Remote control of the Fe magnetic moment in magnetic heterostructuresA. Remhof1, G. Nowak1, H. Zabel1, M. Björck2, M. Pärnaste2, B. Hjörvarsson2 and V. Uzdin3
1 Department of Physics, Ruhr-University Bochum - 44780 Bochum, Germany
2 Department of Physics, Uppsala University - Box 530, 75121 Uppsala, Sweden
3 Saint-Petersburg State University, Vasilevsky Ostrov - 10 linia 49, 199178, Saint-Petersburg, Russia
received 13 April 2007; accepted in final form 15 June 2007; published August 2007
published online 19 July 2007
In magnetic superlattices with interlayer exchange coupling, not only the coupling strength but also the magnetic moment of the ferromagnetic layer can be altered non-locally by modifying the electronic structure of the non-magnetic spacer layer. Specifically, changes of the electronic structure of the V spacer layers in Fe/V (001) superlattices are seen to affect the adjacent Fe layers. By reversibly loading the V layer with hydrogen, the magnetic moment of Fe increases, whereas the induced magnetic moment in V remains unchanged. The nature of this remote and non-local control of the magnetic moment is connected with a d-electron charge transfer and effective shift of the Fermi level relative to the d-bands of Fe and V, as elucidated on the basis of self-consistent electronic structure calculations.
75.70.Cn - Magnetic properties of interfaces (multilayers, superlattices, heterostructures).
75.30.Et - Exchange and superexchange interactions.
75.50.Bb - Fe and its alloys.
© Europhysics Letters Association 2007