Magnetic And Structural Properties Of Laser-Ablated Planar And Cylindrical Co Thin Films

1999 ◽  
Vol 577 ◽  
Author(s):  
V. Madurga ◽  
J. Vergara ◽  
R. J. Ortega ◽  
I. P. De Landazabal ◽  
C. Favieres
Keyword(s):  
Thin Films ◽  
Kerr Effect ◽  
Annealing Temperature ◽  
Spontaneous Magnetization ◽  
Annealed Sample ◽  
Bistable Behavior ◽  
Scanning Tunnelling ◽  
Magnetostriction Constant ◽  
Tunnelling Microscopy ◽  
Cylindrical Films

ABSTRACTPlanar and cylindrical Co thin films have been obtained by pulsed laser ablation. X-ray diffractograms have shown no crystalline structure for the as-deposited samples, while the 450 °C annealed samples exhibit Co fcc crystalline peaks. The Scanning Tunnelling Microscopy has revealed a small increase of the surface roughness for the annealed films. The Hall effect has been used to determine the value of the spontaneous magnetization, Ms, at room temperature; Ms, = 14 kgauss for the as-deposited sample and Ms, = 17.6 kgauss for the 450 °C annealed sample. From transverse magnetooptic Kerr effect, it has been found that the as-deposited samples exhibit magnetic bistability, with a coercive field, Hc, = 6 0e. The annealed samples also show a bistable behavior until the annealing temperature is 450 °C. Besides, it has been observed an increase of Hc up to = 50 Oe, when the annealing temperature increases. The vibrating sample magnetometry has confirmed these results, showing that the magnetization participating in the magnetooptic effect for these low fields is the total spontaneous magnetization of these samples. Moreover, the cylindrical films exhibit magnetoelastic behavior when they are subjected to angular deformation. It has been found that the saturation magnetostriction constant is negative.

Magnetic and Structural Properties of Laser-Ablated Planar and Cylindrical Co Thin Films

1999 ◽  
Vol 562 ◽  
Author(s):  
V. Madurga ◽  
J. Vergara ◽  
R. J. Ortega ◽  
I. P. de Landazabal ◽  
C. Favieres
Keyword(s):  
Thin Films ◽  
Kerr Effect ◽  
Spontaneous Magnetization ◽  
Annealed Sample ◽  
Saturation Magnetostriction ◽  
X Ray ◽  
Scanning Tunnelling ◽  
Magnetostriction Constant ◽  
Tunnelling Microscopy ◽  
Cylindrical Films

ABSTRACTPlanar and cylindrical Co thin films have been obtained by pulsed laser ablation. X-ray diffractograms have shown no crystalline structure for the as-deposited samples, while the 450 °C annealed samples exhibit Co fcc crystalline peaks. The Scanning Tunnelling Microscopy has revealed a small increase of the surface roughness for the annealed films. The Hall effect has been used to determine the value of the spontaneous magnetization, Ms, at room temperature; Ms ≈ 14 kgauss for the as-deposited sample and Ms ≈ 17.6 kgauss for the 450 °C annealed sample. From transverse magnetooptic Kerr effect, it has been found that the as-deposited samples exhibit magnetic bistability, with a coercive field, Hc, °C. Besides, it has been observed an increase of H, up to ≈ 50 Oe, when the annealing temperature increases. The vibrating sample magnetometry has confirmed these results, showing that the magnetization participating in the magnetooptic effect for these low fields is the total spontaneous magnetization of these samples. Moreover, the cylindrical films exhibit magnetoelastic behavior when they are subjected to angular deformation. It has been found that the saturation magnetostriction constant is negative.

Scanning tunnelling microscopy on the growth and structure of NiO(100) and CoO(100) thin films

1999 ◽  
Vol 114 ◽  
pp. 129-140 ◽  
Author(s):  
Ina Sebastian ◽  
Thomas Bertrams ◽  
Klaus Meinel ◽  
Henning Neddermeyer
Keyword(s):  
Thin Films ◽  
Scanning Tunnelling Microscopy ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy

The Ten-Fold Surface of The Decagonal Al72Ni11Co17 Quasicrystal Studied by Leed, Spa-Leed, Aes and Stm.

2000 ◽  
Vol 643 ◽  
Author(s):  
Erik J. Cox ◽  
Julian Ledieu ◽  
RÓn'n Mcgrath ◽  
Renee D. Diehl ◽  
Cynthia J. Jenks ◽  
...  
Keyword(s):  
Annealing Time ◽  
Electron Spectroscopy ◽  
Annealing Temperature ◽  
Profile Analysis ◽  
Low Energy Electron Diffraction ◽  
Annealing Temperatures ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
Low Energy Electron ◽  
Stm Images

AbstractThe ten-fold surface of the decagonal Al72Ni11Co17 (d-Al-Ni-Co) quasicrystal has been investigated using low energy electron diffraction (LEED), spot profile analysis LEED (SPA- LEED), Auger electron spectroscopy (AES) and scanning tunnelling microscopy (STM). This was done as a function of both annealing temperature and annealing time. The long-range order of the surface, as indicated by LEED, increases both as a function of annealing time and temperature. STM shows the surface to be rough and cluster-like at low annealing temperatures (≤725 K), whilst annealing to temperatures in excess of 725 K results in the formation of terraces. These terraces are small (≤ 100 Å width) at lower annealing temperatures and increase in size (100 Å ≤ x ≤ 500 Å) as the annealing temperature is increased (≥ 850 K). They are characterised by the presence of three-fold protrusions which align preferentially. STM images show single height steps as expected due to the periodicity of d-Al-Ni-Co in the z direction. To date it has not been possible to obtain atomic resolution, although this work is continuing.

scholarly journals Sublimation of Li@C60

2020 ◽  
Vol 74 (6) ◽  
Author(s):  
Eleanor E. B. Campbell ◽  
Henry J. Chandler ◽  
Renald Schaub
Keyword(s):  
Thin Films ◽  
Gas Phase ◽  
Molecular Beams ◽  
Decay Process ◽  
Quartz Ampoule ◽  
Endohedral Fullerenes ◽  
Fundamental Properties ◽  
Treatment Conditions ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy

Abstract Experiments that probe the fundamental properties of endohedral fullerenes often require the preparation of molecular beams or thin films of the neutral molecules. It is challenging to cleanly sublime this class of molecules without producing some thermal degradation. We report combined gas phase and scanning tunnelling microscopy studies that probe the thermal decay of commercial [Li+C60]PF6- in a quartz ampoule and provide treatment conditions that will allow the sublimation of intact, neutral Li@C60 accompanied by a well-characterised component of neutral C60. The decay of the material at appropriate temperatures can be modelled with the assumption of a second order decay process in the oven yielding Arrhenius parameters that can predict the ratio of Li@C60 to C60 in the sublimed material. Graphical abstract

Growth and structure of YBa2Cu3O7−δ thin films studied by scanning tunnelling microscopy and electron microscopy

1993 ◽  
Vol 228 (1-2) ◽  
pp. 173-177 ◽  
Author(s):  
H. Haefke ◽  
H.P. Lang ◽  
R. Sum ◽  
H.-J. Güntherodt ◽  
L. Berthold ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Tunnelling Microscopy ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy
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