Yoke-shaped MgO-barrier magnetic tunnel junction sensors

J. Y. Chen; N. Carroll; J. F. Feng; J. M D Coey

doi:10.1063/1.4773180

Yoke-shaped MgO-barrier magnetic tunnel junction sensors

J. Y. Chen, N. Carroll, J. F. Feng, J. M D Coey

Electrical and Computer Engineering

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Abstract

Yoke-shaped sensors based on MgO-barrier magnetic tunnel junctions have been designed, fabricated, and studied; they show a good linear tunneling magnetoresistance (TMR) response. A nearly-perpendicular configuration of two ferromagnetic electrodes was set by two-step annealing together with shape anisotropy. The low-frequency noise characterization shows these yoke-shaped TMR sensors have relatively low magnetic 1/f noise. The field sensitivity is up to 27%/mT, while the field detectivity reaches 4.6 nT / Hz at 10 Hz and 460 pT / Hz at 1 kHz. These TMR sensors may be useful for applications such as biomagnetic detection.

Original language	English (US)
Article number	262402
Journal	Applied Physics Letters
Volume	101
Issue number	26
DOIs	https://doi.org/10.1063/1.4773180
State	Published - Dec 24 2012

Bibliographical note

Funding Information:
The authors thank Bo Cui from University of Waterloo, Canada, K. Oguz, H. Kurt, and D. Ménard for helpful discussions. The work was supported by the EU as part of FP7 NAMDIATREAM Project and by Science Foundation Ireland as part of the Nanoscale Interface and Spin Electronics (NISE) Project (10/IN1/I3006).

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abstract = "Yoke-shaped sensors based on MgO-barrier magnetic tunnel junctions have been designed, fabricated, and studied; they show a good linear tunneling magnetoresistance (TMR) response. A nearly-perpendicular configuration of two ferromagnetic electrodes was set by two-step annealing together with shape anisotropy. The low-frequency noise characterization shows these yoke-shaped TMR sensors have relatively low magnetic 1/f noise. The field sensitivity is up to 27%/mT, while the field detectivity reaches 4.6 nT / Hz at 10 Hz and 460 pT / Hz at 1 kHz. These TMR sensors may be useful for applications such as biomagnetic detection.",

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Yoke-shaped MgO-barrier magnetic tunnel junction sensors

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