Magnetic Field Enhancement with Soft Magnetic Flux Guides

• Type: Article in International Conference Proceedings Book
• Date: 2008

Authors

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

Conference proceedings International

Title: Advanced Materials Forum IV

Pages: 313-317

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

Porto, Portugal, April 1-4, 2007

Indexing

ISI Web of Knowledge - 0 Citations

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Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5