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|Type:||Artigo de periódico|
|Abstract:||The giant magnetoimpedance (GMI) effect consists of the huge change of both real and imaginary parts of the impedance upon the application of static magnetic field. The relative change of impedance can reach ratios up to around 700%, with extremely large sensitivities in the very low field region. It is the aim of the present work to summarize and update the increasing amount of information accumulated about the giant magnetoimpedance phenomenon. After a short historical review, an overview of GMI is given, including a brief analysis of the phenomenology of GMI, where three frequency regimes can be roughly evidenced and studied applying somewhat different approaches. The work includes a detailed theoretical framework of GMI, together with the current topics of basic investigation in this field. Several novel experimental results are shown, including the extensive use of giant magnetoimpedance as a tool to investigate intrinsic and extrinsic magnetic properties of soft magnetic materials. With the theoretical and experimental developments in mind, the applications of GMI are detailed, going from interesting proposed prototypes to devices which are already on the market. A clear comparison of GMI sensors with other type of sensors is given. GMI opens a new branch of research by combining classical electrodynamics and micromagnetism of soft ferromagnetic materials. © 2003 Elsevier Science B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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