Abstract
We report structural and magnetic properties of multilayers composed of thin layers of the half metallic ferromagnetic Heusler compound Co 2MnGe and layers of Au, Cr and the Heusler compound Cu 2MnAl. The hysteresis loops measured at low temperatures reveal the existence of an exchange bias field H eb in all of these multilayers. For the [Co 2MnGe/Au] n multilayer system H eb is largest reaching up to 1 kOe at a temperature of 2 K. We characterize the exchange bias phenomenon in detail and show that it originates from a spin glass type of magnetic order for a thin interlayer at the interfaces. We discuss the results in the light of different models proposed for the explanation of the exchange bias effect.
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