Regensburg 2007 – scientific programme

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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 15.141: Poster

Tuesday, March 27, 2007, 15:00–19:00, Poster A

Magnetic anisotropy of Fe_1−xCo_x(110) on GaAs(110) — •Björn Muermann, Matthias Sperl, Alexander Spitzer, and Günther Bayreuther — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Regensburg, Germany

In this contribution we investigate the magnetic anisotropy of epitaxial Fe_1−xCo_x(110) films (x=0 ...0,64) grown by molecular beam epitaxy (MBE) on GaAs(110). The samples were grown on clean wafer as well as on surfaces prepared by cleaving in ultra high vacuum and studied by means of alternating gradient magnetometry (AGM) and ferromagnetic resonance (FMR) spectroscopy. The angular dependent energy density observed can be explained by two main contributions to the magnetic anisotropy: an effective magnetocrystalline anisotropy K_cryst^eff(t) caused by the symmetry of the Fe_1−xCo_x(110) lattice, and an effective uniaxial anisotropy, K_U^eff(t). The strength of these anisotropies is thickness dependent due to a volume and a surface contribution, K_i^eff(t) = K_i^Vol+K_i^Surf/t. Néel’s pair energy model is used to derive the relation between the surface and volume term of the crystalline anisotropy. The strain induced uniaxial anisotropy is altered by different compositions of iron and cobalt. The effects of interface roughness and structural defects to the anisotropy are discussed.