Unconventional thickness scaling of coherent tunnel magnetoresistance in altermagnets

作者：Zongmeng Yang, Xingyue Yang, Jianhua Wang, Qiang Li, Rui Peng, Ching Hua Lee, L. K. Ang, Jing Lu, Yee Sin Ang, Shibo Fang · 发表于：Physical review. B./Physical review. B · 年份：2025 · DOI：10.1103/2thy-fzzj · 被引用次数：13 · 研究领域：Magnetic properties of thin films、Quantum and electron transport phenomena、Chemical and Physical Properties of Materials

In conventional ferromagnetic tunnel junctions, the tunnel magnetoresistance (TMR) typically increases with increasing barrier thickness under ballistic tunneling conditions. In contrast, the authors reveal here unconventional scaling behavior in altermagnetic tunnel junctions, where the TMR decreases as the barrier becomes thicker. This trend originates from spin-degenerate transmission channels inherent to altermagnets, which effectively suppress the increase of TMR with increasing barrier thickness.