9 article(s) from Wiedwald, Ulf
- Full Research Paper
- Published 16 Oct 2018
-
PDF -
Album-
![]()
Figure 1: Bright-field TEM images of size-selected magnetite–gold NPs with in situ synthesized Au seeds: A) M...
-
![]()
Figure 2: XRD patterns of Fe3O4–Au NPs. Panels are sorted by magnetic NP size from bottom to top – samples MN...
-
![]()
Figure 3: HRTEM and corresponding FTT images of size-selected magnetite–gold NPs: MNP-15 (A, C) and MNP-25 (B...
-
![]()
Figure 4: Magnetic properties of Fe3O4–Au hybrid NPs. ZFC/FC curves at B = 5 mT (A). TV indicates the Verwey ...
-
![]()
Figure 5: Inverse of the MRI proton T2-relaxation time as a function of iron concentration for MNP-6, MNP-15,...
-
![]()
Figure 6: MPH experiments (765 kHz, 30 mT). The heating curves of MNP-6 and MNP-25 (3.6 mg·mL−1 Fe) in water ...
-
![]()
Figure 7: Cell viability study (MTS assay) of 4T1 cells after 15 and 30 min incubation with NPs during AMF ex...
-
-
Supp. Info
- Full Research Paper
- Published 24 May 2016
-
PDF -
Album-
![]()
Figure 1: Preparation process of magnetic antidot arrays. After self-assembly of a monolayer monodisperse PS ...
-
![]()
Figure 2: SEM image of Fe antidot array with a period a = 200 nm, an antidot diameter d = 125 nm and a thickn...
-
![]()
Figure 3: Exemplary set of minor loops for 61 reversal fields Hr with ΔHr = 2 Oe from which the FORC density ...
-
![]()
Figure 4: Field profile adapted to minor loop measurements with MOKE. Part 3 and 4 (green and red) are used f...
-
![]()
Figure 5: (a) In-plane hysteresis loops of 20 nm thick Fe antidot arrays with constant period of a = 200 nm a...
-
![]()
Figure 6: Domain pattern of hexagonal Fe antidot arrays with lattice parameter a = 200 nm and hole diameter d...
-
![]()
Figure 7: (a) Schematics of the sample geometry for AMR measurements. The red and blue arrows indicate the di...
-
![]()
Figure 8: Measured AMR curves (a) for the current direction along nearest neighbours (nn) and (b) next neares...
-
![]()
Figure 9: Micromagnetic simulation of hysteresis curves corresponding to the AMR measurements. Hysteresis of ...
-
![]()
Figure 10: (a) Longitudinal and (b) polar Kerr hysteresis loops with an in-plane magnetic field applied along ...
-
![]()
Figure 11: Fe L3 edge XMCD contrast of X-ray micrographs under normal incidence of a hexagonal antidot lattice...
-
![]()
Figure 12: Major hysteresis loops and FORC diagrams of two hexagonal antidot lattices in out-of-plane magnetiz...
-
![]()
Figure 13: Left image: XMCD image of a 43 nm thin FeGd film with antidot diameter of 165 nm and centre-to-cent...
-
- Full Research Paper
- Published 21 Apr 2016
-
PDF -
Album-
![]()
Figure 1: Cross-section HRTEM images of small (2–3 nm) FePt NPs on a MgO(001) substrate after annealing at 65...
-
![]()
Figure 2: 3 nm thick FePt film on SiO2/Si(001) substrate after annealing at 650 °C for 30 min: (a) RHEED patt...
-
![]()
Figure 3: Example of an AFM image (left) and height histogram (right) of micellar FePt NPs on SiO2/Si(001) af...
-
![]()
Figure 4: RHEED patterns of 7.6 nm FePt NPs on SiO2/Si(001) after different annealing steps (a) 570 °C for 60...
-
![]()
Figure 5: (a–c) RHEED patterns of a FePt film on Al2O3(0001), recorded with an electron beam energy of 25 keV...
-
![]()
Figure 6: RHEED images of FePt NPs on sapphire(0001) single crystals after several annealing steps, recorded ...
