Bhattacharya, N and Middey, S (2022) Non-uniform magnetization profile in ferromagnetic heterostructures leading to topological Hall effect like signatures. In: Journal of Magnetism and Magnetic Materials, 549 .
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Abstract
Anomalous Hall effect (AHE), which arises when a current is passed through a ferromagnetic material subjected to a perpendicular magnetic field, is proportional to the magnetization of the sample. Additional hump-like features in AHE are often attributed to the presence of non-trivial spin textures leading to topological Hall effect (THE). However, several recent reports have emphasized in context of ferromagnetic SrRuO3 based heterostructures that the sample inhomogeneity can also result in THE-like features. In order to investigate this issue in general for any ferromagnetic heterostructure, we have considered a phenomenological model to calculate the changes in the shape of hysteresis loop due to various interfacial effects. These changes in the magnetization have been accounted for by considering that the interdomain magnetic coupling parameter (α) varies exponentially with the distance from the interface along the growth direction of the heterostructure. In case of symmetric interfaces on both sides of a ferromagnet, we have considered the variation of α as a Gaussian function. We have found that the additional AHE contribution due to the net change in magnetization in such cases are akin to experimentally observed THE, even though we have not considered any topological quantity explicitly in our model. Thus, we propose another situation with nonuniform magnetization profile that may be used to explain additional features in AHE, which might not necessarily be intrinsic THE. © 2022 Elsevier B.V.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Magnetism and Magnetic Materials |
| Publisher: | Elsevier B.V. |
| Additional Information: | The copyright for this article belongs to Authors |
| Keywords: | Ferromagnetic materials; Ferromagnetism; Hall effect; Ruthenium compounds; Strontium compounds; Textures; Topology, 'current; Anomalous hall effects; In contexts; Interfacial effects; Magnetization profile; Non-trivial; Non-uniform magnetizations; Perpendicular magnetic fields; Spin textures; Topological hall effect, Magnetization |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 08 Feb 2022 10:24 |
| Last Modified: | 08 Feb 2022 10:24 |
| URI: | http://eprints.iisc.ac.in/id/eprint/71223 |
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