Abstract
This study presents a novel equation for the magnetoresistive heat switch (MRHS) based on its orientation relative to the magnetic lines of force. The MRHS exhibits the lowest thermal conductivity when oriented at 90°, with magnetic lines penetrating a flat surface area, as indicated by the derived equations. Additionally, a correlation between electrical and thermal conductivities is used, considering the cross-sectional area to aid in optimizing the area. The comprehensive comparative analysis and switching ratio determine the minimum thermal conductivity as 0.249 W/(m·K) at 0.5 K and 3 T when oriented at 90°. The research involves two cross-sectional sections with dimensions of 2.25 and 4.375 mm2. The region with a dimension of 2.25 mm2 yields superior results in the OFF state, with switching ratio of 36,822 at 0.5 K. Notably, the thermal conductivity of the two cross-sections exhibits significant differences.
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