Domain wall transformations and hopping in La0.7Sr0.3MnO3 nanostructures imaged with high resolution x-ray magnetic microscopy
Domain wall transformations and hopping in La0.7Sr0.3MnO3 nanostructures imaged with high resolution x-ray magnetic microscopy
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DOI：
10.1088/0953-8984/26/45/456003
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
S. Finizio;M. Foerster;Benjamin Krueger;C. Vaz;T. Miyawaki;M. Mawass;L. Peña;L. Méchin;S. Hühn;V. Moshnyaga;F. Büttner;A. Bisig;L. Le Guyader;S. El Moussaoui;S. Valencia;F. Kronast;S. Eisebitt;M. Kläui
中科院分区：
文献类型：
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作者：
S. Finizio;M. Foerster;Benjamin Krueger;C. Vaz;T. Miyawaki;M. Mawass;L. Peña;L. Méchin;S. Hühn;V. Moshnyaga;F. Büttner;A. Bisig;L. Le Guyader;S. El Moussaoui;S. Valencia;F. Kronast;S. Eisebitt;M. Kläui
我们研究了电流脉冲注入对La0.7Sr0.3MnO3（LSMO）半环纳米结构中畴壁的影响，在室温下通过高分辨率的X射线磁显微镜。由于LSMO的居里温度很容易达到，我们可以采用合理的电流密度来诱导必要的焦耳加热，以观察不同钉扎位置之间的畴壁跳跃和成核/湮灭事件等效应。这种效应是接近居里温度的主要特征，而自旋力矩被发现在接近室温时起很小的作用。我们也能够观察到热激活畴壁的转变，我们发现，对于分析的几何形状，涡畴壁配置是积极的青睐，与微磁模拟。
We investigate the effect of electric current pulse injection on domain walls in La0.7Sr0.3MnO3 (LSMO) half-ring nanostructures by high resolution x-ray magnetic microscopy at room temperature. Due to the easily accessible Curie temperature of LSMO, we can employ reasonable current densities to induce the Joule heating necessary to observe effects such as hopping of the domain walls between different pinning sites and nucleation/annihilation events. Such effects are the dominant features close to the Curie temperature, while spin torque is found to play a small role close to room temperature. We are also able to observe thermally activated domain wall transformations and we find that, for the analyzed geometries, the vortex domain wall configuration is energetically favored, in agreement with micromagnetic simulations.