Three-dimensional spin orientation in antiferromagnetic domain walls of NiO studied by x-ray magnetic linear dichroism photoemission electron microscopy

Kuniaki Arai, Taichi Okuda, Arata Tanaka, Masato Kotsugi, Keiki Fukumoto, Takuo Ohkochi, Tetsuya Nakamura, Tomohiro Matsushita, Takayuki Muro, Masaki Oura, Yasunori Senba, Haruhiko Ohashi, Akito Kakizaki, Chiharu Mitsumata, Toyohiko Kinoshita

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

A determination of the three-dimensional spin directions in all types of domain walls (DWs) of antiferromagnetic NiO has been successfully performed by photoemission electron microscopy combined with x-ray magnetic linear dichroism (XMLD), both for s- and p-polarized light. By comparing the azimuthal angle dependence of the XMLD contrast in the DWs with cluster model calculations which include the crystal symmetry and full-multiplet splitting, we determine the spin structures in the {001} T walls, {011} T walls, 120° S walls, and 180° S walls. In some cases, distinct S walls are not formed between two adjacent S domains, and the spin direction changes gradually over a wide range of the S domain structures. In the S walls, the spin direction is parallel to the magnetic easy {111} plane. These spin configurations arise from the large difference in anisotropy energy between the in-plane and out-of-plane directions. Unexpectedly large widths in the several hundred nanometer range were observed for all the DWs. This also shows that NiO has a small magnetocrystalline anisotropy energy. Together with Monte Carlo simulation results, the qualitative phenomena concerning the wall energies are discussed. We further investigated the difference in wall energy between the {001} T wall and the {011} T wall. From the Monte Carlo simulation and an experimental study of heating effects, it is revealed that the {001} T wall energy is smaller than the {011} T wall energy.

Original languageEnglish
Article number104418
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number10
DOIs
Publication statusPublished - 2012 Mar 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Three-dimensional spin orientation in antiferromagnetic domain walls of NiO studied by x-ray magnetic linear dichroism photoemission electron microscopy'. Together they form a unique fingerprint.

  • Cite this

    Arai, K., Okuda, T., Tanaka, A., Kotsugi, M., Fukumoto, K., Ohkochi, T., Nakamura, T., Matsushita, T., Muro, T., Oura, M., Senba, Y., Ohashi, H., Kakizaki, A., Mitsumata, C., & Kinoshita, T. (2012). Three-dimensional spin orientation in antiferromagnetic domain walls of NiO studied by x-ray magnetic linear dichroism photoemission electron microscopy. Physical Review B - Condensed Matter and Materials Physics, 85(10), [104418]. https://doi.org/10.1103/PhysRevB.85.104418