Quantitative magnetic imaging at the nanometer scale by ballistic electron magnetic microscopy
Quantitative magnetic imaging at the nanometer scale by ballistic electron magnetic microscopy
复制标题
通过弹道电子磁显微镜进行纳米级定量磁成像
DOI：
10.1063/1.4811690
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
P. Turban
中科院分区：
文献类型：
--
作者：
M. Herv'e;S. Tricot;Sophie Gu'ezo;G. Delhaye;B. L'epine;P. Schieffer;P. Turban
我们展示了简单模型Fe(001)纳米结构的定量弹道电子磁性显微镜(BEMM)成像。我们采用原位纳米模板荫罩无阻图案化与分子束外延沉积相结合的方法，在超高真空条件下制备了纳米结构外延Fe/Au/Fe/GaAs(001)自旋阀。在该外延系统中，Fe/GaAs(001)底电极的磁化强度与[110]方向平行，准确地确定了BEMM实验的分析方向。Fe/Au/Fe/GaAs(001)外延自旋阀的大的热电子磁阻使我们可以在Fe(001)微结构上高灵敏度地成像各种稳定的磁组态，即使是在两个磁电极的微小失调的情况下也是如此。利用热电子磁流的角度依赖关系，将微磁模拟得到的磁化图转换为模拟的BEMM图像。计算的BEMM图像和磁化强度旋转轮廓与实验结果定量一致，并使我们能够研究这些模型Fe(001)微结构的磁相图。最后，在高电流密度脉冲下观察到磁畴反转。这为BEMM进一步研究电流感应磁化动力学开辟了道路。
We demonstrate quantitative ballistic electron magnetic microscopy (BEMM) imaging of simple model Fe(001) nanostructures. We use in situ nanostencil shadow mask resistless patterning combined with molecular beam epitaxy deposition to prepare under ultra-high vacuum conditions nanostructured epitaxial Fe/Au/Fe/GaAs(001) spin-valves. In this epitaxial system, the magnetization of the bottom Fe/GaAs(001) electrode is parallel to the [110] direction, defining accurately the analysis direction for the BEMM experiments. The large hot-electron magnetoresistance of the Fe/Au/Fe/GaAs(001) epitaxial spin-valve allows us to image various stable magnetic configurations on the as-grown Fe(001) microstructures with a high sensitivity, even for small misalignments of both magnetic electrodes. The angular dependence of the hot-electron magnetocurrent is used to convert magnetization maps calculated by micromagnetic simulations into simulated BEMM images. The calculated BEMM images and magnetization rotation profiles show quantitative agreement with experiments and allow us to investigate the magnetic phase diagram of these model Fe(001) microstructures. Finally, magnetic domain reversals are observed under high current density pulses. This opens the way for further BEMM investigations of current-induced magnetization dynamics.
单个原子级磁体与自旋极化场发射电子相互作用
影响因子：
8.6
作者：
A. Schlenhoff;A. Sonntag;J. Hermenau;J. Friedlein;S. Krause;R. Wiesendanger
通讯作者：
R. Wiesendanger