Limits...
3D Magnetic Induction Maps of Nanoscale Materials Revealed by Electron Holographic Tomography.

Wolf D, Rodriguez LA, Béché A, Javon E, Serrano L, Magen C, Gatel C, Lubk A, Lichte H, Bals S, Van Tendeloo G, Fernández-Pacheco A, De Teresa JM, Snoeck E - Chem Mater (2015)

Bottom Line: The investigation of three-dimensional (3D) ferromagnetic nanoscale materials constitutes one of the key research areas of the current magnetism roadmap and carries great potential to impact areas such as data storage, sensing, and biomagnetism.Up to now, quantitative 3D maps providing both the internal magnetic and electric configuration of the same specimen with high spatial resolution are missing.The powerful approach presented here is widely applicable to a broad range of 3D magnetic nanostructures and may trigger the progress of novel spintronic nonplanar nanodevices.

View Article: PubMed Central - PubMed

Affiliation: Triebenberg Laboratory, Institute of Structural Physics, Technische Universität Dresden , 01062 Dresden, Saxony, Germany.

ABSTRACT

The investigation of three-dimensional (3D) ferromagnetic nanoscale materials constitutes one of the key research areas of the current magnetism roadmap and carries great potential to impact areas such as data storage, sensing, and biomagnetism. The properties of such nanostructures are closely connected with their 3D magnetic nanostructure, making their determination highly valuable. Up to now, quantitative 3D maps providing both the internal magnetic and electric configuration of the same specimen with high spatial resolution are missing. Here, we demonstrate the quantitative 3D reconstruction of the dominant axial component of the magnetic induction and electrostatic potential within a cobalt nanowire (NW) of 100 nm in diameter with spatial resolution below 10 nm by applying electron holographic tomography. The tomogram was obtained using a dedicated TEM sample holder for acquisition, in combination with advanced alignment and tomographic reconstruction routines. The powerful approach presented here is widely applicable to a broad range of 3D magnetic nanostructures and may trigger the progress of novel spintronic nonplanar nanodevices.

No MeSH data available.


Related in: MedlinePlus

Electricpotential and axial magnetic B-field component of a Conanowire. (a) Volume rendering, i.e. the colors correspond to thepotential/B-field values. (b) 15 nm thick 2D slices through the 3Ddata as indicated by the orange boxes in (a). (c) Histograms of 3Dvolumes and 1D line profiles along the arrows marked in (b). The peakin the histogram of the electric potential at 21.5 V can be interpretedas the mean inner potential of this Co NW. The most frequent valuein the histogram of the magnetic induction is at −0.9 T.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4862384&req=5

fig3: Electricpotential and axial magnetic B-field component of a Conanowire. (a) Volume rendering, i.e. the colors correspond to thepotential/B-field values. (b) 15 nm thick 2D slices through the 3Ddata as indicated by the orange boxes in (a). (c) Histograms of 3Dvolumes and 1D line profiles along the arrows marked in (b). The peakin the histogram of the electric potential at 21.5 V can be interpretedas the mean inner potential of this Co NW. The most frequent valuein the histogram of the magnetic induction is at −0.9 T.

Mentions: This leads to improved convergenceproperties of the tomographicreconstruction. Here, the number of iterations was determined by visuallyinspecting the spatial resolution and noise of the reconstructionfor an optimal balance. The spatial resolution of the 3D reconstructionis below 10 nm, as we demonstrate by determination of the width ofthe edge-spread function in six different directions on a representativecross-section of the Co NW (see the SupportingInformation). The 3D distributions of the electric potentialand the axial magnetic induction of the Co NW reconstructed by EHTare shown in Figure 3. Here, we analyze only the B-field inside the sample where the correspondingelectric potential is V ≥ 16 V, because the edge regions are affected by artifacts as mentionedabove. A tomographic reconstruction of the stray field only is shownin the Supporting Information.


3D Magnetic Induction Maps of Nanoscale Materials Revealed by Electron Holographic Tomography.

Wolf D, Rodriguez LA, Béché A, Javon E, Serrano L, Magen C, Gatel C, Lubk A, Lichte H, Bals S, Van Tendeloo G, Fernández-Pacheco A, De Teresa JM, Snoeck E - Chem Mater (2015)

Electricpotential and axial magnetic B-field component of a Conanowire. (a) Volume rendering, i.e. the colors correspond to thepotential/B-field values. (b) 15 nm thick 2D slices through the 3Ddata as indicated by the orange boxes in (a). (c) Histograms of 3Dvolumes and 1D line profiles along the arrows marked in (b). The peakin the histogram of the electric potential at 21.5 V can be interpretedas the mean inner potential of this Co NW. The most frequent valuein the histogram of the magnetic induction is at −0.9 T.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4862384&req=5

fig3: Electricpotential and axial magnetic B-field component of a Conanowire. (a) Volume rendering, i.e. the colors correspond to thepotential/B-field values. (b) 15 nm thick 2D slices through the 3Ddata as indicated by the orange boxes in (a). (c) Histograms of 3Dvolumes and 1D line profiles along the arrows marked in (b). The peakin the histogram of the electric potential at 21.5 V can be interpretedas the mean inner potential of this Co NW. The most frequent valuein the histogram of the magnetic induction is at −0.9 T.
Mentions: This leads to improved convergenceproperties of the tomographicreconstruction. Here, the number of iterations was determined by visuallyinspecting the spatial resolution and noise of the reconstructionfor an optimal balance. The spatial resolution of the 3D reconstructionis below 10 nm, as we demonstrate by determination of the width ofthe edge-spread function in six different directions on a representativecross-section of the Co NW (see the SupportingInformation). The 3D distributions of the electric potentialand the axial magnetic induction of the Co NW reconstructed by EHTare shown in Figure 3. Here, we analyze only the B-field inside the sample where the correspondingelectric potential is V ≥ 16 V, because the edge regions are affected by artifacts as mentionedabove. A tomographic reconstruction of the stray field only is shownin the Supporting Information.

Bottom Line: The investigation of three-dimensional (3D) ferromagnetic nanoscale materials constitutes one of the key research areas of the current magnetism roadmap and carries great potential to impact areas such as data storage, sensing, and biomagnetism.Up to now, quantitative 3D maps providing both the internal magnetic and electric configuration of the same specimen with high spatial resolution are missing.The powerful approach presented here is widely applicable to a broad range of 3D magnetic nanostructures and may trigger the progress of novel spintronic nonplanar nanodevices.

View Article: PubMed Central - PubMed

Affiliation: Triebenberg Laboratory, Institute of Structural Physics, Technische Universität Dresden , 01062 Dresden, Saxony, Germany.

ABSTRACT

The investigation of three-dimensional (3D) ferromagnetic nanoscale materials constitutes one of the key research areas of the current magnetism roadmap and carries great potential to impact areas such as data storage, sensing, and biomagnetism. The properties of such nanostructures are closely connected with their 3D magnetic nanostructure, making their determination highly valuable. Up to now, quantitative 3D maps providing both the internal magnetic and electric configuration of the same specimen with high spatial resolution are missing. Here, we demonstrate the quantitative 3D reconstruction of the dominant axial component of the magnetic induction and electrostatic potential within a cobalt nanowire (NW) of 100 nm in diameter with spatial resolution below 10 nm by applying electron holographic tomography. The tomogram was obtained using a dedicated TEM sample holder for acquisition, in combination with advanced alignment and tomographic reconstruction routines. The powerful approach presented here is widely applicable to a broad range of 3D magnetic nanostructures and may trigger the progress of novel spintronic nonplanar nanodevices.

No MeSH data available.


Related in: MedlinePlus