Synthesis and Three-Dimensional Magnetic Field Mapping of Co2FeGa Heusler Nanowires at 5 nm Resolution

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• 作者：Paul Simon ; Daniel Wolf ; Changhai Wang ; Aleksandr A. Levin ; Axel Lubk ; Sebastian Sturm ; Hannes Lichte ; Gerhard H. Fecher ; Claudia Felser
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：January 13, 2016
• 年：2016
• 卷：16
• 期：1
• 页码：114-120
• 全文大小：588K
• ISSN：1530-6992

文摘

We present the synthesis of Co₂FeGa Heusler nanowires and the results of our investigations on their three-dimensional (3D) electric and magnetic internal and external fields mapped by electron holographic tomography (EHT). These fields will be of great importance in next-generation nanomagnets integrated in spintronics and memory devices. The Co₂FeGa nanowires with a L2₁ ordered structure are prepared by a SBA-15 silica-assisted method. The magnetic dipole-like stray fields of several Co₂FeGa nanowires are revealed by holographically reconstructed phase images. Based on the measured magnetic phase shifts of an individual nanowire and its 3D reconstruction using EHT, we obtain an internal magnetic induction with a magnitude of 1.15 T and a nonmagnetic surface layer of 10 nm thickness. Furthermore, we also reconstruct the 3D distribution of the electrostatic potential of the same nanowire.