Self-Assembly Design of a Robust 2D Frustrated Magnet with Bilayer Tetragonal Spin–Lattice

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2025-02-07 DOI:10.1021/acs.nanolett.4c05397

Jianpei Xing, Bo Zhao, Jinchao Kang, Yan Qi, Qinxi Liu, Xue Jiang, Jijun Zhao

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Abstract

We intentionally designed a stable two-dimensional (2D) bilayer dimer system, OsFeP₄, which serves as a tunable spin-5/2 J₁-J₂ anisotropic Heisenberg-like model to investigate frustrated magnetism. The frustrated state of 2D OsFeP₄ originates from the robust intradimer ferromagnetic (FM) exchange coupling (J_⊥) and a subtle competition between P₄ molecules mediating interdimer ferromagnetic (J_∥) and antiferromagnetic (AFM) exchange coupling (J_×). This is further supported by a significant broadening of the specific heat peak, a high frustration factor (θ_CW/T_N) of 4.17, the peak at the gamma point in the static structural factor, and short-range spin textures. Moreover, we employ strain to modulate the frustration parameter J_×/J_∥ from 0.23 to 0.4 and spin direction from in-plane to out-of-plane. The FM, AFM, and frustrated phase transitions are identified in the J_⊥–J_×–J_∥ ternary phase diagram. This work will enrich our understanding of the frustration mechanisms in the 2D limit.

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具有双层四方自旋晶格的坚固二维受挫磁体的自组装设计

我们有意设计了一个稳定的二维（2D）双层二聚体体系OsFeP4，作为一个可调的自旋5/2 J1-J2各向异性海森堡模型来研究受挫磁。2D OsFeP4的受挫状态源于强大的内二聚体铁磁（FM）交换偶联（J⊥）和P4分子之间介导的中间二聚体铁磁（J∥）和反铁磁（AFM）交换偶联（jx）之间的微妙竞争。比热峰明显变宽，挫折系数（θCW/TN）为4.17，静态结构因子中伽玛点处的峰值和近距离自旋织构进一步支持了这一点。此外，我们利用应变将挫折参数jx /J∥从0.23调节到0.4，并将自旋方向从面内调节到面外。FM， AFM和挫折相变在J⊥-J×-J∥三元相图中被识别。这项工作将丰富我们对二维极限受挫机制的理解。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.