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1997•Physical review. B, Condensed matterRequires access

Magnetoresistance of granular ferromagnets

A. Gerber, A. Milner, Bella Groisman, Mark G. Karpovsky, A. Gladkikh, A. Sulpice

Open publisher page 96 citations

Abstract

We report a comparative study of the magnetic and magnetoresistance phenomena in two types of granular ferromagnets: ferromagnet-normal-metal mixtures Ni-Ag, Co-Ag, and ferromagnet-insulator mixtures Ni-${\mathrm{SiO}}_{2}$ , Co-${\mathrm{SiO}}_{2}$ . Anisotropic magnetoresistance and giant magnetoresistance (GMR) are identified in both types of systems above and below the magnetic component percolation threshold respectively. The GMR effect in granular ferromagnets is shown to be essentially independent of the nature and resistance of the nonmagnetic intergranular matrix.

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What this paper is about

We report a comparative study of the magnetic and magnetoresistance phenomena in two types of granular ferromagnets: ferromagnet-normal-metal mixtures Ni-Ag, Co-Ag, and ferromagnet-insulator mixtures Ni-${\mathrm{SiO}}_{2}$ , Co-${\mathrm{SiO}}_{2}$ . Anisotropic magnetoresistance and giant magnetoresistance (GMR) are identified in both types of systems above and below the magnetic component percolation threshold respectively. The GMR effect in granular ferromagnets is shown to be essentially independent of the nature and resistance of the nonmagnetic intergranular matrix.

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Available abstract

We report a comparative study of the magnetic and magnetoresistance phenomena in two types of granular ferromagnets: ferromagnet-normal-metal mixtures Ni-Ag, Co-Ag, and ferromagnet-insulator mixtures Ni-${\mathrm{SiO}}_{2}$ , Co-${\mathrm{SiO}}_{2}$ . Anisotropic magnetoresistance and giant magnetoresistance (GMR) are identified in both types of systems above and below the magnetic component percolation threshold respectively. The GMR effect in granular ferromagnets is shown to be essentially independent of the nature and resistance of the nonmagnetic intergranular matrix.

Key concepts: Magnetoresistance, Condensed matter physics, Ferromagnetism, Giant magnetoresistance, Materials science, Colossal magnetoresistance, Percolation threshold, Intergranular corrosion

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