Yoke-shaped MgO-barrier magnetic tunnel junction sensors
Yoke-shaped MgO-barrier magnetic tunnel junction sensors
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DOI：
10.1063/1.4773180
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发表时间：
2012-12
影响因子：
4
通讯作者：
Junyang Chen;N. Carroll;Jiafeng Feng;J. Coey
中科院分区：
文献类型：
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作者：
Junyang Chen;N. Carroll;Jiafeng Feng;J. Coey
已经设计，制造和研究了基于MGO驻磁性隧道连接的轭型传感器。它们显示出良好的线性隧穿磁磁力（TMR）响应。通过两步退火与形状各向异性一起将两个铁磁电极的几乎垂直构型设置。低频噪声表征表明，这些轭型TMR传感器的磁性1/F噪声相对较低。场敏感性高达27％/mt，而场检测到10 Hz时为4.6 nt/hz，在1 kHz时达到460 pt/hz。这些TMR传感器可能对诸如生物磁检测等应用很有用。
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.