Inhomogeneous transition from the ferromagnetic state to the antiferromagnetic state in Mn5(Ge1-xSix)3alloys: an NMR study
Year: 1984
Type: article
Abstract: From a thorough NMR study of the 55 Mn hyperfine field distribution in Mn 5 (Ge 1-x Si x ) 3 alloys the authors shown that the transition from the ferromagnetic Mn 5 Ge 3 to the antiferromagnetic Mn 5 Si 3 occurs inhomogeneously in three steps. At the early stage of the substitution of Si for Ge (x<or=0.4) the moment of some Mn atoms nearly vanishes when a critical number ( approximately 2) of Si atoms is reached in their neighbourhood; at this stage such Mn atoms recover their full moment when a low external field is applied announcing at a local scale the metamagnetic transition observed for x>or approximately=0.8. Then for 0.5<or=x<or=0.8 antiferromagnetic domains build up in the samples and ferromagnetic domains progressively shrink with increasing Si content; this is associated with a strong change of the magnetic domain walls behaviour. Finally for x>or=0.8 bulk antiferromagnetism occurs but a metamagnetic transition is still observed for H ext >30 kOe.
Authors: P Panissod, A Qachaou, G Kappel
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2000681677