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  1. No Access

    Article

    Argon and krypton ion-induced changes in permalloy thin films

    The effects of 75-keV Ar and 100-keV Kr ion irradiations of 72-nm thin DC-sputtered permalloy (Ni81Fe19) films on Si(100) wafers were studied at fluences of up to 1016 ions/cm2. The changes of the structural and ...

    R. Gupta, K. P. Lieb, Y. Luo, G. A. Müller, P. Schaaf… in The European Physical Journal B (2008)

  2. Article

    Open Access

    Microstructure of TiN coatings synthesized by direct pulsed Nd:YAG laser nitriding of titanium: Development of grain size, microstrain, and grain orientation

    Pure titanium was irradiated by pulsed Nd:YAG laser irradiation in nitrogen atmosphere. As a result, nitrogen uptake and diffusion occurred and a TiN layer was synthesized at the titanium surface. These TiN co...

    D. Höche, H. Schikora, H. Zutz, R. Queitsch, A. Emmel, P. Schaaf in Applied Physics A (2008)

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  3. No Access

    Article

    The influence of rf plasma time on the carbonitriding treatment of titanium

    Inductively coupled radio frequency plasma surface treatment was applied to commercially pure titanium sheets. The goal was to increase the efficiency of the carbonitriding process, i.e., to decrease the plasm...

    M. Raaif, F.M. El-Hossary, N.Z. Negm, S.M. Khalil, P. Schaaf in Applied Physics A (2007)

  4. No Access

    Article

    Ion-beam induced changes in magnetic and microstructural properties of thin iron films

    Changes in magnetic and structural properties of 60–82 nm iron films induced by heavy-ion implantation were studied using the magneto-optical Kerr effect, Mössbauer spectroscopy, Rutherford backscattering sp...

    G. A. Müller, E. Carpene, R. Gupta… in The European Physical Journal B - Condense… (2005)

  5. No Access

    Article

    Synthesis of highly oriented TiNx coatings by free-electron laser processing of titanium in nitrogen gas

    Titanium substrates were irradiated in pure nitrogen gas by means of a free-electron laser. The treatment resulted in the formation of δ-TiNx coatings, with surface stoichiometry x≈1 and thickness of about 15 μm....

    E. Carpene, M. Shinn, P. Schaaf in Applied Physics A (2005)

  6. No Access

    Article

    Xenon-ion Induced Magnetic and Structural Modifications of Ferromagnetic Alloys

    Thin polycrystalline films of permalloy (Ni79Fe21) and permendur (Co50Fe50) have been irradiated with Xe-ions to fluences of 1014–1016 ions/cm2. Ion-induced structural and magnetic modifications have been measure...

    Ratnesh Gupta, K. P. Lieb, G. A. Müller, P. Schaaf, K. Zhang in Hyperfine Interactions (2005)

  7. No Access

    Article

    Heavy Ion Irradiated Ferromagnetic Films: The Cases of Cobalt and Iron

    Polycrystalline, e-gun deposited Co, Fe and Co/Fe films, tens of nanometers thick, have been irradiated with Ne, Kr, Xe and/or Fe ions to fluences of up to 5 × 1016 ions/cm2. Changes in the magnetic texture induc...

    K. P. Lieb, K. Zhang, G. A. MÜller, R. Gupta, P. Schaaf in Hyperfine Interactions (2005)

  8. No Access

    Article

    Nitrogen irradiation of Fe/Si bilayers: nitride versus silicide phase formation

    In the course of a systematic investigation of heavy ion-irradiated Fe/Si layers, we have studied atomic transport and phase formation induced by 22-keV 14N2+ ion implantation in 57Fe(30 nm)/Si bilayers at high f...

    V. Milinovic, N. Bibic, S. Dhar, M. Siljegovic, P. Schaaf, K.P. Lieb in Applied Physics A (2004)

  9. No Access

    Article

    Magnetic Texturing of Xenon-Irradiated Iron Films Studied by Magnetic Orientation Mössbauer Spectroscopy

    Modifications of magnetic properties upon heavy-ion irradiation have been recently investigated for films of ferromagnetic 3d-elements (Fe, Ni, Co) and alloys (permendur, permalloy), in relation to changes of ...

    G. A. MÜller, K. P. Lieb, E. Carpene, K. Zhang, P. Schaaf… in Hyperfine Interactions (2004)

  10. No Access

    Article

    Magnetic texturing of xenon-ion irradiated nickel films

    Thin polycrystalline Ni films of typically 75 nm thickness evaporated on Si or SiO2 substrates were irradiated with 30-900 keV Xe-ions to fluences of 2.5 x 1013 - 4 x 1014/cm2. The magnetization of the Ni films w...

