FLUX CONTROL OF MAGNETIC PASTE BY MAGNETIC HIGH-POLYMER MATERIAL IN HIGH FREQUENCY BAND AND ITS APPLICATION

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Magnetic agar obtained by mixing agar with water-basis magnetic fluid has several interesting features, e.g. being endowed with magnetism and a water holding property, being rich in flexibility in a jelly-like style, being susceptible to change in viscosity in accordance with temperatures, etc. By making the most of these features, practical application can be considered with this seaweed-derived gelatinous material in such a way of utilizing magnetic heating paste enabling us to exclusively heat specific portions by applying paste in possession of magnetic performance and high-frequency magnetic field, high-frequency magnetic shield materials, etc.However it is regrettable that sufficient investigation has never been made with a metrological method and evaluation of high-frequency magnetic performance of magnetic agar as a magnetic material.In this study, adoption of an internal excitation method as a metrological means for the magnetic performance of the magnetic agar is proposed, and influence of the magnetic permeability of the sample, frequency limitation, and magnetic measurement error are described. In addition, results of the metrology of the magnetic permeability practically conducted with magnetic agar are shown. Furthermore a result of investigation concerning magnetic core loss of the magnetic agar has been explained.