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.

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.

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

scholarly journals An Incommensurate Reconstruction Studied with Scanning Tunnelling Microscopy and Surface X-Ray Diffraction

1997 ◽  
Vol 8 (3) ◽  
pp. 167-174 ◽  
Author(s):  
Bernard Aufray ◽  
Mats Göthelid ◽  
Jean-Marc Gay ◽  
Christine Mottet ◽  
Erik Landemark ◽  
...  
Keyword(s):  
Scanning Tunnelling Microscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy

scholarly journals Intercalation of solvated Na-ions into graphite

2017 ◽  
Vol 10 (7) ◽  
pp. 1631-1642 ◽  
Author(s):  
L. Seidl ◽  
N. Bucher ◽  
E. Chu ◽  
S. Hartung ◽  
S. Martens ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Electrochemical Quartz Crystal Microbalance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Graphite Intercalation ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
Na Ions ◽  
In Operando

The reversible intercalation of solvated Na-ions into graphite and the concomitant formation of ternary Na–graphite intercalation compounds (GICs) are studied using several in operando techniques, such as X-ray-diffraction (XRD), electrochemical scanning tunnelling microscopy (EC-STM) and the electrochemical quartz crystal microbalance technique (EQCM).

Calibration of standards for precision pitch measurement in the nanometre region by combined scanning tunnelling microscopy and x-ray interferometry

1999 ◽  
Vol 10 (4) ◽  
pp. 412-417 ◽  
Author(s):  
Wang Lin ◽  
Ulrich Kuetgens ◽  
Peter Becker ◽  
Ludger Koenders ◽  
Li Dacheng ◽  
...  
Keyword(s):  
Scanning Tunnelling Microscopy ◽  
X Ray ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy

Article

1998 ◽  
Vol 76 (11) ◽  
pp. 1559-1563
Author(s):  
J Hugh Horton ◽  
Johann Rasmusson ◽  
Joseph G Shapter ◽  
Peter R Norton
Keyword(s):  
Chemical Vapour Deposition ◽  
Photoelectron Spectroscopy ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Organometallic Compounds ◽  
Vapour Phase ◽  
Scanning Tunnelling Microscopy ◽  
X Ray ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy

The adsorption of the organometallic compounds bis(hexafluoroacetylacetonato)zinc(II) (Zn(hfac)2) and bis(hexafluoroacetylacetonato)nickel(II) (Ni(hfac)2) on the surface of Si(111)-7×7 were studied by a combination of scanning tunnelling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). These compounds are analogues of the compound bis(hexafluoroacetylacetonato)copper(II), which is an important precursor for the chemical vapour deposition of copper that we have previously studied. Both XPS and STM results indicate that the Zn(hfac)2 is adsorbed intact on the surface, and remains intact on the surface at temperatures up to 300 K. The XPS shows a transition from a physisorbed state to a chemisorbed state at temperatures between 160 and 300 K. At higher temperatures Zn(hfac)2 decomposed to form Zn and fluorocarbon fragments. The metal component diffused into the substrate. The Ni(hfac)2 complex could not be successfully adsorbed on the Si surface: it was shown that this was due to decomposition of the molecule in the vapour phase, probably due to the higher temperatures needed to evaporate this relatively involatile compound.Key words: scanning tunnelling microscopy, chemical vapour deposition, zinc, copper.

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