Evolution of diverse Hall effects during the successive magnetic phase transitions in Mn2.5Fe0.6Sn0.9 Kagome-lattice alloy

Z H Liu; Q Q Zhang; Y J Zhang; H G Zhang; X Q Ma; E K Liu

doi:10.1088/1361-648X/abd337

Evolution of diverse Hall effects during the successive magnetic phase transitions in Mn_2.5Fe_0.6Sn_0.9 Kagome-lattice alloy

J Phys Condens Matter. 2021 Mar 17;33(11):115803. doi: 10.1088/1361-648X/abd337.

Authors

Z H Liu¹, Q Q Zhang¹, Y J Zhang¹, H G Zhang², X Q Ma¹, E K Liu^{3

4}

Affiliations

¹ Department of Physics, Beijing Engineering Research Center of Detection and Application for Weak Magnetic Field, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
² College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, People's Republic of China.
³ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
⁴ Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China.

PMID: 33316787
DOI: 10.1088/1361-648X/abd337

Abstract

Evolution of diverse Hall effects due to successive magnetic transitions has been observed in Mn_2.5Fe_0.6Sn_0.9 by suitable chemical substitution of Fe in Mn_3.1Sn_0.9. This noncollinear antiferromagnetic alloy exhibits a Neel temperature of 325 K. Upon cooling from 325 K, a magnetic phase transition from noncollinear antiferromagnetism to ferromagnetism occurs at 168 K due to the tilting of magnetization towards c axis. Above this temperature, anomalous Hall resistivity ranged from 0.6 to 1.3 μΩ cm has been observed in noncollinear antiferromagnetic state. Below this temperature, a topological Hall effect (THE) starts to appear due to the non-vanishing scalar spin chirality arising from the noncoplanar spin structure. Further decreasing temperature to 132 K, another magnetic transition happens, resulting in the coexistence of ferromagnetism and antiferromagnetism, so that a Hall plateau with large hysteresis below 70 K is yielded. A hysteresis as high as ∼80 kOe is obtained in ρ _xy -H at 15 K. However, the Hall plateau disappears and only anomalous Hall effect (AHE) persists when further decreasing the temperature to 5 K. The present study provides a picture of diverse magneto-transport properties correlated to the variable spin structures driven by magnetic phase transitions.