Dresden 2006 – scientific programme
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MA: Magnetismus
MA 7: Micro- and Nanostructured Magnetic Materials I
MA 7.3: Talk
Monday, March 27, 2006, 15:30–15:45, HSZ 03
Control of magnetic anisotropy and magnetic patterning of perpendicular Co/Pt multilayer films by laser irradiation — •I. Guhr1, C. Schuppler1, A. Habenicht1, M. Maret2, P. Leiderer1, J. Boneberg1, and M. Albrecht1 — 1University of Konstanz, Department of Physics, 78457 Konstanz, Germany — 2Laboratoire de Thermodynamique et Physico-Chimie Métallurgiques, 38402 Saint Martin d’Heres, France
We report an approach to altering the magnetic properties of (111) textured Co/Pt multilayer films grown on sapphire (0001) substrates in a controlled way using a single laser pulse (λ = 532 nm) at fixed FWHM of about 10 ns.The as-grown films reveal a strong perpendicular magnetic anisotropy induced by interfacial anisotropy. We show that laser irradiation can chemically mix the multilayer structure, leading to a reduction of the perpendicular magnetic anisotropy and coercivity and a rise in the saturation magnetization depending on the laser fluence as confirmed by XRD and SQUID magnetometry investigations.
As a result, the films can also be patterned into hard and soft magnetic regions using a regular 2D lattice of polystyrene particles acting as an array of microlenses. Regularly spaced submicrometer-sized regions of magnetically altered material have been produced over areas of a square millimeter. In this way, magnetic patterning with periods smaller than the wavelength can be achieved.
This project is funded by the DFG through SFB 513 and the Emmy-Noether program at the University of Konstanz.
[1] C. Schuppler et al., Appl. Phys. Lett. (2005) accepted for pub.