Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.14: Poster

Friday, March 27, 2009, 11:00–14:00, P1A

Study of interfacial spin glass layer in exchange coupled Ni₈₀Fe₂₀/Ir₁₉Mn₈₁ bilayers — •S. K. Mishra, F. Radu, H. A. Dürr, and W. Eberhardt — Albert-Einstein Str. 15, D-12489, Berlin, Germany

We report on an experimental study of the angular and antiferromagnet thickness dependence of exchange coupling in the Ni₈₀Fe₂₀/Ir₁₉Mn₈₁ polycrystalline bilayers. The longitudinal component of the magnetization yields a very rich phenomenology at critical thickness of antiferromagnet. The experimental study suggests a non monotonic behavior for both exchange bias and coercivity fields as the function of antiferromagnetic layer thickness. These results are discussed within the framework of the spin glass model of the exchange bias. Simulations of the magnetic hysteresis loops suggest a variation of the antiferromagnetic anisotropy and of the other interfacial exchange coupling parameters across the critical thickness of the antiferromagnet layer.