Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.112: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Spin-polarized scanning tunnelling spectroscopy of ultrathin Fe/Mo(110) films — •A. Kukunin, J. Prokop, and H.J. Elmers — Johannes Gutenberg-Universität Mainz, Institut für Physik, Staudingerweg 7, D-55099 Mainz

Using W/Au/Co tips we have performed low-temperature spin-polarized scanning tunneling spectroscopy (SP-STS) of ML and DL Fe nanostripes, and thicker (3-6 ML) Fe islands grown by step flow on a Mo(110) single crystal. We focus our studies on the range of positive voltages (−0.2 V<U<1 V), where the unoccupied states of the sample are probed by the occupied tip states. The spin-resolved spectra for the perpendicularly magnetized ML and DL Fe nanowires have been obtained using W/Au/Co tips with out-of-plane sensitivity, whereas spin-resolved spectra for the in-plane magnetized Fe islands have been measured with an in-plane sensitive W/Au/Co tips.

We find that the spin-resolved spectra for the ML, DL and thicker Fe/Mo films are different. Spectra for the ML Fe stripes reveal prominent peak that shows up at U = +0.38 V or at U = +0.42 V. Spectra for the DL Fe stripes reveal two large peaks at -0.08 V and 0.78 V, and two smaller peaks at 0.06 V and 0.2 V. Peak positions and intensities depend on the relative orientation of tip and sample magnetization. In contrast to the ML and DL Fe spectra, spectra for the Fe islands do not show any pronounced peaks for positive voltages. However, they strongly differ from each other, depending on the relative orientation of the tip and Fe island magnetization. Spin-resolved spectroscopic data are compared with the spectroscopic data obtained using other tips and discussed.