Dresden 2006 – scientific programme
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MA: Magnetismus
MA 24: Magnetic Thin Films III
MA 24.9: Talk
Thursday, March 30, 2006, 12:15–12:30, HSZ 03
Antiferromagnetic centers in Fe3-xO4 magnetite films — •Ivo Knittel1, Jiandong Wei1, Yang Zhou2, Igor Shvets2, and Uwe Hartmann1 — 1Department of Experimental Physics, University of Saarbrücken, Saarbrücken, Germany — 2SFI Nanoscience Laboratory, School of Physics, Trinity College Dublin, Dublin 2, Ireland
Defects in ferrite can change the local magnetic coupling from ferromagnetic to strongly antiferromagnetic. In epitaxial films of magnetite (Fe3O4), defects with this property, antiphase boundaries (APB), essentially determine magnetic and magnetotransport properties. We imaged antiferromagnetic dipolar centers in epitaxial slightly oxidized Fe3O4/MgO films by magnetic force microscopy in external magnetic field. Magnetization reversal of isolated and interacting groups of dipolar centers is shown. The observed centers are stable up to the maximum value of the applied fields.