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Title: Loop bifurcation and magnetization rotation in exchange-biased Ni/FeF2
Author: Olamit, J.
Arenholz, E.
Li, Zhi-Pan
Petracic, Oleg
Roshchin, Igor V.
Morales, R.
Batlle Gelabert, Xavier
Schuller, Ivan K.
Liu, Kai
Keywords: Rotació molecular
Propietats magnètiques
Magnetic properties
Molecular rotation
Issue Date: 2005
Publisher: The American Physical Society
Abstract: Exchange-biased Ni/FeF2 films have been investigated using vector coil vibrating-sample magnetometry as a function of the cooling field strength HFC . In films with epitaxial FeF2 , a loop bifurcation develops with increasing HFC as it divides into two sub-loops shifted oppositely from zero field by the same amount. The positively biased sub-loop grows in size with HFC until only a single positively shifted loop is found. Throughout this process, the negative and positive (sub)loop shifts maintain the same discrete value. This is in sharp contrast to films with twinned FeF2 where the exchange field gradually changes with increasing HFC . The transverse magnetization shows clear correlations with the longitudinal subloops. Interestingly, over 85% of the Ni reverses its magnetization by rotation, either in one step or through two successive rotations. These results are due to the single-crystal nature of the antiferromagnetic FeF2 , which breaks down into two opposite regions of large domains.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2005, vol. 72, núm. 1, p. 012408-1-012408-4
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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