Realizing robust magnetoelectric(ME)coupling effect near room temperature is still a long-standing challenge for the application of multiferroic materials in next-generation low-power spintronic and memory devices.Her...Realizing robust magnetoelectric(ME)coupling effect near room temperature is still a long-standing challenge for the application of multiferroic materials in next-generation low-power spintronic and memory devices.Here we report a systematic study on the magnetic,dielectric,and ME coupling properties of Y-type hexaferrite Ba_(0.5)Sr_(1.5)Co_(2)Fe_(12-x)Al_(x)O_(22)(x=0.0,0.5,1.0)single crystals.The Al doping can induce the shifting of the alternating longitudinal conical(ALC)-proper screw(PS)magnetic phase transition temperature from 200 K for x?0e365 K for x-1.0.The most interesting feature is that the Ba_(0.5)Sr_(1.5)Co_(2)Fe_(11)AlO_(22) single crystal displays a direct and converse ME coupling coefficient with aH~3,100 ps/m and aE~3,900 ps/m at 250 K,respectively,due to the Al-doped enhanced stability of ALC phase.Moreover,the exchange bias also verifies the strong coupling of electric and magnetic orders.These results provide a valuable insight on the modulation of ALC structure and the mechanism of ME effect in Y-type hexaferrites.展开更多
基金supported by the National Key Research Program of China(2022YFB3807603)the Science and Technology Projects in Guangzhou(202201000008)+2 种基金the Guangdong Provincial Key Laboratory(2020B1212060066)the National Natural Science Foundation of China(Grants Nos.52272108,and 52002134)the Hubei Provincial Natural Science Foundation of China(2023AFA105).
文摘Realizing robust magnetoelectric(ME)coupling effect near room temperature is still a long-standing challenge for the application of multiferroic materials in next-generation low-power spintronic and memory devices.Here we report a systematic study on the magnetic,dielectric,and ME coupling properties of Y-type hexaferrite Ba_(0.5)Sr_(1.5)Co_(2)Fe_(12-x)Al_(x)O_(22)(x=0.0,0.5,1.0)single crystals.The Al doping can induce the shifting of the alternating longitudinal conical(ALC)-proper screw(PS)magnetic phase transition temperature from 200 K for x?0e365 K for x-1.0.The most interesting feature is that the Ba_(0.5)Sr_(1.5)Co_(2)Fe_(11)AlO_(22) single crystal displays a direct and converse ME coupling coefficient with aH~3,100 ps/m and aE~3,900 ps/m at 250 K,respectively,due to the Al-doped enhanced stability of ALC phase.Moreover,the exchange bias also verifies the strong coupling of electric and magnetic orders.These results provide a valuable insight on the modulation of ALC structure and the mechanism of ME effect in Y-type hexaferrites.
