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Influence of the elemental composition of the metal phase of the Co-MgF₂ and CoFeZr-MgF₂ composites on the magnetotransport properties

Russian version

Tregubova T.V.

¹, Stognei O.V.

¹, Tregubov I.M.

¹Voronezh State Technical University, Voronezh, Russia

Email: ttv1507@ya.ru

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Abstract
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The physical properties and structure of nanogranular thin-film composites Co_x(MgF_2)_100-x and (Co₄₇Fe₄₂Zr₁₁)_x(MgF_2)_100-x are studied in a wide range of concentrations of the metal phase (14≤ x, at.% ≤ 62 and 15≤ x, at.% ≤ 55). The systems were studied in the initial state and after heat treatment at various temperatures in a vacuum atmosphere up to 350^oC. The systems under study exhibit magnetoresistive properties. The maximum values of negative magnetoresistance (MR) reach 7% and 3.25%, respectively. Co_x(MgF_2)_100-x composites, in contrast to (CoFeZr)_x(MgF_2)_100-x composites, exhibit positive tunneling magnetoresistance. Keywords: nanogranular composites, magnetoresistance, anisotropy, thermal stability.

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