Noise suppression and sensitivity manipulation of magnetic tunnel junction sensors with soft magnetic Co70.5Fe4.5Si15B10 layer

L. Huang, Z. H. Yuan, B. S. Tao, C. H. Wan, P. Guo, Q. T. Zhang, L. Yin, J. F. Feng, T. Nakano, H. Naganuma, H. F. Liu, Y. Yan, X. F. Han

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The voltage noise characteristic and sensitivity of magnetic tunnel junction sensors are crucial for ultralow field detection. In this work, we used a soft magnetic material electrode Co70.5Fe4.5Si15B10 as a sensing layer to improve the sensitivity. Then, a bias field along the easy axis of a free layer was applied to improve the linearity and manipulate the sensitivity of magnetic tunnel junction sensors. More importantly, random telegraph noise was suppressed by the bias field, resulting in hysteresis-free performance. The highest sensitivity of 3.9%/Oe and the best field detectivity of 4.5 nT/√ Hz at 10 Hz without hysteresis have been achieved. The sensors showed excellent performance with CoFeSiB electrodes, indicating that it is an effective way to improve the performance of sensors by introducing the bias field.

Original languageEnglish
Article number113903
JournalJournal of Applied Physics
Volume122
Issue number11
DOIs
Publication statusPublished - 2017 Sep 21

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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