Work

Unraveling the structural and magnetic characteristics of Mg doped CoCr2O4

Year: 2024

Type: article

Abstract: In this paper, we explore the structural and magnetic properties of Mg doped CoCr 2 O 4 nanopowder (typical size of 10 nm) synthesized via the sol–gel auto-combustion method. X-ray diffraction, XPS, and FTIR spectra confirm spinel structure (space group Fd-3 m ) with Mg 2+ doped at Cr 3+ . Interestingly, temperature-dependent magnetizations show various magnetic transitions between 5–300 K. While they show ferrimagnetic ordering below Curie temperature of 100 K (CoCr 2 O 4 ) to 80 K (CoCr 1.8 Mg 0.2 O 4 ) samples, the irreversibility between FC and ZFC curves at blocking temperature attribute to spin blocking nature of nanoparticles. Finally, at very low temperatures (13–26 K), magnetizations again rise indicating spin-spiral transition of CoCr 1.8 Mg 0.2 O 4 . Furthermore, the effect of these transitions on M−H loop can be evident in terms of coercivity, saturation magnetization, and non-saturation behavior at high magnetic fields.

Source: Materials Letters

DOI: 10.1016/j.matlet.2024.137550