Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.10: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Pulsed laser deposition of thin film Heusler compounds — •Mirko Emmel, Christian Mix, and Gerhard Jakob — Institut für Physik, Johannes Gutenberg-Universität Mainz, Deutschland

Pulsed laser deposition (PLD) is a versatile technique to deposit thin films of one or more targets illuminated by a focused pulsed-laser beam. Since the energy source is located outside the chamber, the use of ultra-high vacuum is possible. Due to a stoichiometric transfer between target and substrate, PLD allows depositing all kinds of multicomponent materials. We optimized the optical elements, which resulted in higher transmission of the laser energy and a more defined laser spot on the target. At a base pressure of about 10⁻⁹ mbar we successfully deposited thin films of different Heusler compounds. A further advantage of a PLD system is the capability to use relatively small targets, which are not suitable for other deposition methods like sputtering. The minimum diameter of a PLD-target is defined by the spot size of the laser on the target in order to avoid ablating other material. Hysteresis loops of Co₂FeSi and Rh₂MnGe thin film showed the expected magnetic saturation values. Ellipsometry measurements of Co₂FeSi thin films were performed to determine the permittivity. This work is supported by the DFG research group ASPIMATT and the Stiftung Rheinland-Pfalz für Innovation.