Magnetoresistive system with concentric ferromagnetic asymmetric nanorings

Journal Article · Sat Mar 14 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4914346· OSTI ID:22399247

Tumelero, M. A.; Pasa, A. A.; Viegas, A. D. C. ^[1]

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1. Laboratório de Filmes Finos e Superfícies (LFFS), Departamento de Física, Universidade Federal de Santa Catarina, CP 476 Florianópolis (Brazil)

A structure consisting of two concentric asymmetric nanorings, each displaying vortex remanent states, is studied with micromagnetic calculations. By orienting in suitable directions, both the asymmetry of the rings and a uniform magnetic field, the vortices chiralities can be switched from parallel to antiparallel, obtaining in this way the analogue of the ferromagnetic and antiferromagnetic configurations found in bar magnets pairs. Conditions on the thickness of single rings to obtain vortex states, as well as formulas for their remanent magnetization are given. The concentric ring structure enables the creation of magnetoresistive systems comprising the qualities of magnetic nanorings, such as low stray fields and high stability. A possible application is as contacts in spin injection in semiconductors, and estimations obtained here of magnetoresistance change for a cylindrical spin injection based device show significant variations comparable to linear geometries.

• OSTI ID: 22399247
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
77 NANOSCIENCE AND NANOTECHNOLOGY
ANTIFERROMAGNETISM
ASYMMETRY
CHIRALITY
COMPARATIVE EVALUATIONS
CYLINDRICAL CONFIGURATION
FERROMAGNETIC MATERIALS
FERROMAGNETISM
MAGNETIC FIELDS
MAGNETIZATION
MAGNETORESISTANCE
MAGNETS
NANOSTRUCTURES
PHASE STABILITY
RINGS
SEMICONDUCTOR MATERIALS
SPIN
VORTICES