(0171)Effect of MgO seed layer misorientation on the texture and magnetic property of FePt-C granular film

摘要

FePt-C based granular films with L10-ordered FePt nanoparticles have been considered as the most promising candidate for heat-assisted magnetic recording (HAMR) media for the recording density exceeding 1 Tbit/in2. For the practical application of L10-FePt films as HAMR media, the thin-film structure has to be optimized with excellent alignment of the c-axis normal to the film plane and small grain size of less than 6 nm with less than 10% size distribution. However, there are some remaining issues for the practical application, i.e. large switching field distribution and large in-plane hysteresis in the magnetization curve which could be an origin of poor SNR. In this work, we investigated the origin of the large in-plane component in the magnetization curve by comparing the FePt-C granular films deposited on MgO single-crystalline and poly-crystalline seed layer.