Novel Epitaxial Films of Magnetoelectric Hexaferrite Materials
Technical Report,15 Sep 2014,14 Mar 2017
NORTHEASTERN UNIV BOSTON MA BOSTON United States
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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.