Growth and Ferromagnetic Properties of Ferroelectric YbMnO3 Thin Films
Growth and Ferromagnetic Properties of Ferroelectric YbMnO3 Thin Films
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DOI：
10.1143/jjap.45.7329
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发表时间：
2006-09
影响因子：
1.5
通讯作者：
Tetsuya Takahashi;T. Yoshimura;N. Fujimura
中科院分区：
文献类型：
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作者：
Tetsuya Takahashi;T. Yoshimura;N. Fujimura
采用脉冲激光沉积法（PLD）在（111）Pt/（0001）蓝宝石衬底上生长了YbMnO 3薄膜。为了研究烧蚀条件，用发射光谱法（OES）分析了YbMnO 3的等离子体羽流。据发现，Mn是更容易从目标烧蚀比Yb在沉积的初始阶段。因此，在等离子体羽流变得稳定之后开始沉积。通过优化沉积条件，在衬底温度为760 °C，沉积气压为50 mTorr的条件下，获得了化学计量比的YbMnO 3（0001）薄膜。YbMnO 3薄膜在室温下表现出明显的铁电极化-电场磁滞回线，其回复极化为1.4 µC/cm 2。当在低于70 K时通过沿YbMnO 3的c轴沿着施加磁场进行磁化测量时，也观察到铁磁行为。
YbMnO3 films were grown by pulsed laser deposition (PLD) on (111) Pt/(0001) sapphire substrates. To investigate the ablation conditions, the plasma plume of YbMnO3 was analyzed by optical emission spectrometry (OES). It was found that Mn is ablated from a target more easily than Yb at the initial period of the deposition. Therefore, deposition was initiated after the plasma plume had become stable. After the optimization of the deposition conditions, YbMnO3(0001) films with stoichiometric composition were obtained at a substrate temperature of 760 °C and a deposition pressure of 50 mTorr. The YbMnO3 films showed a distinct ferroelectric polarization–electric field hysteresis loop with a remanent polarization of 1.4 µC/cm2 at room temperature. Ferromagnetic behavior was also observed when the magnetization measurements were performed by applying a magnetic field along the c-axis of YbMnO3 below 70 K.