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Magnetochemistry
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Article

Ni50Mn37.5Sn12.5 Heusler Alloy: Influence of Co Addition on the Structure, Martensitic Transition, and Magnetic Properties

by
Ahlem Bekhouche
1,2,
Safia Alleg
2,
Karima Dadda
2,
Benilde F. O. Costa
3,
Asma Wederni
1 and
Joan-Josep Suñol
1,*
1
Department of Physics, University of Girona, Campus Montillivi, 17071 Girona, Spain
2
Laboratory of Magnetism and Spectroscopy of Solids, Physics Department, Badji Mokhtar Annaba University, P.O.B. 12, Annaba 23000, Algeria
3
University of Coimbra, CFisUC, Physics Department, Rua Larga, 3004-516 Coimbra, Portugal
*
Author to whom correspondence should be addressed.
Magnetochemistry 2024, 10(8), 59; https://doi.org/10.3390/magnetochemistry10080059
Submission received: 12 July 2024 / Revised: 7 August 2024 / Accepted: 12 August 2024 / Published: 15 August 2024
(This article belongs to the Special Issue Advance of Magnetocaloric Effect and Materials)
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Abstract

The impact of Co-addition (x = 0, 2, 4, and 6 at. %) in the as-cast and annealed Ni50Mn37.5Sn12.5 Heusler alloy at 900 °C for 24 h on the microstructure, magnetic properties, and the martensitic transition was studied using X-ray diffraction (XRD), scanning electron microscopy, vibrating sample magnetometry, and differential scanning calorimetry. The crystal structure of as-cast samples consists of a 14M modulated martensite structure, a face-centered (FCC) γ phase, and a face-centered tetragonal (FCT) MnNi-type phase L10. The as-cast samples show a dendritic microstructure with different contrasts and non-uniform distribution. The annealed samples exhibit dual 14M and γ phases for the Co0 and Co2, but 14M + γ + MnNi for the Co4 and Co6. The appearance of the martensitic transformation in the annealed Co0 and Co2 samples can be due to the disappearance of the dendritic microstructure. The characteristic temperatures (martensite start, Ms; martensite finish, Mf; austenite start, As; and austenite finish, Af) decrease with Co addition. A ferromagnetic-like order exists at a lower temperature of 1.8 K for the as-cast and annealed samples and decreases at 300 K. The annealing increases the fraction of the AFM contributions at 300 K. The exchange bias values of the Co0, An-Co2, and An-Co6 are 146.7 Oe, 24 O2, and 32.6 Oe, respectively, at 300 K.
Keywords: Ni-Mn-Sn-Co Heusler alloys; crystal structure; martensitic transformation; magnetic properties; DSC Ni-Mn-Sn-Co Heusler alloys; crystal structure; martensitic transformation; magnetic properties; DSC

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MDPI and ACS Style

Bekhouche, A.; Alleg, S.; Dadda, K.; Costa, B.F.O.; Wederni, A.; Suñol, J.-J. Ni50Mn37.5Sn12.5 Heusler Alloy: Influence of Co Addition on the Structure, Martensitic Transition, and Magnetic Properties. Magnetochemistry 2024, 10, 59. https://doi.org/10.3390/magnetochemistry10080059

AMA Style

Bekhouche A, Alleg S, Dadda K, Costa BFO, Wederni A, Suñol J-J. Ni50Mn37.5Sn12.5 Heusler Alloy: Influence of Co Addition on the Structure, Martensitic Transition, and Magnetic Properties. Magnetochemistry. 2024; 10(8):59. https://doi.org/10.3390/magnetochemistry10080059

Chicago/Turabian Style

Bekhouche, Ahlem, Safia Alleg, Karima Dadda, Benilde F. O. Costa, Asma Wederni, and Joan-Josep Suñol. 2024. "Ni50Mn37.5Sn12.5 Heusler Alloy: Influence of Co Addition on the Structure, Martensitic Transition, and Magnetic Properties" Magnetochemistry 10, no. 8: 59. https://doi.org/10.3390/magnetochemistry10080059

APA Style

Bekhouche, A., Alleg, S., Dadda, K., Costa, B. F. O., Wederni, A., & Suñol, J.-J. (2024). Ni50Mn37.5Sn12.5 Heusler Alloy: Influence of Co Addition on the Structure, Martensitic Transition, and Magnetic Properties. Magnetochemistry, 10(8), 59. https://doi.org/10.3390/magnetochemistry10080059

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