Anastasiia Lukovkina, Sara A. López-Paz, Céline Besnard, Laure Guenee, Fabian O. von Rohr* and Enrico Giannini,
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引用次数: 0
Abstract
The structurally related compounds NiI2 and CoI2 are multiferroic van der Waals materials in which helimagnetic orders exist simultaneously with electric polarization. Here, we report on the evolution of the crystal structure and of the magnetic properties across solid solution Co1–xNixI2. We have successfully grown crystals of the whole range of the solid solution, i.e., x = 0–1, by employing the self-selecting vapor growth (SSVG) technique and by carefully tuning the synthesis conditions according to the chemical composition. Our structural investigations show that the crystal symmetry changes from P3̅m1 to R3̅m when Ni substitutes for Co beyond x = 0.2. Both the lattice parameters and magnetic properties evolve continuously and smoothly from one end member to the other, showing that they can be finely tuned by the chemical composition. We also observe that the degree of Ni substitution in the solid solution affects the metamagnetic transition typical for CoI2 at high magnetic fields. In particular, we find the existence of a metamagnetic transition similar to that for CoI2 in the NiI2 structure. Based on magnetic measurements, we construct the phase diagram of the Co1–xNixI2 system. Controlling the magnetic properties by the chemical composition may open new pathways for the fabrication of electronic devices made of two-dimensional (2D) flakes of multiferroic van der Waals materials.
期刊介绍:
The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.