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Angular Dependence of Low-Frequency Noise in Al _{2} O _{3} -Based Magnetic Tunnel Junction Sensors With Conetic Alloy

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6 Author(s)
Lei, Z.Q. ; Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong, China ; Zeng, T. ; Feng, G. ; Chen, P.J.
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We demonstrated the noise performances of Al2O3-based magnetic tunnel junction sensors (MTJs) in the low-frequency regimes. Conetic alloy Ni77Fe14Cu5Mo4 was deposited as both the MTJ pinned layer and free layer because of its superb magnetically soft properties. A rotating magnetic field was employed to investigate the angular dependence of the MTJ low-frequency noise. Hooge parameter was applied for parameterizing the low-frequency noise. The measurement results demonstrate that the Hooge parameters are angular-dependent and they exhibit a linear relation with respect to the angular magnetoresistive susceptibility. It can be also observed that the Hooge parameters possess a higher value when the Conetic MTJs are in the region of antiparallel state. These results indicate that the magnetic fluctuations in the ferromagnetic layers contribute to the low-frequency noise level in Conetic MTJ sensors.

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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )