Observation of giant room-temperature anisotropic magnetoresistance in the topological insulator β-Ag2Te

Wei Ai, Fuyang Chen, Zhaochao Liu, Xixi Yuan, Lei Zhang, Yuyu He, Xinyue Dong, Huixia Fu (), Feng Luo (), Mingxun Deng (), Ruiqiang Wang and Jinxiong Wu ()
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Wei Ai: Nankai University
Fuyang Chen: South China Normal University
Zhaochao Liu: Nankai University
Xixi Yuan: Chongqing University
Lei Zhang: Nankai University
Yuyu He: Nankai University
Xinyue Dong: Nankai University
Huixia Fu: Chongqing University
Feng Luo: Nankai University
Mingxun Deng: South China Normal University
Ruiqiang Wang: South China Normal University
Jinxiong Wu: Nankai University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Achieving room-temperature high anisotropic magnetoresistance ratios is highly desirable for magnetic sensors with scaled supply voltages and high sensitivities. However, the ratios in heterojunction-free thin films are currently limited to only a few percent at room temperature. Here, we observe a high anisotropic magnetoresistance ratio of −39% and a giant planar Hall effect (520 μΩ⋅cm) at room temperature under 9 T in β-Ag2Te crystals grown by chemical vapor deposition. We propose a theoretical model of anisotropic scattering — induced by a Dirac cone tilt and modulated by intrinsic properties of effective mass and sound velocity — as a possible origin. Moreover, small-size angle sensors with a Wheatstone bridge configuration were fabricated using the synthesized β-Ag2Te crystals. The sensors exhibited high output response (240 mV/V), high angle sensitivity (4.2 mV/V/°) and small angle error (

Date: 2024
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DOI: 10.1038/s41467-024-45643-y

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