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Ferroelectric substrate effects on the magnetism, magnetotransport, and electroresistance of La0.7Ca0.3MnO3 thin films on BaTiO3

机译:铁电基底对BaTiO3上La0.7Ca0.3MnO3薄膜的磁性,磁传输和电阻的影响

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摘要

La 0.7Ca 0.3MnO 3 optimally doped epitaxial films were grown on ferroelectric BaTiO 3 substrates. Electronic transport (magnetoresistance and electroresistance) and magnetic properties showed important anomalies in the temperature interval between 60 and 150 K, below the metal-insulator transition. Scanning probe microscopy revealed changes in BaTiO 3 surface morphology at those temperatures. La 0.7Ca 0.3MnO 3 thickness is a critical factor: 120-thick films showed large anomalies sensitive to electric poling of the BaTiO 3, whereas the behavior of 150-thick films is closer to that of the reference La 0.7Ca 0.3MnO 3 samples grown on SrTiO 3. We propose that, through inhomogenous strain and electric polarization effects, the ferroelectric substrate induces an inhomogenous spin distribution in the magnetic layer. This would imply the coexistence of in-plane and out-of-plane ferromagnetic patches in La 0.7Ca 0.3MnO 3, possibly interspersed with antiferromagnetic regions, as it has recently been theoretically predicted. Substrate poling effects are investigated, and a magnetoelectric coupling is demonstrated. © 2012 American Physical Society.
机译:在铁电BaTiO 3衬底上生长La 0.7Ca 0.3MnO 3最佳掺杂外延膜。电子传输(磁阻和电阻)和磁性能在低于金属-绝缘体转变温度的60至150 K的温度区间内显示出重要异常。扫描探针显微镜显示在这些温度下BaTiO 3表面形态的变化。 La 0.7Ca 0.3MnO 3的厚度是一个关键因素:120厚度的膜对BaTiO 3的电极化表现出较大的异常,而150厚度的膜的行为更接近于参比的La 0.7Ca 0.3MnO 3样品我们提出,通过不均匀的应变和电极化效应,铁电基体在磁性层中引起不均匀的自旋分布。这意味着,在La 0.7Ca 0.3MnO 3中,面内和面外铁磁片可能同时存在反铁磁区,这在理论上已经得到了预测。研究了基板极化效应,并演示了磁电耦合。 ©2012美国物理学会。

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