A1 Journal article (refereed), original research

Anomalous Hall effect in Ni47.3Mn30.6Ga22.1/MgO(001) thin films


Open Access publication

LUT Authors / Editors

Publication Details
Authors: Blinov M.I., Chernenko V., Prudnikov V.N., Aseguinolaza I.R., Barandiaran J.M., Lähderanta E., Granovsky A.B.
Publisher: American Physical Society
Publication year: 2020
Language: English
Related Journal or Series Information: Physical Review B
Volume number: 102
Issue number: 6
ISSN: 2469-9950
eISSN: 2469-9969
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2020090367348

Abstract

We investigate the temperature dependences of the magnetic properties, electrical resistivity, magnetoresistance, and Hall effect resistivity, ρH(H), in thin films of the Heusler-type Ni47.3Mn30.6Ga22.1 (at.%) magnetic shape memory alloys epitaxially grown onto a MgO(001) substrate. The results reveal martensitic transformation at about 230 K, premartensitic transition around 285 K, and the Curie temperature of austenite around 380 K. We obtained the coefficients of normal Hall effect (NHE), R0, and anomalous Hall effect (AHE), Rs, by fitting the total Hall resistivity curves ρH=R0Bz+4πRsMz in several magnetic field ranges (0.1–1, 0–5, 8–16, and 0–16 kOe), using experimental magnetization data. Both coefficients R0 and Rs strongly depend on the magnetic field. We also fit the Hall effect resistivity with the expression ρH=R0Bz+4πRsMz+ΔρH using the coefficients R0 and Rs obtained from the high-field interval (8–16 kOe), where the last term, ΔρH, was considered to correspond either to the topological Hall effect or to the antiferromagnetic Hall effect. The obtained temperature dependence and magnitude of ΔρH discard the presence of the skyrmions or antiskyrmions. We conclude that unconventional field dependences of the NHE and AHE coefficients are produced by the antiferromagnetic correlations and the influence of the magnetic field on the electronic structure.


Last updated on 2020-29-09 at 11:10