Hunan Provincial Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China.
School of Physics and Electronics, Hunan University, Changsha, 410082, P. R. China.
Adv Mater. 2023 Apr;35(16):e2210755. doi: 10.1002/adma.202210755. Epub 2023 Mar 12.
Antiferromagnets with noncollinear spin order are expected to exhibit unconventional electromagnetic response, such as spin Hall effects, chiral abnormal, quantum Hall effect, and topological Hall effect. Here, 2D thickness-controlled and high-quality Cr Si nanosheets that are compatible with the complementary metal-oxide-semiconductor technology are synthesized by chemical vapor deposition method. The angular dependence of electromagnetic transport properties of Cr Si nanosheets is investigated using a physical property measurement system, and an obvious topological Hall effect (THE) appears at a large tilted magnetic field, which results from the noncollinear magnetic structure of the Cr Si nanosheet. The Cr Si nanosheets exhibit distinct thickness-dependent perpendicular magnetic anisotropy (PMA), and the THE only emerges in the specific thickness range with moderate PMA. This work provides opportunities for exploring fundamental spin-related physical mechanisms of noncollinear antiferromagnet in ultrathin limit.
反铁磁体具有非共线自旋序，预计会表现出非常规的电磁响应，如自旋霍尔效应、手性反常、量子霍尔效应和拓扑霍尔效应。在此，通过化学气相沉积法合成了 2D 厚度可控且与互补金属氧化物半导体技术兼容的高质量 CrSi 纳米片。使用物理性质测量系统研究了 CrSi 纳米片的电磁输运性质的角依赖性，在大倾斜磁场下出现了明显的拓扑霍尔效应（THE），这是由于 CrSi 纳米片的非共线磁结构所致。CrSi 纳米片表现出明显的厚度相关垂直各向异性（PMA），并且只有在具有适度 PMA 的特定厚度范围内才会出现 THE。这项工作为探索非共线反铁磁体在超薄极限下的基本自旋相关物理机制提供了机会。
