Just a fraction of a moment
Article Abstract:
The magnetic moment of microscopic clusters of atoms does not follow the Heisenberg model of ferromagnetism. In a repetition of the Stern-Gerlach experiment using clusters of 100-500 atoms of nickel and iron, J.A Becker and W.A. de Heer found the moment of these clusters close to that of their respective bulk materials for low temperatures. As the Curie temperature is approached, however, the magnetic moment for iron clusters does not approach zero as it does for bulk metals.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Relaxor ferroelectricity and colossal magnetocapacitive coupling in ferromagnetic CdCr2S4
Article Abstract:
The relaxor ferroelectricity in ferromagnetic CdCr2S4 and the occurrence of colossal magnetocapacitive effects in spinel system are examined. It is observed that in CdCr2S4, magnetization and polarization are compatible with a global cubic symmetry and all quantities are independent of the direction of the magnetic field with respect to the electric field, indicating that CdCr2S4 belongs to a new class of multiferroics.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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Taking the frustration out of ice
Article Abstract:
Evidence is provided by Ramirez and colleagues that the pyrochlore compound Dy(sub2)Ti(sub2)O(sub7) correlates to a new class of frustrated magnet, spin ice. It was noted in 1969 that the compound has residual entropy at low temperatures, which is numerically in good agreement with the Pauling entropy for ice. The current work reveals that Dy(sub2)Ti(sub2)O(sub7) and ice have the same entropy.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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