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

Simon, Paul; Wolf, Daniel; Wang, Changhai; Levin, Aleksandr A.; Lubk, Axel; Sturm, Sebastian; Lichte, Hannes; Fecher, Gerhard H.; Felser, Claudia

doi:10.1021/acs.nanolett.5b03102

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

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Simon, Paul
Paul Simon, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wang, Changhai
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Levin, Aleksandr A.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Fecher, Gerhard H.
Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser, Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Simon, P., Wolf, D., Wang, C., Levin, A. A., Lubk, A., Sturm, S., et al. (2016). Synthesis and Three-Dimensional Magnetic Field Mapping of Co₂FeGa Heusler Nanowires at 5 nm Resolution. Nano Letters, 16(1), 114-120. doi:10.1021/acs.nanolett.5b03102.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-7DF8-4

Abstract

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 L2(1) 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.