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Title: Tunable magnetic helicity in Mn{sub 1−x}Fe{sub x}Ge: A Monte Carlo simulation

Motivated by recent experiments on B20 compound Mn{sub 1−x}Fe{sub x}Ge, we explore the variations of spin structures and magnetic helicity γ{sub m} in Mn{sub 1−x}Fe{sub x}Ge as a function of concentration x, using Monte Carlo simulation. We propose a simple spin model including hybrid Dzyaloshinskii-Moriya (DM) interactions with different signs in FeGe and MnGe. The results reveal a series of spin structures with helicity γ{sub m} varying continuously from negative values to positive values upon decreasing x (0.0 ≤ x ≤ 1.0). The simulated x-dependence of the spin structures is consistent with experimental observations, suggesting the validity of the present hybrid model. This study sheds light on control of magnetic helicity in helimagnets, by mixing crystals with different DM interactions.
Authors:
; ; ;  [1]
  1. Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22410047
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPUTERIZED SIMULATION; CONCENTRATION RATIO; CRYSTALS; GERMANIDES; HELICITY; IRON COMPOUNDS; MANGANESE COMPOUNDS; MONTE CARLO METHOD; SPIN; VARIATIONS; VISIBLE RADIATION