Magneto-Optical Enhancement and Chemical Sensing Applications of Perpendicular Magnetic CoPt/Ag Stacked Structures with a ZnO Intermediate Layer
Magneto-Optical Enhancement and Chemical Sensing Applications of Perpendicular Magnetic CoPt/Ag Stacked Structures with a ZnO Intermediate Layer
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DOI：
10.2320/matertrans.m2015395
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发表时间：
2016-06
影响因子：
1.2
通讯作者：
H. Yamane;K. Takeda;Kobayashi Masanobu
中科院分区：
文献类型：
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作者：
H. Yamane;K. Takeda;Kobayashi Masanobu
通过极克尔测量研究了具有不同厚度 ZnO 中间层的垂直磁性 Co80Pt20/Ag 堆叠 lms 的磁光 (MO) 特性。在CoPt/Ag界面插入薄ZnO层改善了Ag等离子体边缘的垂直磁性和MO增强。具有 2 nm 厚 ZnO 层的 CoPt/Ag 堆叠 lms 表现出理想的方形面外磁滞回线，在紫外区域具有约 1.4° 的相对较大克尔角。随着ZnO层厚度的增加，MO等离子体增强的峰值位置向更长的波长移动，并且出现了与ZnO的带隙能量一致的新峰值。此外，当ZnO层的厚度为入射光的亚波长时，CoPt/ZnO/Ag堆叠层充当法布里-珀罗标准具。结果，在堆叠lms内实现了MO腔，并在可见光区域获得了具有约20°大克尔旋转角的理想方形MO环。 MO 增强因子达到约 200。我们证明了堆叠式流明对流明表面光学条件的变化很敏感。所开发的MO腔可以在简单的测量条件下充当高精度的化学和生物传感系统。 [doi:10.2320/matertrans.M2015395]
The magneto-optical (MO) properties of perpendicular magnetic Co80Pt20/Ag stacked lms with ZnO intermediate layers of different thickness were investigated by polar Kerr measurements. The insertion of a thin ZnO layer at the CoPt/Ag interface improved the perpendicular magnetic properties and MO enhancement at the plasma edge of Ag. The CoPt/Ag stacked lms with a 2-nm-thick ZnO layer exhibited an ideal square out-of-plane hysteresis loop with a relatively large Kerr angle of approximately 1.4° in the ultraviolet region. The peak position of the MO plasma enhancement shifted to longer wavelength as the thickness of the ZnO layer increased, and a new peak appeared consistent with the band-gap energy of ZnO. Moreover, the CoPt/ZnO/Ag stacked layer acted as a Fabry–Pérot etalon when the thickness of the ZnO layer was the sub-wavelength of incident light. As a result, a MO cavity was realized in the stacked lms, and an ideal square MO loop with a large Kerr rotation angle of approximately 20° was obtained in the visible region. The MO enhancement factor reached approximately 200. We demonstrated that the stacked lms were sensitive to changes in the optical conditions at the lm surface. The developed MO cavity can act as a highly accurate chemical and biological sensing system under simple measurement conditions. [doi:10.2320/matertrans.M2015395]