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We report on a comprehensive study of the magnetic coupling between softmagnetic Fe layers and hard magnetic Dysprosium (Dy) layers at low temperatures(4.2 - 120K). For our experiments we prepared thin films of Fe and Dy andmultilayers of Fe/Dy by ultra-high vacuum sputtering. The magnetic propertiesof each material were determined with a superconducting quantum interferencedevice. Furthermore, we performed magnetoresistance measurements with similarlygrown, microstructured devices, where the anisotropic magnetoresistance (AMR)effect was used to identify the magnetization state of the samples. Byanalyzing and comparing the corresponding data of Fe and Dy, we show that thepresence of a Dy layer on top of the Fe layer significantly influences itsmagnetic properties and makes it magnetically harder. We perform a systematicevaluation of this effect and its dependence on temperature and on thethickness of the soft magnetic layer. All experimental results can consistentlybe explained with exchange coupling at the interface between the Fe and the Dylayer. Our experiments also yield a negative sign of the AMR effect of thin Dyfilms, and an increase of the Dy films' Curie temperature, which is due togrowth conditions.

Engineering and improving the magnetic properties of thin Fe layers through exchange coupling with hard magnetic Dysprosium layers