Micropatterned Co-based amorphous ribbon meanders were prepared by MEMS technology on the flexible PET substrate. Different holders with varying arch heights were fabricated through 3D printing technology and used for carrying out tensile stresses. The giant magnetoimpedance (GMI) ratio was investigated under different tensile stress inductions (0~88 MPa). The results indicate that the GMI ratio of the flexible ribbon meanders is significantly impacted due to presence of tensile stress. As tensile stress increases, the GMI ratio first increases and then decreases. The maximum GMI ratio of 28.38% is achieved at a tensile stress level of 11 MPa. Additionally, the peak field gradually approaches zero as stress increases. When tensile stress increases from 0 MPa to 88 MPa, the peak field is shifted by 10.59 Oe.
In recent years, metal halide perovskite materials have received extensive attention due to their strong X-ray absorption capacity, high sensitivity, and low-cost preparation1 . In this work, cesium silver bismuth bromide (Cs2AgBiBr6) perovskite based detectors were simulated by using drift-diffusion equation in Silvaco. The X-ray energy spectrum was calculated according to the open-source TASMICS algorithm provided by J.H. Siewerdsen2 . The perovskite mass energy attenuation coefficients acquired from the NIST database3 were converted into imaginary parts of material refractive index. According to the simulation results, the average photo-current density of Cs2AgBiBr6 perovskite material is 10-9A/cm2 compared to Si (10-10A/cm2 ) and α-Se (1011/cm2 ). This is due to the relatively large atomic number of Cs2AgBiBr6 material and a high carrier mobility lifetime product. In addition, the Cs2AgBiBr6 photodetector exhibits a high photocurrent-to-dark current ratio (PDR) of 9700 than Si (51), while α-Se has the largest PDR value of 1.4301Ă—105 . In summary, Both Cs2AgBiBr6 and α-Se can be used as the ideal direct X-ray detector materials.
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