Magnetoelectric (ME) composites exhibit robust ME interfacial coupling due to strong interaction between piezoelectricity and magnetostriction. The presence of two novel functionalities i.e., direct ME coupling, magnetic field control of ferroelectric polarization, and converse ME coupling, electric field control of magnetization makes them ideal candidates for multifunctional devices such as energy harvesters, magnetic field sensors, ME random access memories, ME antennas, etc. The ME coupling in these ME composites is strongly dependent on the superior physical properties of the piezoelectric and magnetostrictive materials. Therefore, magnetostrictive materials with excellent piezomagnetic coefficients and piezoelectric materials with excellent piezoelectric coefficients are desired to achieve large ME coupling. Among piezoelectric materials, ferroelectric relaxor-PbTiO₃ (PT) single crystals have been extensively used as a piezoelectric constituent due to their ultrahigh piezoelectric and electromechanical properties. In addition, the domain structure and crystal orientation of the relaxor-PT single crystals exhibit extraordinarily large piezoelectric and electromechanical properties. Due to those multifunctional properties, relaxor-PT single crystal-based ME composites were widely used to study direct and converse ME couplings in ME composites in recent days. Relaxor-PT single crystal-based ME composites indeed showed excellent ME coupling, for instance, the highest ME voltage coefficient, equivalent magnetic noise, and output power of 7000 Vcm^-1Oe^-1 @ 23.23 kHz, 6pT//√Hz @1 Hz and 19 mW @ 60 Hz, respectively which are one of the best-reported values so far in ME composites. Considering the vast research on relaxor-PT single crystal-based ME composites, here we present a detailed review on recent trends in ME composites and ME devices based on relaxor-PT single crystals.

由于压电和磁致伸缩之间的强相互作用，磁电 (ME) 复合材料表现出强大的 ME 界面耦合。两个新颖功能的存在，即直接 ME 耦合、铁电极化的磁场控制和反向 ME 耦合、磁化的电场控制使它们成为多功能设备的理想候选者，如能量收集器、磁场传感器、ME 随机存取存储器、 ME 天线等。这些 ME 复合材料中的 ME 耦合在很大程度上取决于压电和磁致伸缩材料的优异物理特性。因此，需要具有优异压磁系数的磁致伸缩材料和具有优异压电系数的压电材料来实现大ME耦合。在压电材料中，₃ (PT) 单晶由于其超高压电和机电性能而被广泛用作压电元件。此外，弛豫-PT单晶的畴结构和晶体取向表现出非常大的压电和机电性能。由于这些多功能特性，最近几天，弛豫-PT 单晶基 ME 复合材料被广泛用于研究 ME 复合材料中的直接和逆向 ME 耦合。基于 Relaxor-PT 单晶的 ME 复合材料确实表现出优异的 ME 耦合，例如，最高的 ME 电压系数、等效磁噪声和 7000 Vcm ^-1 Oe ^{-1的输出功率}@ 23.23 kHz、6pT//√Hz @1 Hz 和 19 mW @ 60 Hz，这分别是迄今为止 ME 复合材料中报告最好的值之一。考虑到对基于弛豫-PT 单晶的 ME 复合材料的大量研究，我们在这里详细回顾了基于弛豫-PT 单晶的 ME 复合材料和 ME 器件的最新趋势。