Novel Epitaxial Films of Magnetoelectric Hexaferrite Materials

Abstract

The magnetoelectric effect in M-type Ti-Co doped strontium hexaferrite has been studied using a combination of magnetometry and element specific soft X-ray spectroscopies. A large increase (> x30) in the magnetoelectric coefficient is found for samples in which Co2+ enters the trigonal bi-pyramidal site. The 5-fold trigonal bipyramdial site has been shown to provide an unusual mechanism for electric polarization based on the displacement of magnetic transition metal (TM) ions. We show that for Co entering this site an off-center displacement of the cation can induce a large local electric dipole as well as providing increased magnetostriction enhancing the magnetoelectric effect.

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Document Details

Document Type
Technical Report
Publication Date
Nov 20, 2018
Accession Number
AD1071824

Entities

People

  • Carmine Vittoria

Organizations

  • Northeastern University

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Density Functional Theory
  • Electric Fields
  • Elements
  • Ferrites
  • Films
  • Geometry
  • Laboratory Magnetometers
  • Magnetic Fields
  • Magnetic Materials
  • Magnetic Properties
  • Magnetoelectric Effect
  • Materials
  • Materials Science
  • Measurement
  • Spectra
  • Transition Metals
  • X Rays

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Materials Science and Engineering.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene