Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 43: Magnetization Dynamics III

MA 43.4: Vortrag

Donnerstag, 3. April 2014, 15:45–16:00, HSZ 401

Spin wave mediated synchronization of localized modes in spin torque nano-oscillators — •Thomas Kendziorczyk and Tilmann Kuhn — Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

Spin torque nano-oscillators (STNOs) are promising candidates for tunable nanoscale microwave sources for applications in chip-to-chip and wireless communications. In 2005 it has been demonstrated experimentally [1], that two STNOs can be synchronized, which can greatly increase their output power. The synchronization of the STNO pair was realized by mutual interaction through propagating spin waves. However this experiment has been performed for an out-of-plane magnetized magnetic film, which requires impractical high external magnetic fields. In this contribution we will show by means of micromagnetic modeling how to achieve long-range synchronization between STNOs which are placed on an in-plane magnetized magnetic film. While requiring much lower external fields, usually the excited modes for STNOs in this geometry are self-localized. However, it is possible through the local modification of the internal field to increase the frequency of the STNO above the FMR of the surrounding film, which promotes emission of spin waves [2]. We predict, that two such localized modes which are coupled by spin waves in the surrounding material can be used for a long-range synchronization through the emission of directional spin waves.

1. S. Kaka et al., Nature 437, 389 (2005)

2. H. Ulrichs et al., Appl. Phys. Lett. 100,16 (2012)