Ferro-/Ferri-Exchange Coupled Magnetic Double Layers For High Density Magneto-optical Data Storage

PtCo/TbFeCo ferro-/ferri-exchange coupled double layer film (ECDL) was fabricated for high density magneto-optical (MO) data storage. At room temperature (RT), the PtCo film is in-plane magnetized and acts as a mask layer. However, at elevated temperature, it turns to be out-of-plane magnetized because of the strong exchange coupling interactions with the TbFeCo layer. Therefore, this ECDL film has a magnetically induced superresolution (MSR) effect. Combining it with the good Kerr signal at short wavelength, the PtCo/TbFeCo film can be a good candidate for blue laser-MSR MO data storage.