Study of the effect of disorder on the local magnetism in Heusler alloys

A local study of the influence of annealing temperature that can provoke structural defects and chemical disorder on the magnetism of Heusler alloys has been carried out by measuring hyperfine interactions in Pd 2 Mn Z ( Z = Ge , In, Sn, and Sb). Perturbed angular correlation method has been used to...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2006-04, Vol.99 (8), p.08J104-08J104-3
Main Authors: Carbonari, A. W., Saxena, R. N., Mestnik-Filho, J., Cabrera-Pasca, G. A., Rao, M. N., Oliveira, J. R. B., Rizzuto, M. A.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A local study of the influence of annealing temperature that can provoke structural defects and chemical disorder on the magnetism of Heusler alloys has been carried out by measuring hyperfine interactions in Pd 2 Mn Z ( Z = Ge , In, Sn, and Sb). Perturbed angular correlation method has been used to measure the hyperfine fields at Cd 111 probe nuclei substituting the Mn and Z sites as a function of temperature. The fraction of In 111 -nuclei-occupying Mn sites was found to increase with the annealing of sample at higher temperatures followed by quenching that can leave the alloy in a disordered state. As a consequence, it was possible to observe the effect of temperature in the ordering of the alloys. Moreover, electric quadrupole interaction measurements clearly indicated chemical disorder after quenching in Pd 2 Mn Sn and an improvement in the ordering of the Pd 2 Mn Ge structure at high temperatures.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2172222