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Enhanced room‐temperature magnetoelectric coupling effects in c ‐axis oriented polycrystalline BaSrCo 2‐ x Mg x Fe 11 AlO 22
Author(s) -
Chen XingHan,
Zhai Kun,
Qian GuoYu,
Fu QingShan,
Chakrabarti Chiranjib,
Li CangLong,
Yin HongXia,
Qiu Yang,
Tian ZhaoMing,
Yuan SongLiu
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17717
Subject(s) - superexchange , condensed matter physics , materials science , dielectric , ferromagnetism , annealing (glass) , magnetic anisotropy , magnetization , doping , magnetoelectric effect , anisotropy , magnetic field , multiferroics , physics , ferroelectricity , metallurgy , optoelectronics , quantum mechanics
The influence of applied magnetic field during annealing process as well as of Mg doping on the room‐temperature magnetoelectric coupling effects in BaSrCo 2‐ x Mg x Fe 11 AlO 220 ≤ x ≤ 1.5are experimentally studied through the magnetization, magnetodielectric, and magnetoelectric current measurements. Hexaferrite samples of Co 2 Y were found to be highly oriented by an applied magnetic field ( H o ) during the annealing process, leading to an enhancement of the room‐temperature magnetoelectric coupling effects. Although the substitution of nonmagnetic Mg ions in Co sites tends to reduce the ferromagnetism at macroscopic scale, a proper amount of Mg doping content facilitates the superexchange interaction between the adjacent magnetic blocks; meanwhile modulates the magnetic anisotropy in the samples. An appropriate adjustment of the competition between the anisotropy and the superexchange could enhance the magnetoelectric coupling at room temperature, which can be confirmed by the magnetic‐field‐induced dielectric constant and current density study.