Effect of Cu/Fe/Co substitution on static and dynamic magnetic properties of Ni-Mn-Sn alloy thin films

• Published in: Journal of magnetism and magnetic materials Vol. 464; pp. 50 - 55
• Main Authors: Modak, Rajkumar, Srinivasu, V.V., Srinivasan, A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.10.2018; Elsevier BV
• Subjects: Ambient temperature; Annealing; Atomic force microscopy; Cobalt; Copper; Damping; DC sputtering; Dependence; Ferroelectrics; Ferromagnetic materials; Ferromagnetic resonance; Gilbert damping; Heusler alloy; High vacuum; Iron; Magnetic anisotropy; Magnetic properties; Magnetic resonance; Magnetic saturation; Magnetron sputtering; Manganese; Nickel base alloys; Silicon substrates; Substitutes; Thickness; Thin film; Thin films; Tin; X-ray diffraction; Ferromagnetic resonance; Gilbert damping; Heusler alloy; DC sputtering; Thin film
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2018.05.050

•Single phase (L21) structured Ni-Mn-X-Sn films obtained on Si (1 0 0).•Substitution of X element enhanced soft magnetic property in films.•Substitution of fourth element decreased resonant linewidth at 9.44 GHz.•Ni-Mn-Co-Sn film showed very low Gilbert damping constant of 0.007. Cu or Fe or Co substituted off-stoichiometric Ni-Mn-Sn films of 500 nm thickness were deposited on Si (1 0 0) substrate by dc magnetron sputtering at ambient temperature and then annealed ex situ at 550 °C for 1 h under high vacuum. X-ray diffraction and atomic force microscopy analyses showed that the annealed films exhibited high degree of crystalline order with cubic L21 phase. Magneto-static evaluation of the films established room temperature ferromagnetic order with easy axis of magnetization along the film plane in all the annealed films. The ratio of magnetic resonance and magnetic saturation (Mr/Ms) increased drastically upon Co substitution. The analysis of polar angle dependence resonance field (Hr) and resonance linewidth (ΔH) measurement using resonant cavity FMR technique revealed the presence of negative effective perpendicular magnetic anisotropy (K1) and very low Gilbert damping constant (α) in all the films.