Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.116: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Magnetic Texture of polycrystalline Co-films after ion-implantation — •K. Zhang1, G.A. Müller1, R. Gupta1, Y. Luo2, and K.-P. Lieb1 — 1II. Physikalisches Institut, Universität Göttingen, Bunsenstrasse 7/9, D-37073 Göttingen, Germany — 2I. Physikalisches Institut, Universität Göttingen, Bunsenstrasse 9, D-37073 Göttingen, Germany
The magnetic properties in thin ferromagnetic films are determined by
inherent magnetocrystalline anisotropy, which can be changed by using
ion-implantation inducing high local energy deposition and defect
formation [1-3] as well as phase transformations. We present experimental
results, which show the dramatic change of the magnetic anisotropy in 75
nm polycrystalline Co films deposited on amorphous SiO2 substrates and
irradiated with 200 keV Xe-ions at room temperature. Magnetic properties
were characterized by using VSM and MOKE. At fluence up to 4 x 1014
ions/cm2, the magnetization showed two-fold anisotropy, while for
higher fluence a coupling of two-fold and four-fold anisotropy was found.
Changes of the crystal structure were monitored with X-ray diffraction.
[1] M. Neubauer, et al., Nucl. Instr. Meth. B 139 (1998) 332.
[2] K. Zhang, et al., Nucl. Instr. Meth. B 161-163 (2000) 1016 .
[3] K. P. Lieb, et. al., Acta Phys. Polon. A 100 (2001) 751.