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2013•Applied Physics LettersRequires access

Effect of magnetic order on nucleation in undercooled Co80Pd20 melts

Shengyin Zhou, Rui Hua Hu, Jinshan Li, Hui Chang, Hongchao Kou, Lian Zhou

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Abstract

Co80Pd20 melts have been undercooled below Curie temperature of the liquids (TCL) by employing the method of molten glass denucleation combined with cyclic superheating. The largest undercooling achieved is 465 K, which indicates that the nucleation temperature is below TCL more than 100 K and then the ferromagnetic liquid is obtained. The nucleation behavior is analyzed using the classical nucleation theory extended by magnetic contributions to the Gibbs free energy. The results reveal that the onset of magnetic order facilitates rather than stimulates nucleation. Consequently, Co80Pd20 melts can be undercooled below TCL.

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What this paper is about

Co80Pd20 melts have been undercooled below Curie temperature of the liquids (TCL) by employing the method of molten glass denucleation combined with cyclic superheating. The largest undercooling achieved is 465 K, which indicates that the nucleation temperature is below TCL more than 100 K and then the ferromagnetic liquid is obtained. The nucleation behavior is analyzed using the classical nucleation theory extended by magnetic contributions to the Gibbs free energy. The results reveal that the onset of magnetic order facilitates rather than stimulates nucleation. Consequently, Co80Pd20 melts can be undercooled below TCL.

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Available abstract

Co80Pd20 melts have been undercooled below Curie temperature of the liquids (TCL) by employing the method of molten glass denucleation combined with cyclic superheating. The largest undercooling achieved is 465 K, which indicates that the nucleation temperature is below TCL more than 100 K and then the ferromagnetic liquid is obtained. The nucleation behavior is analyzed using the classical nucleation theory extended by magnetic contributions to the Gibbs free energy. The results reveal that the onset of magnetic order facilitates rather than stimulates nucleation. Consequently, Co80Pd20 melts can be undercooled below TCL.

Key concepts: Supercooling, Nucleation, Superheating, Thermodynamics, Materials science, Ferromagnetism, Gibbs free energy, Curie temperature

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