Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 33: Messmethoden, Anisotropie, Spinelektronik/Spininjektion

MA 33.7: Vortrag

Mittwoch, 9. März 2005, 12:30–12:45, TU EMH225

Magnetic Properties of Gd-doped EuO Thin Films — •R. Sutarto¹, H. Ott¹, S. Heise¹, H.-H. Hsieh², H.-J. Lin², C.T. Chen², and L.H. Tjeng¹ — ¹II. Physikalisches Institut, Universität zu Köln — ²NSRRC, Hsinchu, Taiwan

We have successfully grown Gd-doped EuO thin films at different doping levels from 2 to 20% using molecular beam epitaxy (MBE). Soft x-ray magnetic circular dichroism (XMCD) measurements at the Eu M_4,5-edges indicate a strong enhancement of the Curie temperature compared to T_c=69 K for undoped EuO. We found a maximum T_c of 180 K at Gd-doping level 4-5%. This enhancement of T_c was further observed in the exchange splitting in the O 1s XAS spectra. Gd-M_4,5 XMCD spectra reveal that Eu and Gdspins align parallel at all doping levels.