Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.20: Poster

Tuesday, March 24, 2009, 10:15–13:00, P1A

Micromagnetic analysis of magnetic nanosystems with competing anisotropies — •Andrei A. Leonov^1,2, Ulrich K. Rößler¹, and Alexei N. Bogdanov¹ — ¹IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — ²Donetsk Institute for Physics and Technology, 83114 Donetsk, Ukraine

The interplay between cubic and uniaxial magnetic anisotropies strongly influences magnetization processes in such novel classes of nanomagnetic systems as ferromagnet-antiferromagnet bilayers, thin epilayers of diluted magnetic semiconductors, Heusler alloys, magnetic nanowires or nanoparticles.We have extended and generalized a micromagnetic model to describe magnetization processes in systems with competing magnetic anisotropies and adopted them to investigate nanomagnetic systems (see [1] and bibliography in [1]). In this contribution we apply the results of [1] for detailed analysis of recent experimental results: (i) remarkable transformation of metastable magnetic states, reorientation effects, and magnetization reversal observed in Fe-Cu-B nanoparticles [2], in (Ga,Mn)As epilayers [3], and in magnetite [4] films. (ii) magnetic-field-driven evolution of magnetic domain walls in nanoconstrictions [5]. (iii) calculation of the parameters for multidomain patterns in (Ga,Mn)As films with perpendicular anisotropy [1].

[1] A.A.Leonov et al. J. Appl. Phys. 104, 084304 (2008). [2] N. Duxin et al., Langmuir 16, 11 (2000). [3] K.Pappert et al., Appl. Phys. Lett. 90, 062109 (2007). [4] A. Brandlmaier et al., Phys. Rev. B 77, 104445 (2008). [5] M. Yamanouchi et al., Nature (London) 428, 539 (2004).