Magneto-optical properties for antiferromagnetically coupled CoPt stacked films with hexagonal anti-dot lattices
Magneto-optical properties for antiferromagnetically coupled CoPt stacked films with hexagonal anti-dot lattices
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DOI：
10.7567/jjap.53.05fb04
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发表时间：
2014
影响因子：
1.5
通讯作者：
H. Yamane;Masanobu Kobayashi
中科院分区：
文献类型：
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作者：
H. Yamane;Masanobu Kobayashi
研究了含有ZnO光干涉层的垂直反铁磁耦合Co_（80）Pt_（20）叠层薄膜中二维阵列结构（六角反点晶格）对磁光特性的影响。在[CoPt/Ru/CoPt]三层结构中产生了反铁磁交换耦合，并且在两个CoPt层上形成了反点晶格。即使在纳米纤维化之后，CoPt层之间穿过非常薄的0.46 nm Ru夹层的交换耦合也得以保持。特征MO磁滞回线，测量由405 nm波长的入射光的样品含有50 nm的ZnO光学干涉层。具有200 nm直径孔的反点晶格表现出由于CoPt层的反平行磁化排列而导致的剩余克尔旋转角的增加。此外，与没有干涉层的样品相比，通过插入100 nm的ZnO干涉层，具有200 nm直径的孔的反点晶格的品质因数得到增强。这些改进归因于堆叠膜内部的MO干涉效应。
The influence of two-dimensional array structures (hexagonal anti-dot lattices) on magneto-optical (MO) properties was investigated in perpendicular antiferromagnetically coupled Co80Pt20 stacked films containing ZnO optical interference layers. Antiferromagnetic exchange coupling was generated in a [CoPt/Ru/CoPt] tri-layered structure, and anti-dot lattices were formed on both CoPt layers. The exchange coupling between the CoPt layers across a very thin 0.46-nm Ru interlayer was maintained even after nanofabrication. Characteristic MO hysteresis loops were measured by a 405-nm wavelength incident light on samples containing a 50-nm ZnO optical interference layer. The anti-dot lattice with a 200-nm diameter hole exhibited an increase in the residual Kerr rotation angle owing to the antiparallel magnetization alignment of the CoPt layers. Furthermore, compared with samples without the interference layer, the figure of merit for the anti-dot lattice with a 200-nm diameter hole was enhanced by inserting a 100-nm ZnO interference layer. These improvements are attributed to MO interference effects inside the stacked films.