Department of Physics, University of California, Berkeley, California 94720, USA.
Phys Rev Lett. 2010 Jul 9;105(2):027201. doi: 10.1103/PhysRevLett.105.027201. Epub 2010 Jul 6.
We report the formation of a novel ferromagnetic state in the antiferromagnet BiFeO3 at the interface with ferromagnet La(0.7)Sr(0.3)MnO3. Using x-ray magnetic circular dichroism at Mn and Fe L(2,3) edges, we discovered that the development of this ferromagnetic spin structure is strongly associated with the onset of a significant exchange bias. Our results demonstrate that the magnetic state is directly related to an electronic orbital reconstruction at the interface, which is supported by the linearly polarized x-ray absorption measurement at the oxygen K edge.
我们报告了在反铁磁体 BiFeO3 与铁磁体 La(0.7)Sr(0.3)MnO3 的界面上形成一种新的铁磁态。通过 Mn 和 Fe L(2,3)边缘的 X 射线磁圆二色性，我们发现这种铁磁自旋结构的发展与显著的交换偏置的出现密切相关。我们的结果表明，磁状态与界面处的电子轨道重构直接相关，这得到了氧 K 边的线偏振 X 射线吸收测量的支持。
