Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.26: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
10keV He ion bombardment of Ni80Fe20/Au/Co/Au multilayers with alternating in-plane and out-of-plane magnetization — •Tanja Weis1, Dieter Engel1, Arno Ehresmann1, Maria Tekielak2, Andrzej Maziewski2, Bogdan Szymanski3, Janusz Dubowik3, and Feliks Stobiecki3 — 1Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany — 2Institute of Molecular Physics, Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznan, Poland — 3Institute of Experimental Physics, University of Bialystok, Lipowa 41, 15-424 Poland
Ion bombardment with light ions enables the alteration of the magnetic properties in magnetic thin film systems [1]. This technique was used to modify magnetic anisotropies in Ni80Fe20/Au/Co/Au multilayers. The as-prepared multilayers show prior to bombardment alternating in-plane (NiFe) and out-of-plane (Co) magnetization. We will present Kerr Microscopy images of 10keV He ion bombarded samples with either Au- or Co-wedges to show the dependence of the modifications of magnetic properties like anisotropy and interlayer coupling on the Au- and Co- thickness (tAu and tCo) and on the ion dose. Due to an increase of interface roughness the surface induced perpendicular anisotropy is reduced for 0.95nm ≤ tCo ≤ 1.05nm. On the other hand the ion bombardment heavily mixes ultrathin Co layers (0.35nm ≤ tCo ≤ nm) resulting in their superparamagnetic behavior.
[1] A. Ehresmann et al., Phys. Stat. Sol (b), 243, 29-36 (2006)
[2] F. Stobiecki et al., J. Magn. Magn. Mater., in press