Giant AC magnetoresistance and anisotropic AC magnetoresistance in granular magnetic alloys

Details Giant AC magnetoresistance and anisotropic AC magnetoresistance in granular magnetic alloys Giant AC magnetoresistance and anisotropic AC magnetoresistance in granular magnetic alloys

1999-12-14

arxiv.org/abs/cond-mat/9912259v2

Physics

Condensed Matter

Materials Science

This paper has been withdrawn by the authors, as some results were not confirmed in later experiments

Scientific paper

(withdrawn)AC resistance of melt-spun granular magnetic Cu85Co15 ribbons was measured as a function of temperature in the range 5-300 K, magnetic field Hdc in the range -60 kOe to 60 kOe, and frequency in the range 1-1000 Hz. A sharp peak of zero-field resistance, which scales with frequency, and an associated isotropic giant AC magnetoresistance in small fields are observed around the temperature of collective freezing of interacting magnetic moments. Anomalous behavior of AC resistance in large fields (Hdc > 20 kOe) is observed in a much broader temperature range. This effect is not only frequency- dependent, but also highly sensitive to anisotropy. We call it anisotropic AC magnetoresistance.

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