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Title: Vortex magnetization reversal in double-layer ferromagnetic/antiferromagnetic dots.

Abstract

No abstract prepared.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
928647
Report Number(s):
ANL/MSD/JA-58538
Journal ID: ISSN 0021-8979; JAPIAU; TRN: US200812%%319
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Appl. Phys.; Journal Volume: 101; Journal Issue: May 1, 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; DEMAGNETIZATION; QUANTUM DOTS; FERROMAGNETIC MATERIALS; ANTIFERROMAGNETIC MATERIALS; LAMELLAE

Citation Formats

Guslineko, K. Y., Hoffmann, A., Materials Science Division, and Seoul Nat. Univ. Vortex magnetization reversal in double-layer ferromagnetic/antiferromagnetic dots.. United States: N. p., 2007. Web. doi:10.1063/1.2719620.
Guslineko, K. Y., Hoffmann, A., Materials Science Division, & Seoul Nat. Univ. Vortex magnetization reversal in double-layer ferromagnetic/antiferromagnetic dots.. United States. doi:10.1063/1.2719620.
Guslineko, K. Y., Hoffmann, A., Materials Science Division, and Seoul Nat. Univ. Tue . "Vortex magnetization reversal in double-layer ferromagnetic/antiferromagnetic dots.". United States. doi:10.1063/1.2719620.
@article{osti_928647,
title = {Vortex magnetization reversal in double-layer ferromagnetic/antiferromagnetic dots.},
author = {Guslineko, K. Y. and Hoffmann, A. and Materials Science Division and Seoul Nat. Univ.},
abstractNote = {No abstract prepared.},
doi = {10.1063/1.2719620},
journal = {J. Appl. Phys.},
number = May 1, 2007,
volume = 101,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}
  • Magnetic vortices have generated intense interest in recent years due to their unique reversal mechanisms, fascinating topological properties, and exciting potential applications. In addition, the exchange coupling of magnetic vortices to antiferromagnets has also been shown to lead to a range of novel phenomena and functionalities. Here we report a new magnetization reversal mode of magnetic vortices in exchange coupled Ir 20Mn 80/Fe 20Ni 80 microdots: distorted viscous vortex reversal. In contrast to the previously known or proposed reversal modes, the vortex is distorted close to the interface and viscously dragged due to the uncompensated spins of a thin antiferromagnet,more » which leads to unexpected asymmetries in the annihilation and nucleation fields. Lastly, these results provide a deeper understanding of the physics of exchange coupled vortices and may also have important implications for applications involving exchange coupled nanostructures.« less
  • Magnetic vortices have generated intense interest in recent years due to their unique reversal mechanisms, fascinating topological properties, and exciting potential applications. In addition, the exchange coupling of magnetic vortices to antiferromagnets has also been shown to lead to a range of novel phenomena and functionalities. Here we report a new magnetization reversal mode of magnetic vortices in exchange coupled Ir 20Mn 80/Fe 20Ni 80 microdots: distorted viscous vortex reversal. In contrast to the previously known or proposed reversal modes, the vortex is distorted close to the interface and viscously dragged due to the uncompensated spins of a thin antiferromagnet,more » which leads to unexpected asymmetries in the annihilation and nucleation fields. These results provide a deeper understanding of the physics of exchange coupled vortices and may also have important implications for applications involving exchange coupled nanostructures.« less
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  • The magnetization reversal process for micron and submicron disk-shaped dots is controlled by successive nucleation, displacement,and annihilation of a magnetic vortex. Here the reversal process for a system involving two ferromagnetic disks separated by a nonmagnetic spacer is investigated experimentally, analytically, and numerically.Permalloy Ni80Fe20 or Py dots with thicknesses of up to 40 nm and diameters of 0.5-2.5 um separated by a copper spacer 1-45 nm thick were considered. Micromagnetic simulations indicate that the disks will each support oppositely directed vortices at remanence and also show the hysteresis of the coupled structures. The calculations are compared to hysteresis loops andmore » x-ray photoemission electron microscopy images of Py/Cu/Py dots produced by electron-beam lithography and magnetron sputtering.« less
  • The effect of antiferromagnetic (AFM) layer on exchange bias (EB), training effect, and magnetotransport properties in ferromagnetic (FM) /AFM nanoscale antidot arrays and sheet films Ag(10 nm)/Co(8 nm)/NiO(t{sub NiO})/Ag(5 nm) at 10 K is studied. The AFM layer thickness dependence of the EB field shows a peak at t{sub NiO} = 2 nm that is explained by using the random field model. The misalignment of magnetic moments in the three-dimensional antidot arrays causes smaller decrease of EB field compared with that in the sheet films for training effect. The anomalous magnetotransport properties, in particular positive magnetoresistance (MR) for antidot arrays but negative MR for sheet films aremore » found. The training effect and magnetotransport properties are strongly affected by the three-dimensional spin-alignment effects in the antidot arrays.« less