Fizika Tverdogo Tela, 2025 Volume 67, Issue 9,Pages 1700–1705(Mi ftt12256)
Magnetism, spintronics
Magnetic properties of Co$^{3+}$Ni$^{2+}_{0.33}$Co$^{2+}_{1.67}$BO$_5$ and Co$^{3+}$Ni$^{2+}_{0.59}$Co$^{2+}_{1.41}$BO$_5$ crystals with the ludwigites structure
Abstract:
The studied solid solutions Co$^{3+}$Ni$^{2+}_{0.33}$Co$^{2+}_{1.67}$BO$_5$ and Co$^{3+}$Ni$^{2+}_{0.59}$Co$^{2+}_{1.41}$BO$_5$ are ferrimagnets with magnetic transition temperatures of 46 and 48 K, respectively. Substitution of nickel ions for divalent cobalt ions in ludwigite Co$_3$BO$_5$ has virtually no effect on the magnetic properties: temperature, magnetic crystallization, and the same characteristics, temperature dependences, and field dependences of magnetization, corresponding to the cm$^{-1}$ behavior of magnetization in Co$_3$BO$_5$, are identical. Trivalent cobalt ions likely remain in a low-spin state, and the nature of the exchange interactions of magnetic ions remains unchanged.
Keywords:ludwigites, magnetic phase transition, indirect exchange interactions.
Fulltext:
PDF file (805 kB)