Hall Current in Aluminum-Copper Composite
Enhancement of magnetoresistance due to a Hall current, which is induced by a nonuniform Hall effect across an interface between different metals, is discussed. Such a current causes an additional resistive loss, and the inter-metallic magnetoresistance should be observed. Since the polarity of the Hall effect in copper is opposite to that in aluminum, the effect might be conspicuous in an aluminum-copper composite. Reduction of the Hall current is essentially important for application of a highly conductive material to stabilizers of a superconducting cable. A method for the reduction is evaluated in relation to the surface resistance of an aluminum-copper interface in the stabilizer. Since the required surface resistance of the interface is considerably high, extra heat generation on current transfer is a great obstacle. A slit in the insulator layer is effective in reducing the contact resistance without releasing a large loop for the Hall current. There is a possible design to retain 90% conductivity of the original aluminum, even when a thick conductive sheath is used.
KeywordsHeat Generation Hall Effect Surface Resistance Hall Current Current Transfer
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