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Domain Wall Magnetoresistance and Complex magnetic Response in Antiferromagnetically Coupled Fe/Cr Multilayers

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Abstract

For antiferromagnetically coupled Fe/Cr(100) multilayers the low field contribution to the resistivity, which is caused by the domain walls (DWs), is strongly enhanced at low temperatures. The low temperature resistivity increases approximately according to a power law with the exponent 0.7–1. This behaviour can be explained by the suppression of anti-localization effects by the nonuniform gauge fields caused by the domain walls. Analyses of complex low frequency magnetic susceptibility shows an enhancement of the magnetic losses at low magnetic fields, which may be related to the AC field induced DWs movement. At low temperatures (T<100K) DWs become pinned. For frequencies (102<f< 103) Hz at temperatures below 10K, this hysteretic low field peak in the magnetic losses transforms to a non-hysteretic dip for |H|< 20 Oe, indicating a possible qualitative change in the dynamics of the DWs. The frequency dependence of the dissipation at 2K, may be reasonably well fitted by the expression that describes the losses of a damped oscillator with a single relaxation time of about 10-4 sec.

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Authors and Affiliations

  1. Dpto. de Física de la Materia Condensada, C-III, Universidad Autónoma de Madrid, 28049, Madrid, Spain

    F. G. Aliev & R. Villar

  2. CMIT, University of Alabama, Tuscaloosa, USA

    R. Schad

  3. Instituto de Ciencia de Materiales Madrid, CSIC, 28049, Cantoblanco, Madrid, Spain

    J. L. Martinez

Authors
  1. F. G. Aliev
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  2. R. Villar
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  3. R. Schad
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  4. J. L. Martinez
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Aliev, F.G., Villar, R., Schad, R. et al. Domain Wall Magnetoresistance and Complex magnetic Response in Antiferromagnetically Coupled Fe/Cr Multilayers. MRS Online Proceedings Library 746, 22 (2002). https://doi.org/10.1557/PROC-746-Q2.2

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  • DOI: https://doi.org/10.1557/PROC-746-Q2.2

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