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Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons126843

Seiro,  S.
Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126614

Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Chikina, A., Höppner, M., Seiro, S., Kummer, K., Danzenbächer, S., Patil, S., et al. (2014). Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments. Nature Communications, 5: 3171, pp. 1-6. doi:10.1038/ncomms4171.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-2C69-7
Abstract
Carrying a large, pure spin magnetic moment of 7 mu B per atom in the half-filled 4f shell, divalent europium is an outstanding element for assembling novel magnetic devices in which a two-dimensional electron gas may be polarized due to exchange interaction with an underlying magnetically-active Eu layer. Here we show that the Si-Rh-Si surface trilayer of the antiferromagnet EuRh2Si2 bears a surface state, which exhibits an unexpected and large spin splitting controllable by temperature. The splitting sets in below similar to 32.5 K, well above the ordering temperature of the Eu 4f moments (similar to 24.5 K) in the bulk, indicating a larger ordering temperature in the topmost Eu layers. The driving force for the itinerant ferromagnetism at the surface is the aforementioned exchange interaction. Such a splitting may also be induced into states of functional surface layers deposited onto the surface of EuRh2Si2 or similarly ordered magnetic materials with metallic or semiconducting properties.