Abstract
Current-driven magnetic domain wall (DW) motion has been extensively studied not only theoretically, but also experimentally. The DW motion is induced by spin-transfer torque, that is, the transfer of spin angular momentum from conduction electrons to localized electrons. The velocity of DW motion is proportional to the spin polarization [P a = (σ ↑ − σ ↓ )/(σ ↑ + σ ↓ )] of electrical conductivity (σ) and its direction is the same as electron current when P σ > 0. The reverse DW motion is thus expected in ferromagnetic materials with negative spin polarization (P σ σ material and a negative P σ material, are of fundamental interest. We have paid a lot of attention to ferromagnetic Fe 4 N epitaxial films for application to spintronics devices because it is theoretically expected to have a large negative spin polarization (P σ = −1.0).2 Very recently, we confirmed its negative spin polarization by experiment.3,4
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
