Direct observation of the magnetic anisotropy of an Fe(II) spin crossover molecular thin film

IF 2.9 4区 物理与天体物理 Q2 OPTICS Journal of Nonlinear Optical Physics & Materials Pub Date : 2023-07-01 DOI:10.1088/2515-7639/ace21a
Ashley S. Dale, Saeed Yazdani, T. K. Ekanayaka, Esha Mishra, Yuchen Hu, P. Dowben, J. Freeland, Jian Zhang, R. Cheng
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Abstract

In this work, we provide clear evidence of magnetic anisotropy in the local orbital moment of a molecular thin film based on the SCO complex [Fe(H2B(pz)2)2(bipy)] (pz = pyrazol−1−yl, bipy = 2,2′−bipyridine). Field dependent x-ray magnetic circular dichroism measurements indicate that the magnetic easy axis for the orbital moment is along the surface normal direction. Along with the presence of a critical field, our observation points to the existence of an anisotropic energy barrier in the high-spin state. The estimated nonzero coupling constant of ∼2.47 × 10−5 eV molecule−1 indicates that the observed magnetocrystalline anisotropy is mostly due to spin–orbit coupling. The spin- and orbital-component anisotropies are determined to be 30.9 and 5.04 meV molecule−1, respectively. Furthermore, the estimated g factor in the range of 2.2–2.45 is consistent with the expected values. This work has paved the way for an understanding of the spin-state-switching mechanism in the presence of magnetic perturbations.
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Fe(II)自旋交叉分子薄膜磁各向异性的直接观察
在这项工作中,我们提供了基于SCO配合物[Fe(H2B(pz)2)2(bipy)]的分子薄膜的局部轨道矩磁各向异性的明确证据(pz = pyrazol−1−yl, bipy = 2,2 '−联吡啶)。磁场相关的x射线磁圆二色性测量表明,轨道矩的磁易轴沿表面法线方向。随着临界场的存在,我们的观测表明在高自旋态中存在各向异性能量势垒。估计的~ 2.47 × 10−5 eV分子−1的非零耦合常数表明,观察到的磁晶各向异性主要是由于自旋-轨道耦合。自旋和轨道各向异性分别为30.9和5.04 meV分子−1。此外,估计的g因子在2.2-2.45范围内与期望值一致。这项工作为理解磁扰动存在下的自旋状态切换机制铺平了道路。
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来源期刊
CiteScore
3.00
自引率
48.10%
发文量
53
审稿时长
3 months
期刊介绍: This journal is devoted to the rapidly advancing research and development in the field of nonlinear interactions of light with matter. Topics of interest include, but are not limited to, nonlinear optical materials, metamaterials and plasmonics, nano-photonic structures, stimulated scatterings, harmonic generations, wave mixing, real time holography, guided waves and solitons, bistabilities, instabilities and nonlinear dynamics, and their applications in laser and coherent lightwave amplification, guiding, switching, modulation, communication and information processing. Original papers, comprehensive reviews and rapid communications reporting original theories and observations are sought for in these and related areas. This journal will also publish proceedings of important international meetings and workshops. It is intended for graduate students, scientists and researchers in academic, industrial and government research institutions.
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