Abstract
By using the generalized perturbation method within the screened Korringa-Kohn-Rostoker formalism we calculate magnetic exchange interactions in the helimagnetic bulk compound upon alloying Mn with Fe and Cr. The obtained interactions reproduce well the results of neutron diffraction experiments concerning the periodicity of the helix in and its weakening with Fe substitution thus supporting the conventional interpretation of a metamagnet-ferromagnet transitions due to external fields. In the case of alloys our results reveal that the experimentally observed magnetization process follows a completely different scenario, predicted theoretically a few decades ago for nearly orthogonal helimagnetics.
- Received 12 December 2005
DOI:https://doi.org/10.1103/PhysRevB.73.104446
©2006 American Physical Society