Regensburg 2000 – wissenschaftliches Programm

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AM: Magnetismus

AM 23: Dünne Schichten IV: Magnetisierung und Spinstrukturen

AM 23.8: Vortrag

Donnerstag, 30. März 2000, 17:15–17:30, H22

Layer-resolved magnetic moments in Ni/Pt multilayers — •P. Poulopoulos¹, F. Wilhelm¹, G. Ceballos¹, P. Srivastava¹, H. Wende¹, K. Baberschke¹, D. Benea², H. Ebert², M. Angelakeris³, N.K. Flevaris³, D. Niarchos⁴, A. Rogalev⁵, and N.B. Brookes⁵ — ¹Inst. f. Exp. Physik, FU Berlin, Arnimallee 14, D-14195 Berlin — ²Inst. f. Phys. Chemie, LMU München, Butenandtstr. 5-13, D-81377 München, Germany — ³Dept. of Phys., Aristotle University, 54006 Thessaloniki, Greece — ⁴Inst. of Mat. Sci., NCSR-Demokritos, 15310 Athens, Greece — ⁵ESRF, B.P. 220, 38043 Grenoble, France

The layer-dependent distribution of the magnetic moments in Ni/Pt multilayers is obtained via a combination of powerful experimental and ab initio theoretical techniques. The magnetization of Ni/Pt multilayers was first determined by SQUID-magnetometry. The element specific x-ray magnetic circular dichroism allowed us, in addition, to separate the contribution of Ni and Pt and provided a layer-resolved magnetic moment profile for the whole system. The results are compared to band-structure calculations carried out by using the linearized muffin-tin orbital method. In accordance with theory, it is concluded from the experimental data that the magnetic moment induced on the Pt-sites is localized mostly at the interface. The interface Ni moment decreases with the Pt thickness. No magnetically dead layers are found. Compared to bulk NiPt alloys, the magnetization per Ni volume is found to be slightly enhanced [1]. Supported by BMBF05 SC8 (KEA3, WMA7) and ESRF(HE-422).

[1] F. Wilhelm et al., submitted to PRB