Evidence for the Existence of Long-Range Magnetic Ordering in a Liquid Undercooled Metal

Abstract

Liquid ${\mathrm{Co}}_{100-x}{\mathrm{Pd}}_x$ alloys were undercooled below the Curie temperatures $T_C\left(s\right)$ of the ferromagnetic solid phase by using electromagnetic levitation. A modified Faraday balance was applied to measure the magnetization of the undercooled liquid sample as a function of temperature. A Curie-Weiss behavior is detected. The Curie temperature $T_C\left(l\right)$ is determined for the transition from the paramagnetic to the ferromagnetic state of this metallic liquid with long-range magnetic order. $T_C\left(l\right)$ is slightly smaller than $T_C\left(s\right)$.