Onset of a skyrmion phase by chemical substitution in MnGe-based chiral magnets

Authors:
E. Altynbaev, N. Martin, A. Heinemann, L. Fomicheva, A. Tsvyashchenko, I. Mirebeau, and S. Grigoriev
The year of the publication:
2020
Journal:
Physical Review B N 101 100404(R)
Abstract:

We study the evolution of the magnetic phase diagram of Mn 1 − x Fe x Ge alloys with concentration x ( 0 ≤ x ≤ 0.3 ) by small-angle neutron scattering. We unambiguously observe the absence of a skyrmion (Sk) lattice (or A phase) in bulk MnGe and its onset under a small Mn/Fe substitution. The A phase is there endowed with extremely small Sks, potentially resulting in a high density, and is stabilized within a very large temperature region and a field range which scales with the Fe concentration. Our findings highlight the possibility to fine tune the properties of skyrmion lattices by means of chemical doping.

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