1/f resistance noise in the large magnetoresistance manganites

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Abstract
Resistance noise has been measured in thin films of La0.6Y0.07Ca0.33MnO3 at the ferromagnetic metal to paramagnetic‐insulator transition where a large magnetoresistance is observed. Fluctuations in resistance were found to have a 1/f power law form throughout the transition where f is frequency. This intrinsic 1/f noise is much larger than what is typical for metallic films and is consistent with the fluctuation‐dissipation theorem and magnetization fluctuations in the ferromagnetic phase. The implications of this large low frequency noise for practical magnetoresistive devices will be addressed.

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