Abstract
Tetragonal Mn-based Heusler compounds feature rich exchange interactions and exotic topological magnetic textures, such as antiskyrmions, complimented by the chiral-type Hall effects. This makes the material class interesting for device applications. We report the relation of the magnetic exchange interactions to the thickness and Mn concentration of Mn$_{x}$PtSn films, grown by magnetron sputtering. The competition of the magnetic exchange interactions determines the finite temperature magnetic texture and thereby the chiral-type Hall effects in external magnetic fields. We investigate the magnetic and transport properties as a function of magnetic field and temperature. We focus on the anomalous and chiral-type Hall effects and the behavior of the dc-magnetization, in relation to chiral spin textures. We further determine the stable crystal phase for a relative Mn concentration between 1.5 and 1.85 in the $I\overline{4}2d$ structure. We observe a spin-reorientation transition in all compounds studied, which is due to the competition of exchange interactions on different Mn sublattices. We discuss our results in terms of exchange interactions and compare them with theoretical atomistic spin calculations.
Highlights
Magnetic spin textures are of vital interest for technological applications due to the ease of manipulation via external electromagnetic fields[1−3] and detection purely through electrical means.[4]
There are transport effects that are independent of the external magnetic field and net magnetization, which we group into the chiral-type Hall effects.[6−9] These chiral-type Hall effects are experimentally determined by the subtraction of the AHE and OHE from the total Hall effect[10] and are related to the spatial variation of the local magnetic lattice in real space.[4]
We reported the crystal structure of inverse tetragonal Mn1.5PtSn thin films derived from the I4̅2d bulk structure
Summary
Magnetic spin textures are of vital interest for technological applications due to the ease of manipulation via external electromagnetic fields[1−3] and detection purely through electrical means.[4]. The well-known ordinary (OHE) and anomalous (AHE) Hall effects scale with the external magnetic field and the alignment of magnetic domains in the absence of a magnetic field, respectively.[5] In addition, there are transport effects that are independent of the external magnetic field and net magnetization, which we group into the chiral-type Hall effects.[6−9] These chiral-type Hall effects are experimentally determined by the subtraction of the AHE and OHE from the total Hall effect[10] and are related to the spatial variation of the local magnetic lattice in real space.[4] The relative spatial variation gives rise to an emergent electromagnetic field, termed the Berry curvature, which is finite for localized magnetic textures with spin chirality. Electromagnetic fields couple to these spin textures through the conduction electrons and, in turn, the ground-state electronic properties.[11]
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