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Magnetic field observations in CoFeB/Ta layers with 0.67-nm resolution by electron holography

机译:电子全息图在CoFeB / Ta层中以0.67 nm分辨率观察磁场

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摘要

Nanometre-scale magnetic field distributions in materials such as those at oxide interfaces, in thin layers of spintronics devices, and at boundaries in magnets have become important research targets in materials science and applied physics. Electron holography has advantages in nanometric magnetic field observations, and the realization of aberration correctors has improved its spatial resolution. Here we show the subnanometre magnetic field observations inside a sample at 0.67-nm resolution achieved by an aberration-corrected 1.2-MV holography electron microscope with a pulse magnetization system. A magnetization reduction due to intermixing in a CoFeB/Ta multilayer is analyzed by observing magnetic field and electrostatic potential distributions simultaneously. Our results demonstrate that high-voltage electron holography can be widely applied to pin-point magnetization analysis with structural and composition information in physics, chemistry, and materials science.
机译:材料中的纳米级磁场分布,例如氧化物界面处,自旋电子器件薄层中以及磁体边界处的磁场分布,已成为材料科学和应用物理学中的重要研究目标。电子全息术在纳米磁场观察中具有优势,并且像差校正器的实现提高了其空间分辨率。在这里,我们显示了通过具有脉冲磁化系统的像差校正的1.2-MV全息电子显微镜在0.67 nm分辨率下在样品内部进行的亚纳米磁场观察。通过同时观察磁场和静电势分布,分析了由于在CoFeB / Ta多层体中混合而导致的磁化强度降低。我们的结果表明,高压电子全息图可广泛应用于具有物理,化学和材料科学领域的结构和成分信息的精确磁化分析。

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