Method and arrangement for detecting changes of a magnetic response in magnetic particles
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United States of America Patent
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Nov 30, 2004
Grant Date -
Sep 11, 2003
app pub date -
Dec 30, 2002
filing date -
Aug 31, 2001
priority date (Note) -
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Abstract
A method for detecting changes of magnetic response of at least one magnetic particle provided with a external layer in a carrier fluid, comprising measuring the characteristic rotation time of the magnetic particle with respect to the external layer, and measuring Brownian relaxation in the carrier fluid under the influence of an external alternating magnetic field. The method implies that upon modification of the effective volume of the particle or its interaction with the carrier fluid, a hydrodynamic volume of the particle changes, which implies a change of the frequency (.function..sub.max) at which an out of phase component of the magnetic susceptibility has its maximum.
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