抄録
We have focused on the magnetic memories using parallel-aligned nanowires without mechanical moving parts, in order to achieve the ultra high transfer rate of more than 144 Gbps for Super Hi-Vision TV storage. In this memory using nanowires, the data is stored as the magnetic domains with up or down magnetization along magnetic nanowires, and domains are shifted by applying current along the nanowire direction for data writing and reading purpose. It is important for the magnetic nanowire memories, that all magnetic domains should be shifted precisely along nanowire by applied current.In this study, we have fabricated the [Co/Pd] multilayered nanowires with perpendicular anisotropy, and succeeded to drive multiple magnetic domains along the nanowire by application of one pulse current with 5 µs-width at current density range of 2.6–2.7×107 A/cm2. However, the magnetic state of domains was destroyed at higher current density by the induced high temperature due to Joule heating. In order to reduce Joule heating, we tried to apply one shorter pulse current with 500 ns-width, and we could confirmed the multiple magnetic domains shift at wider current density range of 2.6–2.9×107 A/cm2.
