Multiple geometrical conditions for different magnetic vortex states to appear in micrometer-sized magnetic tunnel junctions (MTJs) are investigated in experiment and simulation. Both results match up well, providing clear images of vortex behaviors. We pattern a compact array of single-vortex MTJ elements and perform magnetotransport and noise measurements. This sensor features nonhysteretic behavior, a small size of 0.5 × 0.5 ${\mathrm{mm}}^2$, a low normalized noise of ${10}^{-13}{\mathrm{Hz}}^{-1}$, a detectability of $18nT/\sqrt{Hz}$ at 1 Hz, and a large dynamic range of 100 Oe. Its 115 dB broad dynamic reserve and superior stability against temperature and environmental stray fields are ideally suited for magnetic sensing applications.

中文翻译：

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具有高动态储备的非迟滞涡旋磁隧道结传感器

在实验和仿真中研究了在微米大小的磁隧道结（MTJ）中出现不同磁涡旋状态的多种几何条件。两种结果吻合得很好，提供了清晰的涡旋行为图像。我们对单涡旋MTJ元件的紧凑阵列进行图案化，并进行磁运输和噪声测量。该传感器具有非迟滞特性，小尺寸为0.5×0.5${\mathrm{毫米}}^2$，标准化噪声低 ${10}^{-13}{\mathrm{赫兹}}^{-\mathrm{1个}}$，可检测性为 $\mathrm{18岁}ñŤ/\sqrt{Hž}$频率为1 Hz，动态范围为100 Oe。其115 dB的宽动态储备以及针对温度和环境杂散场的出色稳定性非常适合于磁传感应用。