Exchange-biased magnetic vortices.

Conference · Tue Jul 01 04:00:00 EDT 2008 · IEEE Trans. Magn.

DOI:https://doi.org/10.1109/TMAG.2008.924547· OSTI ID:935283

Hoffmann, A; Sort, J; Buchanan, K S; Nogues, J

This paper reviews our work on the interplay between exchange bias due to the coupling of a ferromagnet to an antiferromagnet and the formation of magnetic vortices, which occur due to the patterning of a ferromagnet. Depending on the thermal and magnetic history, a variety of different effects can be observed. Thermal annealing in a saturating magnetic field establishes a spatially homogeneous exchange bias with a uniform unidirectional anisotropy. This results in an angular dependence of the magnetization reversal mode, which can be either via magnetization rotation or vortex nucleation and annihilation. In contrast, thermal annealing in a field smaller than the vortex annihilation field imprints the ferromagnetic vortex configuration in the antiferromagnet with high fidelity resulting in unusual asymmetric hysteresis loops. Furthermore, we discuss how the interfacial nature of the exchange bias can modify the vortex magnetization along the thickness of the ferromagnet.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; C02 Research Projects
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 935283
• Report Number(s): ANL/MSD/CP60536
• Conference Information: Journal Name: IEEE Trans. Magn. Journal Issue: 7 ; Jul. 2008 Journal Volume: 44
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANISOTROPY
ANNEALING
ANNIHILATION
CONFIGURATION
HYSTERESIS
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIZATION
NUCLEATION
ROTATION
THICKNESS