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Study of Structural and Magnetic Properties of Pd-Doped Co4N Thin Films
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Study of Structural and Magnetic Properties of Pd-Doped Co4N Thin Films
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Journal Article
Study of Structural and Magnetic Properties of Pd-Doped Co4N Thin Films
2025
Overview
Tetra metal nitrides (M
4
N; M = Cr, Fe, Co, Mn, Ni) are a promising spintronic material with an anti-perovskite structure and fascinating magnetic characteristics due to a magneto-volume effect. Though a fully stochiometric Mn
4
N or Fe
4
N has been achieved, the lattice parameter (LP) of Co
4
N was always been found to be significantly lower than the anticipated theoretical values, indicating a sub-stochiometric Co
4
N phase. The formation enthalpy of Co
4
N is slightly positive resulting in unfavorable thermodynamical conditions and significant out-diffusion of N from Co
4
N. In this work, we present a comparative study of undoped and Pd-doped Co
4
N thin films synthesized using a reactive nitrogen sputtering. The structural, composition, and magnetic properties have been studied by combining x-ray diffraction, Rutherford backscattering, energy-dispersive x-ray spectroscopy, secondary ion mass spectroscopy, vibrating sample magnetometer, magneto-optical Kerr effect, and polarized neutron reflectivity measurements. It was found that Pd doping of about 5 at.% results in a significant enhancement in the LP of Co
4
N signifying a higher amount of N retention without adversely affecting the growth and magnetic properties. It is further suggested that the amount of Pd doping may further be increased to realize a fully stoichiometric Co
4
N.
Publisher
Springer US,Springer Nature B.V
