field for Cu-25 at % Al-8 at % Mn

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Acknowledgments

The authors thank the Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA) and Consejo Nacional de Actividades Científicas y Técnicas (CONICET), PIP N° 2859, for the necessary funding to carry out this study.

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Authors and Affiliations

  1. Facultad de Ciencias Exactas, Universidad Nacional del Centro de La Provincia de Buenos Aires (UNCPBA), Pinto 399, 7000, Tandil, Bs. As., Argentina

    Diego Velázquez, Marcos A. E. Chaparro, Facundo Arriaga & Fernando Lanzini

  2. Instituto de Física de Materiales Tandil (IFIMAT), Pinto 399, 7000, Tandil, Bs. As., Argentina

    Diego Velázquez, Facundo Arriaga & Fernando Lanzini

  3. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), 2290, Godoy Cruz, CABA, Argentina

    Diego Velázquez, Facundo Arriaga & Fernando Lanzini

  4. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CIFICEN), Tandil, Argentina

    Marcos A. E. Chaparro

  5. Centro de Geociencias - UNAM, Boulevard Juriquilla No. 3001, 76230, Querétaro, Mexico

    Harald N. Böhnel

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  1. Diego Velázquez
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  2. Marcos A. E. Chaparro
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  3. Facundo Arriaga
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  4. Harald N. Böhnel
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  5. Fernando Lanzini
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Correspondence to Fernando Lanzini.

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Velázquez, D., Chaparro, M.A.E., Arriaga, F. et al. Effects of thermomagnetic treatments on the magnetism of Cu–Al–Mn alloys. MRS Advances 9, 45–50 (2024). https://doi.org/10.1557/s43580-023-00626-x

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