Direct Observation of Domain Wall Motion Induced by Low-Current Density in TbFeCo Wires

概要

論文の詳細を見る
The motion of magnetic domain walls (DWs) in TbFeCo wires induced by low-current density up to $4.97\times 10^{10}$ A/m2 has been directly observed by Kerr polarized optical microscopy. The critical current density slightly increases with wire width, from $4.97\times 10^{10}$ A/m2 for 800-nm-width wires to $6.16\times 10^{10}$ A/m2 for 1500-nm-width wires. DW velocity is estimated to be $28\pm 2$ m/s, and mostly independent on the wire width. Increasing current density results in an increase of the wall velocity up to $59\pm 4$ m/s. These findings indicate that TbFeCo nanowire is an excellent candidate for low-energy, fast accessing DW-controlled devices.
2011-09-25