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 15.77: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Nanoscale surface ripples on ferromagnetic films with correlated magnetic — Kun Zhang1, Frank Rotter1, Michael Uhrmacher1, Carsten Ronning1, Hans Christian Hofsäss1, Johann Krauser2, and •Klaus Jesiek1 — 1II.Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Fachbereich Automatisierung und Informatik, Hochschule Harz, Friedrichstrasse 57-59, 38855 Werningerode, Germany
The correlation between nanoscale surface ripple patterns and the magnetic texture of polycrystalline iron and nickel thin films was investigated. The ripple patterns were created by ion beam sputter erosion of films evaporated on Si substrates with 5 keV Xe ions under grazing incidence and fluences between 1015 and 1017 cm−2. The as-deposited films with an rms roughness of about 1 nm are magnetically isotropic. MOKE measurements reveal a pronounced uniaxial magnetic anisotropy of the only 1-2 nm thin irradiated surface region of the films with an orientation parallel to the ripple orientation and also to the ion beam direction. Sputter erosion reduced the coercive field of the films for all erosion conditions investigated. Sputter erosion at an incidence angle of 80∘ with respect to the surface normal produces rather smooth films and for ion-fluences exceeding 1016 cm−2 formation of ripples parallel to the ion beam direction with wavelength between 30 nm and 80 nm is observed. Almost complete sputter erosion of Fe films resulted in the formation of Fe nanorods oriented parallel to the ion beam direction with 100% uniaxial magnetic texture.