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MA: Fachverband Magnetismus

MA 17: Magnetic Thin Films I

MA 17.7: Vortrag

Mittwoch, 25. März 2009, 11:45–12:00, HSZ 04

Stress, structure and magnetism of epitaxial Fe monolayers on Ir(100)-(1x1) — •Zhen Tian, Dirk Sander, Fikret Yildiz, Marek Przybylski, and Jürgen Kirschner — Max-Plank Institute of Microsctructure Physics, 06120, Halle, Germany

We have performed combined LEED, stress and magneto optic Kerr effect (MOKE) measurements on Fe monolayers on Ir(100). Our experimental results indicate pseudomorphic growth of Fe layers from 0 to 10 ML. The large mismatch of −5.3% between Fe and the Ir(100) substrate leads to a bct Fe lattice under compressive stress of −10 GPa[1]. Ferromagnetic hysteresis loops are observed for Fe thickness above 4 ML at room temperature, with an easy magnetization axis in plane. The Curie temperature of 4 ML Fe is around 200 K. MOKE measurements are performed with both longitudinal and polar geometry from 300 K down to 5 K. Up to 3 ML, the film does not show a ferromagnetic responses in magnetic fields of up to 0.5 T. These results are discussed in view of results on the related system of Fe on Rh(001)[2], and also in view of a possible 2 ML fcc Fe precursor on Ir(100)[1].

[1]V. Martin et al. Phys. Rev. B, 76 (2007) 205418 [2]K. Hayashi et al. Phys. Rev. B, 64 (2001) 054417