Physical Review Letters -- May 29, 2000 -- Volume 84, Issue 22 pp. 5212-5215 

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Real-Space Observation of Dipolar Antiferromagnetism in Magnetic Nanowires by Spin-Polarized Scanning Tunneling Spectroscopy

      O. Pietzsch, A. Kubetzka, M. Bode, and R. Wiesendanger 
      Institute of Applied Physics and Microstructure Research Center, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany 

(Received 17 December 1999) 

We have performed spin-polarized scanning tunneling spectroscopy of dipolar antiferromagnetically coupled Fe nanowires with a height of two atomic layers and an average separation of 8 nm grown
on stepped W(110). Domain walls within the nanowires exhibit a significantly reduced width when pinned at structural constrictions. The lateral spin reorientation in the direction perpendicular to the
wires has been studied with subnanometer spatial resolution. It is found that the spin canting in the Fe nanowires monotonously increases towards the step edges. ©2000 The American Physical
Society 

URL: http://link.aps.org/abstract/PRL/v84/p5212 
DOI: 10.1103/PhysRevLett.84.5212 
PACS: 75.25.+z, 75.30.Pd, 75.70.Kw