Open AccessESTIMATION OF LOW-CONCENTRATION MAGNETIC FLUID DENSITY WITH GMR SENSOR
Author(s) -
S. Yamada,
Chinthaka P. Gooneratne,
Komkrit Chomsuwan,
M. Iwahara,
Makiko Kakikawa,
Donald O. Thompson,
Dale E. Chimenti
Publication year - 2008
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.177
H-Index - 75
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.2902756
Subject(s) - magnetite , giant magnetoresistance , materials science , magnetic field , magnetoresistance , biomagnetism , condensed matter physics , hysteresis , magnetic hysteresis , magnetometer , nuclear magnetic resonance , magnetization , physics , metallurgy , quantum mechanics
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. © 2008 American Institute of Physics
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