Magneto-optical photonic crystals consisted of antiferromagnetically coupled films for next generation spatial light modulators

研究了由CoPt薄膜和贵金属衬底组成的叠层结构的磁光特性。在[CoPt/ZnO/Ag]叠层薄膜中获得了理想的方形面外磁滞回线，并具有较大的克尔旋转。此外，二维阵列结构对MO性质的影响进行了研究，在垂直反铁磁耦合的CoPt堆叠膜与ZnO光学干涉层。对于具有50 nm ZnO层的样品，具有200 nm直径孔的反点晶格由于CoPt层的反平行磁化排列而表现出剩余克尔旋转角的增加。另一方面，通过插入100 nm的ZnO干涉层，提高了反点晶格的MO优值。这种MO改善归因于MO光学延迟和堆叠膜内部的光学干涉的效果。

Magneto-optical (MO) properties of stacked structures consisting of CoPt thin films and noble metal underlayers were investigated. An ideal square out-of-plane hysteresis loop with a large Kerr rotation was obtained in the [CoPt/ZnO/Ag] stacked films. Moreover, the influence of two-dimensional array structures on MO properties was investigated in perpendicular antiferromagnetically coupled CoPt stacked-films with ZnO optical interference layers. For the sample with a 50-nm ZnO layer, the anti-dot lattice with 200-nm diameter hole exhibited an increase in the residual Kerr rotation angle due to antiparallel magnetization alignment of the CoPt layers. On the other hand, the MO figure of merit for the anti-dot lattice was enhanced by inserting a 100-nm ZnO interference layer. This MO improvement is attributed to the effects of MO optical retardation and optical interference inside the stacked-films.