Seminars Archive

Orbital moments and their anisotropy at surfaces and interface studied with X-Ray magnetic circular dichroism

Abstract
Orbital moments play an important role in the anisotropy of magnetic materials. At surfaces and interfaces they can be strongly enhanced, and give rise to perpendicular anisotropy. X-ray Magnetic Circular Dichroism (XMCD) in absorption is the ideal tool to probe orbital moments and their anisotropy in an element selective way. Examples will be given for several systems, like Fe ribbons made with the "atomic saw" method [1], Co deposited on a vicinal Cu surface [2] and PdCo and PtCo systems [3]. In the latter systems, the role of the 4d and 5d magnetic moments will be emphasized. Other methods to measure directly the anisotropy, like transverse XMCD and X-ray Magnetic Linear Dichroism (XMLD) will be discussed. [1] J.P.Peyrade, F.Voillot and M.Goiran, Appl.Phys.Lett. 60, 2481 (1992). [2] H.A.Durr, G.van der Laan, J.Vogel, G.Panaccione, N.B.Brookes, E.Dudzik and R.M.Grath, Phys.Rev.B 58, R11853 (1998). [3] W.Grange, M.Maret, J.-P.Kappler, J.Vogel, A.Fontaine, F.Petroff, G.Krill, A.Rogalev, J.Goulon, M.Finazzi and N.B.Brookes, Phys.Rev.B 58, 6298 (1998).