Estimation of low-concentration magnetic fluid density with GMR sensor

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Publication Details

Author list: Yamada S., Gooneratne C., Chomsuwan K., Iwahara M., Kakikawa M.

Publisher: American Institute of Physics

Publication year: 2008

Volume number: 975

Start page: 873

End page: 880

Number of pages: 8

ISBN: 9780735404946

ISSN: 0094-243X

eISSN: 1551-7616

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-40849106697&doi=10.1063%2f1.2902756&partnerID=40&md5=f2a259cafeaeee53be2575b09d675147

Languages: English-Great Britain (EN-GB)

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Abstract

This paper describes a new application of a spin-valve type giant magnetoresistance sensor in the biomedical field. The hyperthermia treatment, based on the hysteresis loss of magnetite under external ac fields, requires determination of the content density of magnetite injected inside the body to control the heat capacity. We propose a low-invasive methodology to estimate the density of magnetite by measuring magnetic fields inside the cavity. For this purpose, we investigated the relationship between the density of magnetite and the magnetic fields, and developed a needle-type magnetic probe with a giant magnetoresistance sensor for low-invasive measurement. The experimental results demonstrate the possibility of estimating the low-concentration density of magnetite injected into the body. ฉ 2008 American Institute of Physics.

Keywords

Estimation and low-invasion, Giant magnetoresistance, Hyperthermia, Magnetic fluid