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性能。在[CoPt/ZnO/Ag]叠合薄膜中获得了具有较大克尔旋转的理想方形面外磁滞回线。此外，在具有ZnO光干涉层的垂直反铁磁耦合CoPt叠层薄膜中，研究了二维阵列结构对MO性能的影响。对于具有50 nm ZnO层的样品，由于CoPt层的反平行磁化排列，具有200 nm孔径的反点晶格的残余Kerr旋转角增加。另一方面，通过插入100 nm的ZnO干涉层，提高了反点阵的MO优值。这种MO的改善是由于MO的光延迟和叠合膜内部的光干涉的影响。

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.