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.

Metallography

---

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.

Science & research, Evaluation, Magnetic fields, Electric fields

---

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.

Condensed matter, Ice

Similar abstracts:

• Abstracts: Test of synergistic interactions among deleterious mutations in bacteria. A viable herd of genetically uniform cattle: Deleterious alleles seem to have been purged in a feral strain of inbred cows
• Abstracts: Effects of nutrient deficiencies and excesses on reproductive efficiency of livestock. Research applications of ultrasonic imaging in reproductive biology
• Abstracts: Ridge segmentation, faulting and crustal thickness in the Atlantic Ocean. Palaeomagnetic evidence for large-magnitude, low-angle normal faulting in a metamorphic core complex
• Abstracts: Technical note: utilization of sainfoin by grazing steers and a method for predicting daily gain from small-plot grazing data
• Abstracts: Running rings around modellers. The structure and dynamics of Jupiter's ring

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.