Regensburg 2002 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Magnetische Dünne Schichten I

MA 13.13: Vortrag

Mittwoch, 13. März 2002, 18:15–18:30, H10

Induced magnetic moments in 5d layers and the violation of the third Hund’s rule — •P. Poulopoulos¹, F. Wilhelm², H. Wende¹, A. Scherz¹, K. Baberschke¹, M. Angelakeris³, N.K. Flevaris³, and A. Rogalev² — ¹Institut f"ur Experimentalphysik, Freie Universit"at Berlin, Arnimallee 14, D-14195 Berlin-Dahlem, Germany — ²European Synchrotron Radiation Facility (ESRF), B.P.220, 38043 Grenoble, France — ³Department of Physics, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece

XMCD experiments at the begin (W) and the end (Ir, Pt) of the 5d series of the Periodic Table show considerable induced magnetic moments of about 0.2 µ_B/atom for the non-magnetic W and Ir at their interface with Fe. The results are compared to previous data for the Pt induced moments in Ni/Pt multilayers [1,2]. W couples antiferromagnetically and Ir ferromagnetically to the 3d layers. However, the W spin and orbital magnetic moment couple in parallel, contrary to what it is expected from the third Hund’s rule. This remarkable finding [3] shows that the induced magnetic behavior of 5d layers may be radically different than that of impurities and alloys. Theoretical approaches will be discussed.
Supported by the BMBF (05 KS1 KEB 4), DFG, Sfb 290 and the ESRF.

[1] F. Wilhelm et al., Phys. Rev. Lett. 85, 413 (2000)

[2] P. Poulopoulos et al., J. Appl. Phys. 89, 3874 (2001)

[3] F. Wilhelm et al., Phys. Rev. Lett. 87, 207202 (2001)