Atomic Structure and Electron Magnetic Circular Dichroism of Individual Rock Salt Structure Antiphase Boundaries in Spinel Ferrites

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jinlian Lu
  • Lei Jin
  • Ján Rusz
  • Vancho Kocevski
  • Hideto Yanagihara
  • Eiji Kita
  • Joachim Mayer
  • Rafal E. Dunin-Borkowski
  • Hongjun Xiang

Detail(s)

Original languageEnglish
Article number2008306
Journal / PublicationAdvanced Functional Materials
Volume31
Issue number21
Online published17 Mar 2021
Publication statusPublished - 21 May 2021

Abstract

Spinel ferrites are an important class of materials, whose magnetic properties are of interest for industrial applications. The antiphase boundaries (APBs) that are commonly observed in spinel ferrite films can hinder their applications in spintronic devices and sensors, as a result of their influence on magnetic degradation and magnetoresistance of the materials. However, it is challenging to correlate magnetic properties with atomic structure in individual APBs due to the limited spatial resolution of most magnetic imaging techniques. Here, aberration-corrected scanning transmission electron microscopy and electron energy-loss magnetic chiral dichroism are used to measure the atomic structure and electron magnetic circular dichroism (EMCD) of a single APB in NiFe2O4 that takes the form of a rock salt structure interlayer and is associated with a crystal translation of (1/4)a[011]. First principles density functional theory calculations are used to confirm that this specific APB introduces antiferromagnetic coupling and a significant decrease in the magnitude of the magnetic moments, which is consistent with an observed decrease in EMCD signal at the APB. The results provide new insight into the physical origins of magnetic coupling at an individual defect on the atomic scale.

Research Area(s)

  • antiphase boundary, atomic defect structure, electron magnetic circular dichroism, first principles calculations, spinel ferrites, transmission electron microscopy

Citation Format(s)

Atomic Structure and Electron Magnetic Circular Dichroism of Individual Rock Salt Structure Antiphase Boundaries in Spinel Ferrites. / Li, Zhuo; Lu, Jinlian; Jin, Lei; Rusz, Ján; Kocevski, Vancho; Yanagihara, Hideto; Kita, Eiji; Mayer, Joachim; Dunin-Borkowski, Rafal E.; Xiang, Hongjun; Zhong, Xiaoyan.

In: Advanced Functional Materials, Vol. 31, No. 21, 2008306, 21.05.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review