Conduction noise in La[sub 0.67]Ca[sub 0.33]MnO[sub 3] film

Khare, Neeraj; Moharil, U. P.; Gupta, A. K.
September 2001
Journal of Applied Physics;9/15/2001, Vol. 90 Issue 6
Academic Journal
The temperature and frequency dependence of conduction noise in La[sub 0.67]Ca[sub 0.33]MnO[sub 3] film are reported. The film was prepared by a screen printing technique and had a metal–insulator transition temperature (T[sub p]) and ferromagnetic transition temperature (T[sub C]) at 140 and 230 K, respectively. The magnetoresistance ratio (MRR) of the film at 1 kOe was found to be mainly due to grain boundaries. The observed voltage noise spectral density (S[sub v]) shows 1/f[sup α] type behavior for all the temperatures ranging from 77 to 300 K. S[sub v] shows an increase as the temperature is decreased below T[sub C] and reaches a peak value at T[sub p]. The increase in S[sub v] below T[sub C] is attributed to extra noise arising due to fluctuations in spin alignment in the ferromagnetic state. Application of a 1 kOe magnetic field reduces noise and the reduction in the noise is observed up to T[sub C]. A comparison of the temperature dependence of MRR and noise reduction ratio due to the magnetic field indicates that the magnetoresistance in the polycrystalline film of La[sub 0.67]Ca[sub 0.33]MnO[sub 3] is strongly influenced by the grain boundaries but the noise due to fluctuations in spin alignment is intrinsic and comes mainly from the grains. © 2001 American Institute of Physics.


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