Giant Piezospintronic Effect in a Noncollinear Antiferromagnetic Metal
Huixin Guo, Zexin Feng, Han Yan, Jiuzhao Liu, Jia Zhang, Xiaorong Zhou, Peixin Qin, Jialin Cai, Zhongming Zeng, Xin Zhang, Xiaoning Wang, Hongyu Chen, Haojiang Wu, Chengbao Jiang, Zhiqi Liu
Abstract
Abstract One of the main bottleneck issues for room‐temperature antiferromagnetic spintronic devices is the small signal read‐out owing to the limited anisotropic magnetoresistance in antiferromagnets. However, this could be overcome by either utilizing the Berry‐curvature‐induced anomalous Hall resistance in noncollinear antiferromagnets or establishing tunnel‐junction devices based on effective manipulation of antiferromagnetic spins. In this work, the giant piezoelectric strain modulation of the spin structure and the anomalous Hall resistance in a noncollinear antiferromagnetic metal— D 0 19 hexagonal Mn 3 Ga—is demonstrated. Furthermore, tunnel‐junction devices are built with a diameter of 200 nm to amplify the maximum tunneling resistance ratio to more than 10% at room‐temperature, which thus implies significant potential of noncollinear antiferromagnets for large signal‐output and high‐density antiferromagnetic spintronic device applications.