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Dependence of magnetoresistivity on charge-carrier density in metallic ferromagnets and doped magnetic semiconductors

Nature volume 395, pages 479–481 (1998)Cite this article

Abstract

Magnetoresistance—the field-dependent change in the electrical resistance of a ferromagnetic material—finds applications in technologies such as magnetic recording. Near and above the Curie point, T c, corresponding to the onset of magnetic order, scattering of charge carriers by magnetic fluctuations can substantially increase the electrical resistance1,2. These fluctuations can be suppressed3 by a magnetic field, leading to a negative magnetoresistance. Magnetic scattering might also have a role in the ‘colossal’ magnetoresistance observed in some perovskite manganese oxides4,5,6, but is it not yet clear how to reconcile this behaviour with that of the conventional ferromagnetic materials. Here we show that, in generic models of magnetic scattering, the bulk low-field magnetoresistance (near and above T c) is determined by a single parameter: the charge-carrier density. In agreement with experiment3,7,8, the low-field magnetoresistance scales with the square of the ratio of the field-induced magnetization to the saturation magnetization. The scaling factor is C ≈ x −2/3, where x is the number of charge carriers per magnetic unit cell. Data from very different ferromagnetic metals and doped semiconductors are in broad quantitative agreement with this relationship, with the notable exception of the perovskite manganese oxides (in which dynamic lattice distortions complicate and enhance4,9,10,11,12 the effects of pure magnetic scattering). Our results might facilitate searches for new materials with large bulk magnetoresistive properties.

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Figure 1: Low-field magnetoresistance C = (Δρ/ρ)/(m (H)/msat)2 as a function of the carrier density scaled to the magnetic lattice spacing.

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Acknowledgements

We thank G. Aeppli, B. Batlogg, H. Hwang, A. Millis and A. Ramirez for extensive discussions. Work done at Cambridge University was supported by the EPSRC.

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Authors and Affiliations

  1. Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey, 07974, USA

    Pinaki Majumdar & Peter B. Littlewood

  2. Cavendish Laboratory, Cambridge University, Madingley Road, CB3 0HE, Cambridge, UK

    Peter B. Littlewood

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  1. Pinaki Majumdar
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Correspondence to Peter B. Littlewood.

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Majumdar, P., Littlewood, P. Dependence of magnetoresistivity on charge-carrier density in metallic ferromagnets and doped magnetic semiconductors. Nature 395, 479–481 (1998). https://doi.org/10.1038/26703

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