1/<i>f</i> resistance noise in the large magnetoresistance manganites

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.