-
![]()
Figure 7: (a–d) RHEED pattern of a FePt film on MgO(100), recorded with an electron beam energy of 25 keV aft...
-
![]()
Figure 8: (a–c) RHEED patterns of large (5–6 nm) FePt nanoparticles prepared on MgO(001), recorded with an el...
-
![]()
Figure 9: RHEED pattern of 2–3 nm FePt particles on MgO(001), recorded with an beam energy of 25 keV after an...
-
![]()
Figure 10: AFM image and height histogram of 2–3 nm FePt nanoparticles on MgO(001) after annealing at 650 °C f...
-
- Full Research Paper
- Published 31 Jul 2013
-
PDF -
Album-
![]()
Figure 1: RBS spectra of FeGa3 (a) and CoGa3 (b) films deposited onto Si substrates. RUMP simulations (solid ...
-
![]()
Figure 2: Electrical resistivity of FeGa3, CoGa3 and Fe0.75Co0.25Ga3 films as a function of temperature. The ...
-
![]()
Figure 3: Seebeck coefficients of FeGa3, CoGa3 and Fe0,75Co0,25Ga3 films deposited on thin glass substrates m...
-
- Full Research Paper
- Published 07 Dec 2012
-
PDF -
Album-
![]()
Figure 1: Principle of percolated perpendicular media. The exchange-coupled film is interspersed by nonmagnet...
-
![]()
Figure 2: Schematics of the sample preparation. Self-assembled, close-packed monolayers of PS spheres are dep...
-
![]()
Figure 3: Size reduction of PS spheres as a function of etching time in isotropic oxygen plasma at ambient te...
-
![]()
Figure 4: SEM images of monolayer assemblies of commercial Au nanoparticles with (a) 60 nm diameter and (b) 4...
-
![]()
Figure 5: (a) Magnetic hysteresis loops of a percolated Fe film (a = 95 nm, d = 66 nm, t = 17 nm) and a thin-...
-
![]()
Figure 6: (a) Scanning transmission X-ray microscopy images of Fe films taken with right circularly polarized...
-
![]()
Figure 7: (a–i) MFM images of the same spot taken in different perpendicular fields after driving the sample ...
-
![]()
Figure 8: (a) DF-STEM image of 40 nm Au nanoparticles capped with a magnetic Co/Pt multilayer. Panel (b) show...
-
![]()
Figure 9: (a) MOKE remanence curves for Co/Pt multilayers grown on a planar substrate as well as on arrays of...
-
- Full Research Paper
- Published 23 Aug 2011
-
PDF -
Album-
![]()
Figure 1: (a) XRD of Pt films on STO(100) and MgO(100) in Bragg–Brentano geometry. The diffractograms clearly...
-
![]()
Figure 2: SEM images of Co NPs on Pt(111)/MgO(100) and Pt(100)/STO(100) are displayed in panels (a) and (b), ...
-
![]()
Figure 3: AFM height distributions of Co NPs on Pt(111)/MgO(100) in the as-prepared state and after annealing...
-
![]()
Figure 4: Panel (a) shows XMCD difference spectra for Co NPs on Pt(111) in the as-prepared state and after an...
-
![]()
Figure 5: Element specific XMCD hysteresis loops measured at the Co L3 maximum dichroic signal at T = 12 K an...
-
![]()
Figure 6: (a) In-plane hysteresis loops measured by SQUID magnetometry at T = 29 K, i.e., close to the compen...
-
![]()
Figure 7: Bright field TEM images of Co NPs on Pt(100) films after annealing at TA = 250 °C (as-prepared stat...
-
![]()
Figure 8: HRTEM image of annealed Co NPs on Pt(100) film after TA = 500 °C for 30 min. The arrows indicate a ...
-
![]()
Figure 9: The left image shows the high angle annular dark-field (HAADF) image of the sample shown in Figure 8 using ...
-
![]()
Figure 10: Proposed model of local alloying and diffusion of Co NPs on Pt films. Details are discussed in the ...
