Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface
Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface
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DOI：
10.1038/nmat4341
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发表时间：
2015-09-01
期刊：
影响因子：
41.2
通讯作者：
Cavalleri, A.
中科院分区：
文献类型：
--
作者：
Foerst, M.;Caviglia, A. D.;Cavalleri, A.
复杂氧化物异质结构中的静态应变（1，2）已广泛用于设计平衡时的电子和磁性（3）。在相同的精神，晶格的变形与光可以用来实现功能的控制，通过异质界面动态（4）。在这里，通过激发大振幅的红外线活性振动在LaAlO3基板，我们诱导磁性顺序熔化在NdNiO3薄膜的异质界面。飞秒共振软X射线衍射被用来确定磁无序的时空演变。我们观察到一个磁性熔体前，从基板界面传播到薄膜中，在一个速度，建议电子驱动的运动。异质界面处的光控制和超快相位波前传播可能会导致光磁性的新机会，例如通过驱动畴壁运动来在适当设计的设备上传输信息。
Static strain in complex oxide heterostructures(1,2) has been extensively used to engineer electronic and magnetic properties at equilibrium(3). In the same spirit, deformations of the crystal lattice with light may be used to achieve functional control across heterointerfaces dynamically(4). Here, by exciting large-amplitude infrared-active vibrations in a LaAlO3 substrate we induce magnetic order melting in a NdNiO3 film across a heterointerface. Femtosecond resonant soft X-ray diffraction is used to determine the spatiotemporal evolution of the magnetic disordering. We observe a magnetic melt front that propagates from the substrate interface into the film, at a speed that suggests electronically driven motion. Light control and ultrafast phase front propagation at heterointerfaces may lead to new opportunities in optomagnetism, for example by driving domain wall motion to transport information across suitably designed devices.