Giant impurity effect on anomalous Hall effect of Mn3Sn

Rikizo Yano; Shunya Kihara; Masayasu Yoneda; Huyen Thi Ngoc Vu; Hiroyuki Suto; Naoyuki Katayama; Takeo Yamaguchi; Makoto Kuwahara; Michi-To Suzuki; Koh Saitoh; Satoshi Kashiwaya

doi:10.1063/5.0195211

Giant impurity effect on anomalous Hall effect of Mn3Sn

J Chem Phys. 2024 May 14;160(18):184708. doi: 10.1063/5.0195211.

Authors

Rikizo Yano¹, Shunya Kihara¹, Masayasu Yoneda¹, Huyen Thi Ngoc Vu², Hiroyuki Suto³, Naoyuki Katayama¹, Takeo Yamaguchi⁴, Makoto Kuwahara^{1

5}, Michi-To Suzuki^{2

6}, Koh Saitoh^{1

5}, Satoshi Kashiwaya¹

Affiliations

¹ Department of Applied Physics, Nagoya University, Nagoya, Aichi 464-8603, Japan.
² Center for Computational Materials Science, Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan.
³ Advanced Material Engineering Division, TOYOTA Motor Corporation, Susono, Shizuoka 410-1193, Japan.
⁴ Advanced Data Science Management Division, TOYOTA Motor Corporation, Chiyoda-ku, Tokyo 100-0004, Japan.
⁵ Institute of Materials and Systems for Sustainability, Nagoya University, Aichi 464-8601, Japan.
⁶ Center for Spintronics Research Network, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.

PMID: 38738607
DOI: 10.1063/5.0195211

Abstract

Mn3Sn is an anomalous Hall effect (AHE) antiferromagnet that exhibits the hysteretic AHE in antiferromagnetic (AFM) phase at room temperature. We report that whisker Mn3Sn crystals grown by the flux method exhibit a non-hysteretic AHE at mid-to-low temperatures when the whisker Mn3Sn is surrounded by a thin layer of ferromagnetic Mn2-xSn. These crystals exhibit a hysteretic AHE above 275 K due to the spin alignment of the inverse triangular lattice, which is similar to other crystals. However, upon cooling the crystal, it exhibits a non-hysteretic AHE with a spiral AFM spin structure at 100-200 K. We concluded that the non-hysteretic AHE is induced at the interface of Mn2-xSn/Mn3Sn. We believe that the scalar-spin chirality in the spiral AFM phase of Mn3Sn, modulated by Mn2-xSn through the magnetic proximity effect, produces the AHE. This discovery opens a new avenue for tailoring the AHE by magnetic layers.