Special Issue: Modern Sensing Technologies

Vol. 90, April 2008, pp. 27-38

Estimation of Low Concentration Magnetic Fluid Weight Density and Detection inside an Artificial Medium

Using a Novel GMR Sensor

Chinthaka GOONERATNE, ^*Agnieszka ŁEKAWA, Masayoshi IWAHARA, Makiko KAKIKAWA and Sotoshi YAMADA

Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan

^*Lublin University of Technology, Lublin, Poland

E-mail: chinthaka.gooneratne@gmail.com, yamada@magstar.ec.t.kanazawa-u.ac.jp

Received: 15 October 2007   /Accepted: 20 February 2008   /Published: 15 April 2008

Abstract: Hyperthermia treatment has been gaining momentum in the past few years as a possible method to manage cancer. Cancer cells are different to normal cells in many ways including how they react to heat. Due to this difference it is possible for hyperthermia treatment to destroy cancer cells without harming the healthy normal cells surrounding the tumor. Magnetic particles injected into the body generate heat by hysteresis loss and temperature is increased when a time varying external magnetic field is applied. Successful treatment depends on how efficiently the heat is controlled. Thus, it is very important to estimate the magnetic fluid density in the body. Experimental apparatus designed for testing, numerical analysis, and results obtained by experimentation using a simple yet novel and minimally invasive needle type spin-valve giant magnetoresistance (SV-GMR) sensor, to estimate low concentration magnetic fluid weight density and detection of magnetic fluid in a reference medium is reported.

Keywords: Hyperthermia treatment, SV-GMR sensor, Low-invasive, Magnetic fluid, Demagnetizing factor

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