Compensated ferrimagnetism and compensation temperatures in Mn2-2xCo0.5+xV0.5+xGa Heusler alloys

• Published in: Journal of magnetism and magnetic materials Vol. 562
• Main Authors: Seredina, M.A., Karpenkov, D.Yu, Kolesnikov, E.A., Gorshenkov, M.V., Degtyarenko, A.Yu, Taskaev, S.V., Degtyarenko, P.N., Xu, Xiaoguang, Khovaylo, V.V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-11-2022
• Subjects: Compensated ferrimagnets; Compensation temperature; Heusler alloys; Mn2Co(V)Ga; Heusler alloys; Mn2Co(V)Ga; Compensation temperature; Compensated ferrimagnets
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2022.169808

•Magnetic properties of Mn2-2xCo0.5+xV0.5+xGa (x = 0, 0.1, 0.2, 0.25, 0.3, 0.4, 0.5) were studied.•Curie temperature decreases from 634 to 122 K with decreasing Mn content.•The fully compensated ferrimagnetic state was attained in Mn1.6Co0.7V0.7Ga and Mn1.2Co0.9V0.9Ga alloys.
Melt spun ribbons of Heusler alloys Mn2-2xCo0.5+xV0.5+xGa (x = 0, 0.1, 0.2, 0.25, 0.3, 0.4, 0.5) with 24 valence electrons were synthesized. Curie temperature decreases from 634 to 122 K with decreasing Mn content. Fully compensated ferromagnetic state was achieved for the x = 0.2 and x = 0.4 compositions. The compensation temperature, determined from the Hall resistivity measurements, was found to be ∼130 K for the Mn1.6Co0.7V0.7Ga composition and ∼317.5 K for the Mn1.2Co0.9V0.9Ga composition. Besides, a kink on the magnetization curves of the x = 0–0.4 compounds, observed at T ≈ 70 K, was suggested to be presumably due to a spin-reorientation transition.