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

Reske, J.; Herlach, D.M.; Keuser, F.; Maier, K.; Platzek, D.

doi:10.1103/physrevlett.75.737

Cited by 61 publications

(45 citation statements)

References 6 publications

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“…The measured Curie temperature of the melt, T C L , lies approximately DT C SL = 20 K below that of the solid, T C S . These results were confirmed by muon-spin rotation experiments [5].Most undercooling studies on Co-based alloy melts revealed no undercoolings below T C L [3,4,5,6,7,8] although different experimental techniques were used. However, in one experiment [9] on small and comparatively fast-cooled liquid Co 80 Pd 20 droplets undercoolings below T C L were reported.…”

supporting

confidence: 67%

“…1). For pure Co T C L lies 6 K below T C S [10], while for Co 80 Pd 20 the difference amounts to 18 K [4]. Based on these results we assume a linear composition-dependence of DT C SL = T C S -T C L : For the calculation of the magnetic contribution on the driving force for nucleation in Co-Pd melts it is crucial to consider that the composition x N of the nucleus differs from the nominal composition x 0 of the melt.…”

Section: Extension Of the Classical Nucleation Model By Magnetic Contmentioning

confidence: 99%

“…Studies of the temperature-dependence of the magnetization of electromagnetically levitated Co 80 Pd 20 specimens with a modified Faraday balance [4] revealed a Curie-Weiss behavior. The measured Curie temperature of the melt, T C L , lies approximately DT C SL = 20 K below that of the solid, T C S .…”

Section: Introductionmentioning

confidence: 99%

“…Most undercooling studies on Co-based alloy melts revealed no undercoolings below T C L [3,4,5,6,7,8] although different experimental techniques were used. However, in one experiment [9] on small and comparatively fast-cooled liquid Co 80 Pd 20 droplets undercoolings below T C L were reported.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magnetic Effects on the Nucleation in Undercooled Co‐Pd Melts

Holland‐Moritz¹,

Spaepen²

2004

Solidification and Crystallization

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supporting

confidence: 67%

Section: Extension Of the Classical Nucleation Model By Magnetic Contmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Effects on the Nucleation in Undercooled Co‐Pd Melts

Holland‐Moritz¹,

Spaepen²

2004

Solidification and Crystallization

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“…At large Co concentrations the deeply undercooled melt shows magnetic ordering in the liquid state. This is indicated by attractive interaction between deeply undercooled Co 80 Pd 20 alloy and an external strong CoSm magnet, [43] measurements of the magnetic susceptibility [44] and muon spin relaxation measurements [45] on the same alloy. More recent investigations on pure liquid Co processed by the melt fluxing technique in a strong external magnetic field undercooled to 339 K (339°C) that is only 35 K (35°C) above the Curie temperature of solid Co.…”

Section: A Structural Short-range Ordermentioning

confidence: 99%

Containerless Undercooled Melts: Ordering, Nucleation, and Dendrite Growth

Herlach

Binder

Galenko

et al. 2015

Metall Mater Trans A

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Electromagnetic and electrostatic levitation are applied to containerless undercool and solidify metallic melts. A large undercooling range becomes accessible with the extra benefit that the freely suspended drop is accessible directly for in situ observation. The short-range order in undercooled melts is investigated by combining levitation with elastic neutron scattering and X-ray scattering using synchrotron radiation. Muon Spin Rotation (lSR) experiments show magnetic ordering in deeply undercooled Co 80 Pd 20 alloys. The onset of magnetic ordering stimulates nucleation. Results on nucleation undercooling of zirconium are presented showing the limit of maximum undercoolability set by the onset of homogeneous nucleation. Metastable phase diagrams are determined by applying energy-dispersive X-ray diffraction of Ni-V alloys with varying concentration. Nucleation is followed by crystal growth. Rapid dendrite growth velocity is measured on levitation-processed samples as a function of undercooling DT by using high-speed video camera technique. Solute trapping in dilute solid solutions and disorder trapping in intermetallic compounds are experimentally verified. Measurements of glass-forming Cu-Zr alloy show a maximum in the V(DT) relation that is indicative for diffusion-controlled growth. The influence of convection on dendrite growth of Al 50 Ni 50 is shown by comparative measurements of dendrite growth velocity on Earth and in reduced gravity. Eventually, faceting of a rough interface by convection is presented as observed on Ni 2 B alloys.

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First-Principles Theory of Ferromagnetic and Antiferromagnetic Order

Fritsche

Weimert

1998

phys. stat. sol. (b)

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Contents 1. Introduction 2. General aspects and relation to earlier work 3. Energy gain in an N-electron system by setting up spin order 4. Reducing the problem of spin-ordered N-electron systems to a one-particle problem 5. Method of systematically improving the approximation to the exchange±correlation energy 6. Transition from the paramagnetic to the spin-ordered case: energy balance 7. Spin order in atoms: a simple case 8. Crucial criterion for the occupation numbers in the ground state 9. Ferromagnetic order in solids 10. Ferromagnetic order in molten metals 11. Antiferromagnetic order 12. Results ConclusionsReferences

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

Cited by 61 publications

References 6 publications

Magnetic Effects on the Nucleation in Undercooled Co‐Pd Melts

Magnetic Effects on the Nucleation in Undercooled Co‐Pd Melts

Containerless Undercooled Melts: Ordering, Nucleation, and Dendrite Growth

First-Principles Theory of Ferromagnetic and Antiferromagnetic Order

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