Research Papers in Physics and Astronomy


Date of this Version



Published Applied Physics Letters 79 (2001) 3122-3124. Permission to use.


From magnetic circular dichroism measurements of the Heusler alloy NiMnSb, in combination with other techniques, we show that a dramatic increase in the Mn and Ni moments occurs below a ‘‘crossover’’ transition temperature of about 80–100 K. This phase transition is well below the Curie temperature of NiMnSb (~730 K). While the spin polarization near the Fermi level, from spin-polarized inverse photoemission, remains very high for kII50, it is unlikely that NiMnSb is a half-metallic ferromagnet near room temperature.

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