Nonhysteretic Vortex Magnetic Tunnel Junction Sensor with High Dynamic Reserve
Nonhysteretic Vortex Magnetic Tunnel Junction Sensor with High Dynamic Reserve
复制标题
DOI：
10.1103/physrevapplied.14.034051
复制
发表时间：
2020-09-18
影响因子：
4.6
通讯作者：
Xiao, Gang
中科院分区：
文献类型：
--
作者：
He, Guanyang;Zhang, Yiou;Xiao, Gang
从实验和模拟两方面研究了微米级磁性隧道结中出现不同磁涡旋态的多种几何条件。这两个结果吻合得很好，提供了清晰的旋涡行为图像。我们图案的单涡MTJ元件的紧凑阵列，并进行磁输运和噪声测量。该传感器具有无滞后特性、0.5 x 0.5 mm（2）的小尺寸、10（-13）Hz（-1）的低标准化噪声、1 Hz时18 nT/root Hz的可检测性以及100 Oe的大动态范围。其115 dB的宽动态储备以及对温度和环境杂散场的上级稳定性非常适合磁传感应用。
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 x 0.5 mm(2), a low normalized noise of 10(-13) Hz(-1), a detectability of 18 nT/root 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.