AVS 45th International Symposium
    Magnetic Interfaces and Nanostructures Technical Group Thursday Sessions
       Session MI-ThA

Invited Paper MI-ThA5
Epitaxial Fe and Co Layers on Cu Crystals

Thursday, November 5, 1998, 3:20 pm, Room 324/325

Session: Structure & Magnetism of Surfaces & Interfaces
Presenter: J. Kirschner, Max-Planck-Institut für Mikrostrukturphysik, Germany
Correspondent: Click to Email
Fe and Co exhibit a multitude of structural and magnetic phases when deposited on to high-index planes of fccCu. Much work has been done on films made by thermal deposition or sputter deposition. We added pulsed laser deposition (PLD) in UHV and chemical deposition, and studied similarities and dissimilarities. Most striking effects are observed for pulsed laser deposition, which may alter the growth mode (from 3D growth for thermal deposition (TD) to layer-by-layer growth for PLD), magnetic anisotropies (from perpendicular (TD) to in-plane (PLD) for Fe/Cu(100), and magnetic moments (from low-spin (TD) to high-spin (PLD) for Fe/Cu(111). Co deposited electrochemically on to Cu(100) grows pseudomorphically up to 5 monolayers and non-pseudomorphically beyond. This has been found by in-situ surface x-ray diffraction. Effects of reduced dimensionality ocurr at surfaces and at steps. In the former case an oscillatory behaviour of the surface magnetization with one monolayer period has been observed by magneto-optical second harmonic generation. Magnetic nano-wires may be created by step edge decoration on stepped Cu(111). These resemble one-dimensional Ising chains (which has no net magnetization at thermal equilibrium), but show magnetic hysteresis at low temperature.