Low Temperature Physics: 44, 1180 (2018); https://doi.org/10.1063/1.5060973
Fizika Nizkikh Temperatur: Volume 44, Number 11 (November 2018), p. 1510-1520    ( to contents , go back )

Anisotropic tunnel magnetoresistance of pressed nanopowders of chromium dioxide

N.V. Dalakova, E.Yu. Belyaev, O.M. Bludov, V.A. Gorelyi

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
E-mail: dalakova@ilt.kharkov.ua

O.M. Osmolovskaya, and M.G. Osmolovskiy

St. Petersburg University,Department of Chemistry, St. Petersburg, 198504, Russia

Received May 23, 2018, published online September 26, 2018

Abstract

Resistive, magnetoresistive and magnetic properties of chromium dioxide nanopowders CrO2 are investigated. The powders consisted of either spherical or needle-shaped nanoparticles. The nanoparticles were covered with dielectric shells of different composition and thickness. Anisotropy of the tunnel magnetoresistance was observed for all the powders. It is shown that the anisotropy of the tunnel magnetoresistance of CrO2 powders is explained by the formation of an induced magnetic texture and is determined by the difference in the magnetization rate of the sample along and perpendicular to the plane of compaction of the powders.

Key words: half metals, chromium dioxide, granular magnetic materials, tunnel magnetoresistance, magnetic anisotropy.

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