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Defects-driven appearance of half-metallic ferrimagnetism in Co–Mn-based Heusler alloys
Ist Teil von
Solid state communications, 2007-06, Vol.142 (9), p.492-497
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2007
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Half-metallic ferromagnetic full-Heusler alloys containing Co and Mn, having the formula Co
2MnZ where Z is a sp element, are among the most studied Heusler alloys due to their stable ferromagnetism and the high Curie temperatures which they present. Using state-of-the-art electronic structure calculations we show that when Mn atoms migrate to sites occupied in the perfect alloys by Co, these Mn atoms have spin moments antiparallel to the other transition metal atoms. The ferrimagnetic compounds, which result from this procedure, keep the half-metallic character of the parent compounds and the large exchange-splitting of the Mn impurities atoms only marginally affects the width of the gap in the minority-spin band. The case of [Co
1−
x
Mn
x
]
2MnSi is of particular interest since Mn
3Si is known to crystallize in the Heusler
L
2
1
lattice structure of Co
2MnZ compounds. Robust half-metallic ferrimagnets are highly desirable for realistic applications since they lead to smaller energy losses due to the lower external magnetic fields created with respect to their ferromagnetic counterparts.