Abstract
We report on the effect of the nitrogen to rare earth (N2/RE) flux ratio on the structural, transport, and magnetic properties of samarium nitride (SmN) and dysprosium nitride (DyN) thin films. Both materials display a reduced lattice constant when the N2/RE flux ratio decreases, i.e., with increased nitrogen vacancies (VN) concentration. The films show several orders of magnitude increase in the electrical resistivity with increased N2/RE flux ratio. Finally, magnetic measurements on DyN films display a deviation from the free ion moment at low temperature, which is eased in more conductive films. This was interpreted as a further reduction in the quenching of the orbital angular momentum caused by the increased VN concentration. The Curie temperature was also found to increase with VN.
Highlights
Ferromagnetic samarium nitride (SmN) does show a nearly zero magnetization.7–11 As described below the ambient-temperature moment in dysprosium nitride (DyN) is close to the Hund’s rules value, though crystal field effects reduce it as one approaches the ferromagnetic phase
FIG. 1. 2θ-θ x-ray diffraction (XRD) diffractograms of the 111 peaks for samarium nitride (SmN) thin film grown under different N2/Sm flux ratio
We report on the influence of the N2/RE flux ratio, and the consequent VN concentration, on the structural, transport, and magnetic properties of SmN and dysprosium nitride (DyN) thin films
Summary
Ferromagnetic SmN does show a nearly zero magnetization.7–11 As described below the ambient-temperature moment in DyN is close to the Hund’s rules value, though crystal field effects reduce it as one approaches the ferromagnetic phase. We report on the influence of the N2/RE flux ratio, and the consequent VN concentration, on the structural, transport, and magnetic properties of SmN and DyN thin films.
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