Abstract
A superconducting quantum interference device (SQUID) magnetometer was used to study the magnetic fields induced by liquid–metal contact. A high- T c SQUID magnetometer operating in liquid nitrogen has been used. The magnetic fields (d B) were generated both normal to, and in parallel to the interface when liquid contacted the metal surface; provided both phases were at different temperatures. We observed the d B effects for a number of metal–liquid systems, i.e. NiCrMo, FeCr, Cu, and Al in water, 5% NaCl, acetone and isopropyl alcohol. No magnetic effects were observed from a polystyrene sample, instead of a metal one. The generation of magnetic fields was ascribed to the thermal initiation of internal currents in the metal phase. The magnitude of the d B effect may be comparable to the magnetic fields induced by corrosion reactions.
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