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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 13.19: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1A

Metamagnetic domains in [Co/Pt]/Ru multilayers — •N. S. Kiselev^1,2, C. Bran¹, U. Wolff¹, L. Schultz¹, A.N. Bogdanov¹, O. Hellwig³, V. Neu¹, and U. K. Rößler¹ — ¹IFW Dresden — ²Donetsk Inst. for Physics & Technology — ³Hitachi GST, San Jose

In antiferromagnetically coupled superlattices with perpendicular anisotropy, a magnetic field induces a cascade of reorientation transitions accompanied by metamagnetic multidomain states [1,2]. For a micromagnetic model, we derive equilibrium sizes of stripe and bubble metamagnetic domains as functions of the antiferromagnetic exchange, magnetic field, and geometrical parameters of the multilayers. Magnetic phase diagrams display three different types of metamagnetic domains which separate the ferrimagnetic state from the antiferromagnetic and the saturated ferromagnetic state, and from ferrostripe phases. Experimental investigations have been carried out for an antiferromagnetically coupled [(Co/Pt)₈Co/Ru]₁₈ superlattice. Magnetic force microscopy (MFM) imaging in a magnetic fields reveals peculiarities of the nucleation and evolution of metamagnetic domains. Theoretical analysis of MFM data and the magnetization curves gives a consistent description of the magnetization processes in [Co/Pt]/Ru multilayers. Demagnetization processes starting from the multidomain metamagnetic states lead to specific remanents states, namely metamagnetic band and bubble topological defects[2].

[1] O. Hellwig, A. Berger, J. B. Kortright, E. E. Fullerton, J. Magn. Magn. Mater. 319 13 (2007). [2] N.S. Kiselev, U. K. Rößler, A. N. Bogdanov, O. Hellwig, Appl. Phys. Lett. 93 132507 (2008).