journal article·2018-03-27

Direct Determination of Atomic Structure and Magnetic Coupling of Magnetite Twin Boundaries

Chunlin Chen, Hongping Li, Takehito Seki, Deqiang Yin, Gabriel Sanchez-Santolino, Kazutoshi Inoue, Naoya Shibata, Yuichi Ikuhara

ACS Nano· Volume 12· Issue 3
Publisher page

Abstract

Clarifying how the atomic structure of interfaces/boundaries in materials affects the magnetic coupling nature across them is of significant academic value and will facilitate the development of state-of-the-art magnetic devices. Here, by combining atomic-resolution transmission electron microscopy, atomistic spin-polarized first-principles calculations, and differential phase contrast imaging, we conduct a systematic investigation of the atomic and electronic structures of individual Fe3O4 twin boundaries (TBs) and determine their concomitant magnetic couplings. We demonstrate that the magnetic coupling across the Fe3O4 TBs can be either antiferromagnetic or ferromagnetic, which directly depends on the TB atomic core structures and resultant electronic structures within a few atomic layers. Revealing the one-to-one correspondence between local atomic structures and magnetic properties of individual grain boundaries will shed light on in-depth understanding of many interesting magnetic behaviors of widely used polycrystalline magnetic materials, which will surely promote the development of advanced magnetic materials and devices.
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Research context

OpenAlex topics: Magnetic properties of thin films · Magnetic Properties and Synthesis of Ferrites · Characterization and Applications of Magnetic Nanoparticles

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

Institute for Advanced Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

Institute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan

College of Aerospace Engineering, Chongqing University, Chongqing 400044, China

Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta, Nagoya 456-8587, Japan

Funding

Ministry of Education, Culture, Sports, Science and Technology · Japan Society for the Promotion of Science · National Natural Science Foundation of China · Chinese Academy of Sciences · Central Committee of the Communist Party of China

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