Interlayer magnetic coupling in Fe/MgO junctions characterized by vector magnetization measurements combined with polarized neutron reflectometry
Résumé
Polarized neutron reflectometry has been combined with vector magnetization measurements to analyze the reversal process of antiferromagnetically coupled Fe layers through an insulating MgO spacer. We show that the use of a simple micromagnetic model applied in a field range where the reversal process is reversible allows us to determine separately the magnetic characteristics of the layers such as the anisotropy, bilinear, and biquadratic coupling constants. Using this analysis technique, we can prove that in a Fe(001)/MgO/Fe trilayer with thicknesses 35 nm/0.6 nm/6 nm, the 90° configuration of the Fe layers occurring during the reversal mechanism is only related to the fourfold Fe anisotropy present in both layers without any biquadratic coupling.
Domaines
Matière Condensée [cond-mat]
Fichier principal
Interlayer magnetic coupling in FeMgO junctions characterized by vector magnetization measurements combined with polarized neutron reflectometryPhysRevB.78.134429.pdf (300.89 Ko)
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