Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 54: Magnetic Coupling Phenomena
MA 54.1: Talk
Friday, March 20, 2015, 09:30–09:45, EB 301
Role of antiferromagnetic spin configuration in dual exchange biased structure in [Pt/Co]6/CoO/[Co/Pd]8 system — •Sri Sai Phani Kanth Arekapudi1, Dmitriy Mitin2, and Manfred Albrecht2 — 1Institut für Physik, Technische Universität Chemnitz, D-09107 Chemnitz, Germany — 2Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany
The exchange bias effect and magnetic reversal processes in the dual exchange bias structure, [Pt/Co]6/CoO/[Co/Pd]8 trilayer with an easy axis magnetization out-of-plane were studied. The individual reversal of the ferromagnetic multilayers was achieved by fine-tuning the switching field, and the exchange coupling was studied by observing the independent magnetic reversal processes, which was explicitly contemplated via minor loops. This allows us to set the trilayer system in two different magnetic cooling configurations. Where the net magnetic moment in the ferromagnetic layers were aligned either parallel or antiparallel to each other. After field cooling the samples from room temperature to below the blocking temperature of the antiferromagnet, we were able to probe the exchange interaction between two biased systems through a common antiferromagnetic interface. The dependence of exchange bias field on the thickness of the antiferromagnetic spacer (CoO) layer as well as the measurement temperature were systematically analyzed. Furthermore, the exchange bias field tends to decrease with increase in the thickness of the antiferromagnet and can be attributed to modification of the bulk spin structure and the domain walls of the AF layer ultimately influencing the exchange bias field.