-
-
Video
- Full Research Paper
- Published 01 Jun 2011
-
PDF -
Album-
![]()
Figure 1: Scanning electron micrograph of Fe nanoparticles deposited on Si. The average particle size observe...
-
![]()
Figure 2: Transmission electron microscope image of Fe nanoparticles (dark contrast) coated with a thin SiOx ...
-
![]()
Figure 3: Electron diffraction pattern of the Fe nanoparticles. The Miller indices of the respective lattice ...
-
![]()
Figure 4: X-ray diffraction patterns (Cu Kα radiation) of Fe nanoparticles embedded in a Cu film on a Ta subs...
-
![]()
Figure 5: In-plane hysteresis curves of the embedded Fe nanoparticles measured at 10 K in as-prepared state (...
-
![]()
Figure 6: In-plane hysteresis curves of the embedded Fe nanoparticles after loading of the Ta substrate with ...
-
![]()
Figure 7: ZFC (circles) and FC (squares) magnetization curves of the Fe nanoparticles embedded in Cu film in ...
-
- Full Research Paper
- Published 22 Nov 2010
-
PDF -
Album-
![]()
Scheme 1: Preparation of NPs by a reverse micelle technique. PS-b-P2VP or PS-b-P4VP is dispersed in anhydrous...
-
![]()
Figure 1: CoCl2 loaded PS(1779)-b-P2VP(857) reverse micelles deposited at different dip-coating velocities; (...
-
![]()
Figure 2: Co NPs prepared from CoCl2-loaded PS(1779)-b-P2VP(857) reverse micelles deposited on a Si AFM-tip b...
-
![]()
Figure 3: Fe (left column) and Co (right column) NPs prepared from PS(312)-P2VP(71) (upper panels) and PS(177...
-
![]()
Figure 4: SEM micrographs of FePt NPs with 2.6 nm, 4.5 nm, and 9.4 nm diameter (top panels) and their AFM hei...
-
![]()
Figure 5: Photoelectron spectroscopy of Co-precursor loaded PS(1779)-P2VP(857) reverse micelles after differe...
-
![]()
Figure 6: Pt-4f and Fe-2p XPS spectra of 9.8 nm FePt particles before and after exposure to ambient air for 2...
-
![]()
Figure 7: TEM images of 3 nm FePt NPs on Si/SiO2 after annealing at 650 °C for 90 min. (a) Bright-field TEM i...
-
![]()
Figure 8: Aberration corrected HRTEM images of FePt particles seen along [100] direction. The L10 ordering al...
-
![]()
Figure 9: Aberration corrected HR-TEM images of about 8 nm FePt NPs in [101] orientation. Crystal defects such as ...
-
![]()
Figure 10: (a) Schematics of the compensation approach: Temperature dependence of the magnetic susceptibility ...
-
![]()
Figure 11: (a) DC-demagnetization and isothermal remanent magnetization of 8 nm Co particles measured by SQUID...
-
![]()
Figure 12: Element-specific magnetic hysteresis loops of 5.8 nm FePt NPs taken at the Fe-L3 edge at T = 11 K a...
-
![]()
Figure 13: Coercive field at T = 300 K as function of the diameter of FePt NPs after annealing for 30 min at T...
-
![]()
Figure 14: Experimental hysteresis loops of 5.8 nm FePt NPs at 11 K and simulations using a bimodal Gaussian K...
-
![]()
Figure 15: Distributions of the effective anisotropy Keff for arrays of differently sized NPs used for simulat...
-
![]()
Figure 16: (a) Coercive fields at T = 11 K and T = 300 K as function of 30 min annealing time at temperature TA...
-
![]()
Figure 17: Co-L3,2 XA and XMCD spectra of 5.6 nm Co56Pt44 NPs after annealing at 700 °C taken at external fiel...
-
![]()
Figure 18: Element-specific magnetic hysteresis loops of 5.8 nm Co56Pt44 NPs taken at the Co-L3 edge maximum d...
-
![]()
Figure 19: SEM images of 8 nm Co-based NP after oxygen plasma (a) and after Au photoseeding of reduced particl...
-
-
Video
