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Dependence of noise in magnetic tunnel junction sensors on annealing field and temperature

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6 Author(s)
Liou, S.H. ; Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA ; Zhang, Rui ; Russek, Stephen E. ; Yuan, L.
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The minimum detectable field of magnetoresistive sensors is limited by their intrinsic noise. Magnetization fluctuations are one of the crucial noise sources and are related to the magnetization alignment at the antiferromagnetic-ferromagnetic interface. In this study, we investigated the low frequency noise of magnetic tunnel junctions (MTJs) annealed in the temperature range from 265 to 305 °C and magnetic fields up to 7 T, either in helium or hydrogen environments. Our results indicate that the magnetic fluctuators in these MTJs changed their frequency based on annealing field and temperature. The noise of the MTJs at low frequency can be reduced by annealing in high magnetic field (7 T) and further improved by annealing in a hydrogen environment.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 7 )