Magnetic anisotropy plays an important role in the development of manganite-based magnetic devices. Establishing a deeper understanding of the anisotropy in manganites is useful for controlling their magnetic properties. We have studied the structure, lattice strain, and magnetic properties of La_0.5Ba_0.5MnO₃ (LBMO-5) films with the thickness of 12 nm–96 nm, grown on the (001) SrTiO₃ (STO) substrate. The LBMO-5 films are grown with high crystalline quality. The orientation relationship between the LBMO-5 film and the STO substrate [(001)_f//(001)_s, (010)_f//(010)_s, and (100)_f//(100)_s] exists at the film/substrate interface. With increasing the thickness of the film to 48 nm, the LBMO-5 film is fully strain relaxed. The LBMO-5 film shows the out-of-plane magnetic anisotropy (OMA) along the three mutually perpendicular crystalline axis directions. Usually, the manganite films with tetragonal distortion show both the OMA and the in-plane magnetic isotropy. However, the in-plane magnetic anisotropy (IMA) along the two mutually perpendicular in-plane directions ([010]_f and [100]_f) is clearly observed in LBMO-5 films. We attribute this new observation of the IMA to the in-plane structural anisotropy along the two distinct crystalline axes. Our studies provide helpful guidance for the understanding and the tuning of the IMA.

中文翻译：

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锰矿薄膜的面内磁各向异性：一种由结构各向异性引起的新型磁各向异性

磁性各向异性在锰基磁性器件的开发中起着重要作用。建立对锰各向异性的更深入了解对于控制其磁性能很有用。我们研究了在（001）SrTiO ₃（STO）衬底上生长的厚度为12 nm–96 nm的La _0.5 Ba _0.5 MnO ₃（LBMO-5）膜的结构，晶格应变和磁性。LBMO-5薄膜以高结晶质量生长。LBMO-5膜与STO基板[（001）_f //（001）_s，（010）_f //（010）_s和（100）_f //（100）_s）之间的取向关系]存在于膜/基材界面处。随着膜厚度增加到48 nm，LBMO-5膜完全应变松弛。LBMO-5膜沿三个相互垂直的晶轴方向显示面外磁各向异性（OMA）。通常，具有四方形畸变的锰矿薄膜同时显示OMA和面内磁各向同性。然而，在LBMO-5膜中清楚地观察到沿着两个相互垂直的面内方向（[010] _f和[100] _f）的面内磁各向异性（IMA）。我们将对IMA的这一新观察归因于沿两个不同晶轴的面内结构各向异性。我们的研究为理解和调整IMA提供了有用的指导。