Magnetic Field Enhancement with Soft Magnetic Flux Guides

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2008

Autores

leitao, d. c. (Autor) Outra; trindade, i. g. (Autor) Outra; fermento, r. (Autor) Outra; araujo, j. p. (Autor) FCUP; cardoso, s. (Autor) Outra; freitas, p. p. (Autor) Outra; sousa, j. b. (Autor) FCUP

Ata de Conferência Internacional

Título: Advanced Materials Forum IV

Páginas: 313-317

IV International Materials Symposium Materiais 2007 and XIII Encontro da Sociedade Portuguesa de Materiais

Porto, Portugal, April 1-4, 2007

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 1 Citação

Outras Informações

ID Authenticus: P-004-27S

Abstract (EN): In this work, a study of the sensitivity enhancement of spin valve sensors, when located in close proximity to magnetic flux guides, is presented. The magnetoresistance (MR) of spin-valve sensors. lithographically patterned into stripes with lateral dimensions, (length) I = 500 mu m. (width) W-sensor = 1, 2. 6 mu m and placed near one/two Co93.5Zr2.8Nb3.7 (CZN) magnetic flux guide, is characterized at room temperature. CZN has a high permeability that together with a defined microstructured shape, is able to concentrate the magnetic flux in a small area, leading to an increase in sensor's sensitivity. The magnetic field amplification is estimated by comparison of sensor sensitivity with/without magnetic flux guides, in the linear operation range, and studied as a function of different parameters. Besides an enhancement in sensitivity, sensors also exhibit an important increase in the hard axis coercivity and a shift froth MR(H=o) = 0.5, both attributed to the magnetic flux guides. Amplification factors of the order of 20 are observed.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5