    K. Zhang, K. P. Lieb, G. A. Müller… in The European Physical Journal B - Condense… (2004)

  11. No Access

    Article

    Variation of the mechanical properties of pulsed laser deposited PMMA films during annealing

    The structural and mechanical properties of polymethyl methacrylate (PMMA) thin films produced by pulsed laser deposition in ultra-high vacuum were investigated by infrared spectroscopy, electron microscopy, s...

    E. Süske, T. Scharf, P. Schaaf, E. Panchenko, D. Nelke, M. Buback… in Applied Physics A (2004)

  12. No Access

    Article

    MOMS and PAC studies of ion-irradiated ferromagnetic films

    Thin polycrystalline films of Ni, Fe and Co, tens of nanometers thick, have been irradiated with Ar, Kr, Xe and/or Au ions to fluences of 1013 to 1016 ions/cm2. The magnetic texture induced or modified by the imp...

    G. A. Müller, A. Kulińska, Kun Zhang, R. Gupta, P. Schaaf… in Hyperfine Interactions (2003)

  13. No Access

    Article

    Laser hydriding of crystalline and amorphous silicon

    Crystalline and ion-beam-amorphized silicon samples were irradiated with a pulsed nanosecond excimer laser in a pure hydrogen atmosphere. The hydrogen concentration was determined via the 1H(15N,αγ)12C nuclear re...

    M. Schwickert, E. Carpene, M. Uhrmacher, P. Schaaf, K.P. Lieb in Applied Physics A (2003)

  14. No Access

    Article

    Ion-beam mixing in Fe/Si bilayers by singly and highly charged ions: evolution of phases, spike mechanism and possible effects of the ion-charge state

    Silicide formation and ion beam mixing of Fe/Si bilayers due to Ar-, Xe- and Au-ion irradiations at room and liquid-nitrogen temperatures were investigated. For the study of silicide phase formation, the Fe/Si...

    S. Dhar, P. Schaaf, N. Bibić, E. Hooker, M. Milosavljević, K.P. Lieb in Applied Physics A (2003)

  15. No Access

    Chapter

    Cems Studies of Laser Treated Disordered Amorphous and Nanocrystalline Alloys

    Conversion electrons provide information from a depth of about 150 nm for most iron rich alloys. Thus, surface effects can be effectively studied by means of Conversion Electron Mössbauer Spectroscopy (CEMS). ...

    M. Miglierini, K. Sedlačková, E. Carpene… in Material Research in Atomic Scale by Mössb… (2003)

  16. No Access

    Chapter

    Mössbauer Investigation of Surface Processing by Pulsed Laser Irradiation in Reactive Atmospheres

    Irradiations of iron (Armco, Fe > 99.85%) substrates in controlled gaseous atmospheres (nitrogen and methane) have been performed with nanosecond pulses of an excimer laser, leading to the formation of nitride...

    E. Carpene, M. Kahle, M. Han, P. Schaaf in Material Research in Atomic Scale by Mössb… (2003)

  17. No Access

    Chapter

    Moms — Magnetic Orientation Mössbauer Spectroscopy: Determination of Spin Orientations in Ion Irradiated Iron Films

    Here, a xenon-ion induced magnetic texturing of iron films using depth-sensitive and angle-dependent Conversion Electron Mössbauer Spectroscopy as Magnetic Orientation Mössbauer Spectroscopy (MOMS) in combinat...

    P. Schaaf, A. Müller, E. Carpene in Material Research in Atomic Scale by Mössb… (2003)

  18. No Access

    Chapter

    Mössbauer and Atomic Force Microscopy Observations of Modified Surfaces of Fe-Si Steel

    Detailed surface structure investigations by microscopic methods and microhardness measurements of modified Fe-6at.%Si steel samples are presented here. It is found that a preceding mechanical and heat treatme...

    Y. Jirásková, O. Schneeweiss, C. Blawert… in Material Research in Atomic Scale by Mössb… (2003)

  19. No Access

    Article

    Mössbauer Optimization of the Direct Synthesis of β-FeSi2 by Ion Beam Mixing of Fe/Si Bilayers

    At present, there is an increasing interest in the iron di-silicide phase β-FeSi2, which is supposed to be a direct band gap semiconductor and one of the most promising materials for silicon-based optoelectronics...

    P. Schaaf, M. Milosavljevic, S. Dhar, N. Bibic, K.-P. Lieb… in Hyperfine Interactions (2002)

  20. No Access

    Article

    Direct synthesis of β-FeSi2 by ion beam mixing of Fe/Si bilayers

    The iron di-silicide β-FeSi2 is a promising direct band gap semiconductor but difficult to produce. Here, the successful direct synthesis of this phase by ion beam mixing of Fe/Si bilayers at temperatures in the ...

    M. Milosavljevic, S. Dhar, P. Schaaf, N. Bibic, M. Han, K.-P. Lieb in Applied Physics A (2000)

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