Controlling Chiral Spin States of a Triangular‐Lattice Magnet by Cooling in a Magnetic Field. (9th July 2019)

• Record Type: Journal Article
• Authors: Deng, Sihao; Fischer, Gerda; Uhlarz, Marc; Wosnitza, Joachim; Bohnen, Klaus‐Peter; Heid, Rolf; Wang, Cong; Sürgers, Christoph
• Is Part Of: Advanced functional materials. Volume 29:Number 37(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-07-09
• Subjects: antiperovskites -- chiral spintronics -- Hall resistivity -- magnetization -- magnetoresistivity -- scalar spin chirality; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201900947
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Magnetic materials with a non‐collinear and non‐coplanar arrangement of magnetic moments hosting a nonzero scalar spin‐chirality exhibit unique magnetic and spin‐dependent electronic transport properties. The spin chirality often occurs in materials where competing exchange interactions lead to geometrical frustrations between magnetic moments and to a strong coupling between the crystal lattice and the magnetic structure. These characteristics are particularly strong in Mn‐based antiperovskites where the interactions and chirality can be tuned by substitutional modifications of the crystalline lattice. This study presents evidence for the formation of two unequal chiral spin states in magnetically ordered Mn3.338 Ni0.651 N antiperovskite based on density functional theory calculations and supported by magnetization measurements after cooling in a magnetic field. The existence of two scalar spin‐chiralities of opposite sign and different magnitude is demonstrated by a vertical shift of the magnetic‐field dependent magnetization and Hall effect at low fields and from an asymmetrical magnetoresistivity when the applied magnetic field is oriented parallel or antiparallel to the direction of the cooling field. This opens up the possibility of manipulating the spin chirality for potential use in the emerging field of chiral spintronics. Abstract : Two unequal chiral spin states of a triangular‐lattice magnet Mn3.338 Ni0.651 N can be achieved by cooling in a positive or negative magnetic field. The different scalar spin‐chirality gives rise to a vertical shift of the magnetization and Hall effect at low fields and to an asymmetrical magnetoresistivity, which can be of potential use in the emerging field of chiral spintronics.