Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 45: Magnetic Coupling and Spin Structures

MA 45.4: Talk

Thursday, March 14, 2013, 15:45–16:00, H10

Exchange Bias effect in coupled systems of ferrimagnetic Fe_100−x−yCo_xTb_y and ferromagnetic [Co(0.4nm)/Pt(0.8nm)]₁₀-multilayers — •Birgit Hebler¹, Christian Schubert¹, Florin Radu², and Manfred Albrecht¹ — ¹Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany — ²Hemholtz-Zentrum Berlin für Materialen und Energie, D-12489 Berlin, Germany

A large exchange bias effect is an important aspect in the miniaturizing of prospective spintronic devices. In this regard out-of-plane anisotropy heterostructures consisting of amorphous ferrimagnetic (FI) rare-earth/transition metal alloys and ferromagnetic (FM)[Co/Pt]-multilayer stacks attracted much attention due to the occurrence of a large exchange bias field of about 10 kOe [1]. In our study we prepared FI/FM bilayers of Fe_100−x−yCo_xTb_y (20nm) and a Co(0.4nm)/Pt(0.8nm)]₁₀-multilayer stack by magnetron-sputtering in a UHV-chamber at room temperature. We measured the magnetization reversal processes at different temperatures by using a SQUID-VSM to analyze how the variation of the composition of the ternary alloy influences the magnetic exchange interactions at the interface and consequently the exchange bias field.

[1] S. Romer et al., Appl. Phys. Lett. 101, 222404 (2012)