Magnetoresistance of single Permalloy circular rings (Articolo in rivista)

Type
Label
  • Magnetoresistance of single Permalloy circular rings (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Vavassori, P; Busato, A; Chiapatti, A; di Bona, A; Valeri, S; Metlushko, V; Ilic, B (2007)
    Magnetoresistance of single Permalloy circular rings
    in Journal of magnetism and magnetic materials
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Vavassori, P; Busato, A; Chiapatti, A; di Bona, A; Valeri, S; Metlushko, V; Ilic, B (literal)
Pagina inizio
  • E944 (literal)
Pagina fine
  • E947 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 316 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Ferrara, CNR, INFM S3, I-44100 Ferrara, Italy; Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy; Natl Res Ctr S3, CNR, INFM, I-41100 Modena, Italy; Univ Illinois, Dept Elect & Comp Engn, Chicago, IL 60607 USA; Cornell Univ, Sch Appl & Engn Phys, Cornell Nanofabricat Facil, Ithaca, NY 14853 USA (literal)
Titolo
  • Magnetoresistance of single Permalloy circular rings (literal)
Abstract
  • We have measured magnetoresistance in single, 1 mu m external diameter, Permalloy (Ni80Fe20) circular rings with varied inner hole diameter of 150, 300, and 600 nm and film thickness of 25 nm. The Permalloy ring structures and the 10-nm-thick, 250-nm-wide Au nanocontacts were fabricated on a SiO2/Si substrate using e-beam lithography. Using a four contact geometry we studied the dependence of the magnetoresistance on the direction of the applied field. The experimental data are explained by considering only the conventional anisotropic magnetoresistance effect. Numerical simulations of the current distribution within the samples combined with micromagnetic simulations of the field dependent magnetization profile, yield good agreement with the experimental data. Upon increasing the inner hole diameter (viz. decreasing the ring width) the magnetoresistance measurements show a transition of the reversal process from the 'vortex nucleation-displacement-annihilation' sequence to the 'onion state-reversed onion state' sequence, typical of narrow nanorings. (c) 2007 Elsevier B.V. All rights reserved. (literal)
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