Nonlinear magnetoelectric effects in Al-substituted strontium hexaferrite.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
22 Apr 2021
22 Apr 2021
Historique:
received:
27
02
2021
accepted:
08
04
2021
entrez:
23
4
2021
pubmed:
24
4
2021
medline:
24
4
2021
Statut:
epublish
Résumé
This report is on the observation and theory of electric field E induced non-linear magnetoelectric (NLME) effects in single crystal platelets of ferrimagnetic M-type strontium aluminum hexagonal ferrite. Using microwave measurement techniques, it was found that a DC electric field along the hexagonal c-axis results in significant changes in the saturation magnetization and uniaxial magneto-crystalline anisotropy field and these changes are proportional to the square of the applied static electric field. The NLME effects were present with or without an external bias magnetic field. The E-induced variation in magnetic order parameters is attributed to weakening of magnetic exchange and spin-orbit interactions since conduction electrons in the ferrite are effectively excluded from both interactions while being in transit from one Fe ion to another. We present a phenomenological theory which considers magneto-bielectric effects characterized by a quadratic term in electric field E in the free energy density. The coefficients for the NLME coupling terms have been calculated from experimental data and they do show variations with the Al substitution level and the largest rates of change of the saturation magnetization and anisotropy constant change with the applied power were observed for x = 0.4. It was also clear from the study that strength of the NLME effect does not depend on the amount Al substitution, but critically depends on the electrical conductivity of the sample with the highest NLME coefficients estimated for the sample with the highest conductivity. Results of this work are of importance for a new family of electric field tunable, miniature, high frequency ferrite devices.
Identifiants
pubmed: 33888824
doi: 10.1038/s41598-021-88203-w
pii: 10.1038/s41598-021-88203-w
pmc: PMC8062681
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
8733Subventions
Organisme : National Science Foundation
ID : 1923732
Organisme : National Science Foundation
ID : 1808892
Organisme : Air Force Office of Scientific Research
ID : FA9550-20RXCOR074
Organisme : Air Force Office of Scientific Research
ID : FA9550-20-1-0114
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