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用脉冲激光沉积法(PLD)制备了Pr5/8Ca3/8MnO3(PCMO)薄膜并对其晶体结构和各向异性磁输运性质进行了研究.LaAlO3(LAO)单晶基片在PCMO薄膜面内的不同方向引入了不同的应力.测量了面内不同方向的磁化曲线和场冷/零场冷(ZFC/FC)曲线,发现具有明显的磁各向异性特征并存在明显的交换偏置现象.研究面内不同方向上交换偏置的特性,给出交换偏置的微观物理图像.同时,对相分离体系中铁磁/反铁磁(FM/AFM)界面特征做了表征,给出了FM/AFM界面附近的微观结构和自旋排布,并对基底与薄膜之间的应力对交换偏置的影响关系以及体系存在的相分离特征进行了讨论.
Pr5 / 8Ca3 / 8MnO3 (PCMO) thin films were prepared by pulsed laser deposition (PLD) and their crystal structures and anisotropic magnetic transport properties were studied.LaAlO3 (LAO) Different stresses were introduced in different directions. The magnetization curves and ZFC / FC curves in different directions were measured and found to have obvious magnetic anisotropy characteristics with obvious exchange bias. In the same time, the characteristics of the ferromagnetic / antiferromagnetic (FM / AFM) interfaces in the phase separation system were characterized, and the FM / AFM The microstructures and the spin distribution near the interface are discussed. The effect of the stress between the substrate and the thin film on the exchange bias and the phase separation characteristics of the system are also discussed.