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Dresden 2003 – scientific programme

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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

Tuesday, March 25, 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. Lieb11II. 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.

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