La2/3(Ca0.2Ba0.8)1/3MnO3/PMN-PT异质薄膜磁特性及其电场调制
La2/3(Ca0.2Ba0.8)1/3MnO3/PMN-PT Heterojunction Magnetic Properties and Their Electric Field Modulation
DOI: 10.12677/app.2026.163016, PDF,    国家自然科学基金支持
作者: 叶煜彤, 王 彤, 陈盈如, 李锦燕, 叶晴莹*, 苏 超, 陈水源：福建师范大学物理与能源学院，福建省量子调控与新能源材料重点实验室，福建 福州
关键词: 钙钛矿锰氧化物；磁电复合薄膜；磁特性；电场调制；Perovskite Manganite； Magnetoelectric Composite Thin Films； Magnetic Properties； Electric-Field Modulation
摘要: 本文采用脉冲激光沉积技术在铁电单晶PMN-PT衬底上制备了La2/3(Ca0.2Ba0.8)1/3MnO3薄膜，测试了其物理特性及电场的调制。XRD衍射结果表明薄膜成相良好；对薄膜进行磁特性测量和分析表明，薄膜在低温区表现出明显的铁磁性，在居里温度243 K附近，薄膜表现出铁磁–顺磁相变；此外，薄膜在较宽温区范围内表现出明显的磁热效应，在2 T磁场下，样品最大磁熵变值达到了2.994 mJ∙cm−3∙K−1。更有意义的是，电场对薄膜的居里温度、磁化强度及磁熵变有明显的影响，其中，在居里温度附近，样品在4 kV/cm电场作用下，其磁化强度(H = 1 T时)从原来的35.26 emu/cm3增加到了44.70 emu/cm3，最大磁熵变值增加到4.641 mJ∙cm−3∙K−1，比原来的磁熵变值高出55.01%。表明样品表现出明显的电场调制磁性，具有丰富的基础物理研究意义，且在传感、电磁探测、能源转化器件领域有着潜在应用前景。
Abstract: In this paper, La2/3 (Ca0.2Ba0.8)1/3MnO3 thin film was fabricated on ferroelectric single-crystal PMN-PT substrate by pulsed laser deposition method. The physical properties and electric-field modulation effects of the sample were investigated. X-ray diffraction (XRD) result indicates that the La2/3 (Ca0.2Ba0.8)1/3MnO3 thin film is well crystallized with pure phase formation. Magnetic measurements reveal that the film exhibits obvious ferromagnetism at low temperature region, and a ferromagnetic-paramagnetic phase transition occurs near the Curie temperature of 243 K. In addition, the film shows a significant magnetocaloric effect over a wide temperature range, with a maximum magnetic entropy change of 2.994 mJ·cm−3∙K−1 under a magnetic field of 2 T. More importantly, the Curie temperature, magnetization, and magnetic entropy change of the film can be effectively modulated by an external electric field. Near the Curie temperature, under an electric field of 4 kV/cm, the magnetization (at H = 1 T) increases from 35.26 emu/cm3 to 44.70 emu/cm3, and the maximum magnetic entropy change is enhanced to 4.641 mJ∙cm−3∙K−1, which is 55.017% higher than the original value. The sample exhibits remarkable electric-field-controlled magnetism, which is of great significance for fundamental physical research and shows potential applications in sensors, electromagnetic detection, and energy conversion devices.
文章引用：叶煜彤, 王彤, 陈盈如, 李锦燕, 叶晴莹, 苏超, 陈水源. La2/3(Ca0.2Ba0.8)1/3MnO3/PMN-PT异质薄膜磁特性及其电场调制[J]. 应用物理, 2026, 16(3): 166-176. https://doi.org/10.12677/app.2026.163016

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