title: Synthesis and Three-Dimensional Magnetic Field Mapping of Co2FeGa Heusler Nanowires at 5 nm Resolution.
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 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.
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Paul
authors.initials: P
authors.lastname: Simon
authors.affiliation: Institute of Structure Physics, Triebenberg Laboratory, Technical University of Dresden , Zum Triebenberg 50, 01328 Dresden Zaschendorf, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: Wolf
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Changhai
authors.initials: C
authors.lastname: Wang
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Aleksandr A
authors.initials: AA
authors.lastname: Levin
authors.affiliation: Institute of Structure Physics, Triebenberg Laboratory, Technical University of Dresden , Zum Triebenberg 50, 01328 Dresden Zaschendorf, Germany.
authors.forename: Axel
authors.initials: A
authors.lastname: Lubk
authors.affiliation: Institute of Structure Physics, Triebenberg Laboratory, Technical University of Dresden , Zum Triebenberg 50, 01328 Dresden Zaschendorf, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Sturm
authors.affiliation: Institute of Structure Physics, Triebenberg Laboratory, Technical University of Dresden , Zum Triebenberg 50, 01328 Dresden Zaschendorf, Germany.
authors.forename: Hannes
authors.initials: H
authors.lastname: Lichte
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Gerhard H
authors.initials: GH
authors.lastname: Fecher
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Felser
keywords: Heusler nanowires; electron holographic tomography; ferromagnetism; magnetic induction mapping