Control of domain wall position in L-shaped Fe4N negatively spin polarized ferromagnetic nanowire

T. Gushi, K. Ito, S. Honda, Y. Yasutomi, S. Higashikozono, K. Toko, H. Oosato, Y. Sugimoto, K. Asakawa, N. Ota, T. Suemasu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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 [Pa = (σ - σ)/(σ + σ)] of electrical conductivity (σ) and its direction is the same as electron current when Pσ > 0. The reverse DW motion is thus expected in ferromagnetic materials with negative spin polarization (Pσ < 0) compared to those with positive spin polarization, because minority spin dominates the electrical conduction. Thereby, spintronics devices composed of both a positive Pσ material and a negative Pσ material, are of fundamental interest. We have paid a lot of attention to ferromagnetic Fe4N epitaxial films for application to spintronics devices because it is theoretically expected to have a large negative spin polarization (Pσ = -1.0).2 Very recently, we confirmed its negative spin polarization by experiment.3,4

Original languageEnglish
Title of host publication2015 IEEE International Magnetics Conference, INTERMAG 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479973224
Publication statusPublished - 2015 Jul 14
Externally publishedYes
Event2015 IEEE International Magnetics Conference, INTERMAG 2015 - Beijing, China
Duration: 2015 May 112015 May 15

Publication series

Name2015 IEEE International Magnetics Conference, INTERMAG 2015


Other2015 IEEE International Magnetics Conference, INTERMAG 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Surfaces, Coatings and Films

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