A. A. Utoplov, N. V. Prutsakova, E. V. Chebanova, A. V. Nazarenko, A. G. Rudskaya, A. O. Letovaltsev, Yu. V. Kabirov, “Magnetoresistance of composites based on manganite La$_{0.7}$Sr$_{0.3}$MnO$_3$ and oxides NiO, TiO$_2$”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 2025, Volume 51, Issue 21,Pages 54

Magnetoresistance of composites based on manganite La$_{0.7}$Sr$_{0.3}$MnO$_3$ and oxides NiO, TiO$_2$

A. A. Utoplov^a, N. V. Prutsakova^b, E. V. Chebanova^b, A. V. Nazarenko^c, A. G. Rudskaya^a, A. O. Letovaltsev^a, Yu. V. Kabirov^a

^a Southern Federal University, Rostov-on-Don
^b Don State Technical University, Rostov-on-Don
^c Southern Research Center of the Russian Academy of Sciences, Rostov-on-Don

Abstract: Magnetoresistive properties of ceramic composites based on ferromagnet La$_{0.7}$Sr$_{0.3}$MnO$_3$ and oxides of nickel and titanium with different ratios of components were studied. Two methods were used to prepare the composites: calcination of La$_{0.7}$Sr$_{0.3}$MnO$_3$ compositions mixed with dispersed titanium and nickel powders, and La$_{0.7}$Sr$_{0.3}$MnO$_3$ mixed with oxides of these metals at a temperature of 1150$^\circ$C. For the compositions 98% La$_{0.7}$Sr$_{0.3}$MnO$_3$/2%TiO$_2$ and 88% La$_{0.7}$Sr$_{0.3}$MnO$_3$/12%NiO (%mass) the negative magnetoresistivity reaches 7.5% in a constant magnetic field of 15 kOe at room temperature.

Keywords: ferromagnet, oxides, manganite, composite, spin-dependent tunneling, negative magnetoresistance.

Received: 15.05.2025
Revised: 21.07.2025
Accepted: 09.08.2025

DOI: 10.61011/PJTF.2025.21.61530.20374