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Influence of proton irradiation on the magnetic properties of two-dimensional Ni(II) molecular magnet

2023; Nature Portfolio; Volume: 13; Issue: 1 Linguagem: Inglês

10.1038/s41598-023-41156-8

2045-2322

Dominik Czernia, Piotr Konieczny, Ewa Juszyńska‐Gałązka, Marcin Perzanowski, Janusz Lekki, Anabel Berenice González Guillén, Wiesław Łasocha,

Lanthanide and Transition Metal Complexes

Abstract The influence of 1.9 MeV proton irradiation on structural and magnetic properties has been explored in the two-dimensional (2D) NiSO 4 (1,3-phenylenediamine) 2 coordination ferrimagnet. The X-ray powder diffraction and IR spectroscopy revealed that the octahedrons with Ni ion in the center remain unchanged regardless of the fluence a sample received. In contrast, proton irradiation greatly influences the hydrogen bonds in the flexible parts in which the 1,3-phenylenediamine is involved. Dc magnetic measurements revealed that several magnetic properties were modified with proton irradiation. The isothermal magnetization measured at T = 2.0 K varied with the proton dose, achieving a 50% increase in magnetization in the highest measured field µ 0 H dc = 7 T or a 25% decrease in remanence. The most significant change was observed for the coercive field, which was reduced by 90% compared to the non-irradiated sample. The observed results are accounted for the increased freedom of magnetic moments rotation and the modification of intralayer exchange couplings.