KENBIKYO Vol.51▶No.1 2016

Magnetism in Natural Interfaces—Direct Observations by Electron Holography—

Yasukazu Murakamia,b, Koudai Niitsuc, Toshiaki Tanigakid, Hyun Soon Parke, Ryosuke Kainumaf, Daisuke Shindog,c

a Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University
bThe Ultramicroscopy Research Center, Kyushu University
cCenter for Emergent Matter Science, RIKEN
dResearch & Development Group, Hitachi Ltd.
eDepartment of Materials Science and Engineering, Dong-A University
fDepartment of Materials Science, Tohoku University
gInstitute of Multidisciplinary Research for Advanced Materials, Tohoku University

Abstract: An interface is a structural imperfection that significantly affects magnetic and electric properties in crystalline solids. Studies of the interface magnetism are vitally important for technologies related with permanent magnets, magnetic recording, magnetoelectronics, etc. However, it remains yet challenging to reveal the magnetism in natural interfaces, such as antiphase boundaries (APBs) in ordered alloys, because of the complex shape and the extremely small thickness. This paper reports on the electron holography study that determined magnetic flux density from narrow APBs produced in an ordered alloy, Fe70Al30.

Key words: electron holography, antiphase boundary, magnetic flux density, degree of atomic ordering, magnetic domain structure