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Materials Surface Processing Spied by Hyperfine Interactions

100%

Schaaf P., Weisheit M., Krebs H.

Acta Physica Polonica A

2001

vol. 100

issue 5

699-706

There are many aspects of materials surface processing ranging from simple heat treatments to ion implantation or laser surface treatments, e.g. the laser-plasma-coating formation in nitrogen gas, which is called laser nitriding. These methods are often very complicated, involving many basic processes and they have to be optimised for the desired application. Nuclear methods can be successfully applied for this task. First, Ag/Fe multilayers can be prepared by pulsed laser deposition employing an excimer laser. The Ag/Fe system is immiscible and sharp interfaces are expected for that reason. Nevertheless, it will be presented that some intermixing occurs which can be seen by conversion electron Mössbauer spectroscopy with the additional trick of preparing a sensitive ^{57}Fe layer at various distances from the interfaces. Several Ag neighbours to the Fe spy-atom can be resolved, whose abundances vary with the location of the ^{57}Fe marker layer. It is found that the intermixing at the bottom and top interface of the Fe layers is asymmetric.

The Influence of the Defect Structure on the Nitriding of Fe by PIII

88%

De Baerdemaeker J., Jirásková Y., Schaaf P., Segers D., Dauwe C.

Acta Physica Polonica A

2005

vol. 107

issue 5

817-820

Plasma ion immersion implantation is a promising technique for nitriding. A case study of the characterization of the plasma ion immersion implantation nitriding of iron alloys is the plasma ion immersion implantation nitriding of pure Fe. A set of Fe samples of 99.98% purity and with different defect structure was plasma ion immersion implantation nitrided at different temperatures. Depth profiling of the samples was achieved using positron annihilation spectroscopy with a slow positron beam and nanoindentation. A correspondence was found between the line shape parameter S and the hardness of the plasma ion immersion implantation treated samples.

Magnetic Textures in Thin Ion-Irradiated Ni and Fe Films

76%

Lieb K., Zhang K., Müller G., Schaaf P., Uhrmacher M., Felsch W., Münzenberg M.

Acta Physica Polonica A

2001

vol. 100

issue 5

751-760

Heavy-ion bombardment of thin ferromagnetic, polycrystalline films can induce substantial changes of their magnetic and microstructural properties. Since we first identified this effect in 50-150 nm thick Fe and Ni films irradiated with Xe-ions, we made a systematic search for the influence of various film and implantation parameters on the orientation and degree of the magnetic anisotropy and how these parameters correlate with the microstructure of the films. Several analyzing methods, such as Rutherford backscattering, magneto-optical Kerr effect, X-ray diffraction, magnetic force microscopy, ^{111}In perturbed angular correlation, and conversion electron Mössbauer spectroscopy, were employed in the investigation.

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3 Acta Physica Polonica A

1 2005

2 2001

3 Schaaf P.

1 Dauwe C.

1 De Baerdemaeker J.

1 Felsch W.

1 Jirásková Y.

1 Krebs H.

1 Lieb K.

1 Müller G.

1 Münzenberg M.

1 Segers D.

1 Uhrmacher M.

1 Weisheit M.

1 Zhang K.

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Materials Surface Processing Spied by Hyperfine Interactions

The Influence of the Defect Structure on the Nitriding of Fe by PIII

Magnetic Textures in Thin Ion-Irradiated Ni and Fe Films