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Accurate measurement of the specific absorption rate using a suitable adiabatic magnetothermal setup

AuthorsNatividad, Eva; Castro, Miguel; Mediano, Arturo
Issue Date5-Mar-2008
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 92(9): 093116 (2008)
AbstractAccurate measurements of the specific absorption rate (SAR) of solids and fluids were obtained by a calorimetric method, using a special-purpose setup working under adiabatic conditions. Unlike in current nonadiabatic setups, the weak heat exchange with the surroundings allowed a straightforward determination of temperature increments, avoiding the usual initial-time approximations. The measurements performed on a commercial magnetite aqueous ferrofluid revealed a good reproducibility (4%). Also, the measurements on a copper sample allowed comparison between experimental and theoretical values: adiabatic conditions gave SAR values only 3% higher than the theoretical ones, while the typical nonadiabatic method underestimated SAR by 21%.
Description3 pages, 3 figures.
Publisher version (URL)http://dx.doi.org/10.1063/1.2891084
Appears in Collections:(ICMA) Artículos
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