Micromagnetics of Spin-Flop Bilayers: S, C, and Vortex Spin States

Author

Cherepov, S.S. ; Konovalenko, A. ; Korenivski, V. ; Worledge, D.C.

Author_Institution

Nanostruct. Phys., R. Inst. of Technol., Stockholm, Sweden

Volume

46

Issue

6

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

2124

Lastpage

2127

Abstract

Spin-flop tunnel junctions subjected to strong gigahertz excitations are found to exhibit highly stable resistance states, intermediate between the two spin-uniform ground states of high and low resistance. The associated spin distributions are necessarily nonuniform and differ significantly from the ground-state anti-parallel spin configuration in their static and dynamic properties. Detailed micromagnetic modeling reveals that inplane spin vortices in dipole-coupled thin-film bilayers are stable spin configurations, where the orientation of the vortex cores and the vortex chirality play an important role in the response of the system to external magnetic fields.

Keywords

antiferromagnetic materials; chirality; ground states; magnetic multilayers; magnetic structure; magnetic tunnelling; micromagnetics; associated spin distributions; dipole-coupled thin-film bilayers; dynamic properties; gigahertz excitations; ground-state antiparallel spin configuration; highly stable resistance states; inplane spin vortices; micromagnetic modeling; spin-flop bilayers; spin-flop tunnel junctions; spin-uniform ground states; static properties; vortex chirality; vortex cores; Magnetic cores; Magnetic domains; Magnetic field measurement; Magnetic fields; Magnetic films; Micromagnetics; Physics; Stationary state; Thermal stability; Transistors; MRAM; spin vortices; spin-flop tunnel junctions;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2010.2043716

Filename

5467443