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3 article(s) from Han, Luyang

Nanoscaled alloy formation from self-assembled elemental Co nanoparticles on top of Pt films

Luyang Han,
Ulf Wiedwald,
Johannes Biskupek,
Kai Fauth,
Ute Kaiser and
Paul Ziemann

Beilstein J. Nanotechnol. 2011, 2, 473–485, doi:10.3762/bjnano.2.51

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Figure 1: (a) XRD of Pt films on STO(100) and MgO(100) in Bragg–Brentano geometry. The diffractograms clearly...

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Figure 2: SEM images of Co NPs on Pt(111)/MgO(100) and Pt(100)/STO(100) are displayed in panels (a) and (b), ...

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Figure 3: AFM height distributions of Co NPs on Pt(111)/MgO(100) in the as-prepared state and after annealing...

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Figure 4: Panel (a) shows XMCD difference spectra for Co NPs on Pt(111) in the as-prepared state and after an...

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Figure 5: Element specific XMCD hysteresis loops measured at the Co L₃ maximum dichroic signal at T = 12 K an...

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Figure 6: (a) In-plane hysteresis loops measured by SQUID magnetometry at T = 29 K, i.e., close to the compen...

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Figure 7: Bright field TEM images of Co NPs on Pt(100) films after annealing at T_A = 250 °C (as-prepared stat...

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Figure 8: HRTEM image of annealed Co NPs on Pt(100) film after T_A = 500 °C for 30 min. The arrows indicate a ...

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Figure 9: The left image shows the high angle annular dark-field (HAADF) image of the sample shown in Figure 8 using ...

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Figure 10: Proposed model of local alloying and diffusion of Co NPs on Pt films. Details are discussed in the ...

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Full Research Paper

Published 23 Aug 2011

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Effect of large mechanical stress on the magnetic properties of embedded Fe nanoparticles

Srinivasa Saranu,
Sören Selve,
Ute Kaiser,
Luyang Han,
Ulf Wiedwald,
Paul Ziemann and
Ulrich Herr

Beilstein J. Nanotechnol. 2011, 2, 268–275, doi:10.3762/bjnano.2.31

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Figure 1: Scanning electron micrograph of Fe nanoparticles deposited on Si. The average particle size observe...

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Figure 2: Transmission electron microscope image of Fe nanoparticles (dark contrast) coated with a thin SiO_x ...

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Figure 3: Electron diffraction pattern of the Fe nanoparticles. The Miller indices of the respective lattice ...

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Figure 4: X-ray diffraction patterns (Cu Kα radiation) of Fe nanoparticles embedded in a Cu film on a Ta subs...

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Figure 5: In-plane hysteresis curves of the embedded Fe nanoparticles measured at 10 K in as-prepared state (...

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Figure 6: In-plane hysteresis curves of the embedded Fe nanoparticles after loading of the Ta substrate with ...

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Figure 7: ZFC (circles) and FC (squares) magnetization curves of the Fe nanoparticles embedded in Cu film in ...

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Full Research Paper

Published 01 Jun 2011

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Preparation and characterization of supported magnetic nanoparticles prepared by reverse micelles

Ulf Wiedwald,
Luyang Han,
Johannes Biskupek,
Ute Kaiser and
Paul Ziemann

Beilstein J. Nanotechnol. 2010, 1, 24–47, doi:10.3762/bjnano.1.5

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Scheme 1: Preparation of NPs by a reverse micelle technique. PS-b-P2VP or PS-b-P4VP is dispersed in anhydrous...

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Figure 1: CoCl₂ loaded PS(1779)-b-P2VP(857) reverse micelles deposited at different dip-coating velocities; (...

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Figure 2: Co NPs prepared from CoCl₂-loaded PS(1779)-b-P2VP(857) reverse micelles deposited on a Si AFM-tip b...

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Figure 3: Fe (left column) and Co (right column) NPs prepared from PS(312)-P2VP(71) (upper panels) and PS(177...

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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...

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Figure 5: Photoelectron spectroscopy of Co-precursor loaded PS(1779)-P2VP(857) reverse micelles after differe...

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Figure 6: Pt-4f and Fe-2p XPS spectra of 9.8 nm FePt particles before and after exposure to ambient air for 2...

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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...

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Figure 8: Aberration corrected HRTEM images of FePt particles seen along [100] direction. The L1₀ ordering al...

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Figure 9: Aberration corrected HR-TEM images of about 8 nm FePt NPs in [101] orientation. Crystal defects such as ...

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Figure 10: (a) Schematics of the compensation approach: Temperature dependence of the magnetic susceptibility ...

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Figure 11: (a) DC-demagnetization and isothermal remanent magnetization of 8 nm Co particles measured by SQUID...

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Figure 12: Element-specific magnetic hysteresis loops of 5.8 nm FePt NPs taken at the Fe-L₃ edge at T = 11 K a...

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Figure 13: Coercive field at T = 300 K as function of the diameter of FePt NPs after annealing for 30 min at T...

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Figure 14: Experimental hysteresis loops of 5.8 nm FePt NPs at 11 K and simulations using a bimodal Gaussian K...

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Figure 15: Distributions of the effective anisotropy K_eff for arrays of differently sized NPs used for simulat...

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Figure 16: (a) Coercive fields at T = 11 K and T = 300 K as function of 30 min annealing time at temperature T_A...

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Figure 17: Co-L_3,2 XA and XMCD spectra of 5.6 nm Co₅₆Pt₄₄ NPs after annealing at 700 °C taken at external fiel...

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Figure 18: Element-specific magnetic hysteresis loops of 5.8 nm Co₅₆Pt₄₄ NPs taken at the Co-L₃ edge maximum d...

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Figure 19: SEM images of 8 nm Co-based NP after oxygen plasma (a) and after Au photoseeding of reduced particl...

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Full Research Paper

Published 22 Nov 2010

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