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要旨:
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.
