Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 29: Micro- and Nanostructured Magnetic Materials II

MA 29.5: Talk

Wednesday, March 16, 2011, 12:00–12:15, HSZ 103

Extremely high coercivity of Co Islands on Ir(111) probed by spin-resolved scanning tunneling microscopy — •Jessica Bickel, Focko Meier, Jens Brede, Kirsten von Bergmann, and Roland Wiesendanger — Insitute of Applied Physics, University of Hamburg, Hamburg, Germany

As length scales continue to decrease, surfaces and small atomic clusters and islands play an increasingly large role in determining material properties. Thus it is imperative to study and understand the properties of small islands in order to further our fundamental understanding of reduced dimension properties and to exploit these properties for device applications.

Co islands on Ir(111) were examined by spin-resolved scanning tunneling microscopy (SPSTM) and spectroscopy. The Co islands grow pseudomorpically on the Ir substrate, forming triangular shaped islands with no regular dislocation structure and are magnetized perpendicular to the Ir surface. The islands have a high coercivity and require a field of B=5T to fully align all the islands in a magnetic field applied along the easy magnetization axis. Effects of the stray field of the SPSTM tip on island switching will be discussed.