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March 25, 2011

Mtg: Magnetic Surface Nanostructures

by @ 3:03 pm. Filed under ALL, Computers/Software, Electronics Design, Engineering Mgmt, NanoEngineering

WEDNESDAY May 11, 2011
OEB Magnetics Chapter
Speaker: Dr. Axel Enders, Assistant Professor, University of Nebraska â?? Lincoln
Time: 3:00 PM
Cost: none
Place: Lawrence Berkeley National Labs, Berkeley
RSVP: required, by email to Catherine Jenkins

In this talk, I will discuss synthesis strategies for and magnetism of surfacesupported self-assembled Fe and Co nanostructures. Simple tricks of surface science are used to fabricate a variety of nanostructures, from simple impurity atoms to atomic chains, stripes, dots and surface alloys to more complex, ordered structures such as cluster arrays or metal-molecule networks. Such structures are fascinating research objects as they give us an unprecedented view on the evolution of fundamental magnetic properties, such as the magnetic anisotropy. I will highlight Co nanodot arrays formed by self-assembly on reconstructed W(110) substrates. It is demonstrated that clusters containing 3 â?? 12 atoms in varied geometries on W(110) surface exhibit antiferromagnetic coupling, which is in a drastic contrast to the strong ferromagnetic coupling in bulk phases of Co, ultrathin films and nanoclusters of Co on various fcc and bcc substrates. I will present STM studies and measurements of the cluster magnetization with XMCD that exclude ferromagnetic spin alignment and explain our findings with first principles calculations, which consider the hybridization of W and Co states. I will show how the particular strength of this study, which is the combination of local STM probing with areaintegrating magnetic dichroism and photoelectron spectroscopy measurements, can be deployed also for the study of metal-organic surface structures and multiferroic nanostructures.

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