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Control of Magnetoelectric Coupling in the Co2Y-Type Hexaferrites



Chang B. Park, Kwang W. Shin, Sae H. Chun, Jun H. Lee, Yoon S. Oh, Steven M. Disseler, Colin A. Heikes, William D. Ratcliff, Woo-Suk Noh, Jae-Hoon Park, Kee H. Kim


We comprehensively investigated the magnetic, ferroelectric, and ME properties of Ba2-xSrxCo2(Fe1-yAly)12O22 single crystals in broad doping ranges of Sr (1.0 less than or equal to} x less than or equal to} 1.8) and Al (0.00 less than or equal to} y less than or equal to} 0.08). Most of the investigated compounds exhibit an intriguing coexistence of two apparently competing magnetic phases: a transverse conical (TC) and alternating longitudinal conical (ALC) spin structure. The magnetic properties show that the Ba0.2Sr1.8Co2(Fe0.98Al0.04)12O22 crystal has the highest ordering temperature and largest volume fraction of the ALC phase at zero H; further, after the application of an in-plane H, it exhibits a maximized volume fraction of the metastable TC phase, resulting in the highest ME susceptibility and electric polarization at all temperatures below 300 K. Our findings demonstrate that securing the thermal stability of the ALC phase is a crucial prerequisite to achieve optimized ME coupling in Co2Y-type hexaferrites, pointing to a general strategy applicable to other hexaferrites as well
Physical Review Materials


neutron, magnetism, multiferroic


Park, C. , Shin, K. , Chun, S. , Lee, J. , Oh, Y. , Disseler, S. , Heikes, C. , Ratcliff, W. , Noh, W. , Park, J. and Kim, K. (2021), Control of Magnetoelectric Coupling in the Co<sub>2</sub>Y-Type Hexaferrites, Physical Review Materials (Accessed April 14, 2024)
Created March 15, 2021, Updated September 7, 2021