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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.